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What is the Oldest Unsolved Math Problem?

evilquaker asks: "After finding a reference to the (still open) odd perfect number problem, which is claimed to date back to Euclid, I wondered: what are the oldest unsolved math problems? The folklore answer is that the odd perfect number problem is the only one posed by the Greeks which is still open. However, it seems there is some doubt as to whether Euclid actually wondered about odd perfect numbers. Further, there's a claim that the twin primes conjecture dates back to the Greeks. So what's the oldest documented still-open math problem? Perhaps something about Fibonacci numbers?"

73 comments

  1. The oldest unsolved math problem... by anthony_dipierro · · Score: 2, Troll
    1. Re:The oldest unsolved math problem... by Da+Schmiz · · Score: 2

      Whoever modded you "Troll" is probably right. Oh well, I'll bite anyway.

      If we're talking about the Jewish/Christian God (as your link seems to imply), it's a well-known fact that his name is spelled "Yohdh He' Waw He'", commonly transliterated into English as "Yahweh" or "Jehovah". This is not exactly a hidden secret.

      I'm not aware of any Jewish beliefs about a 216-letter name, or even anything close to the mystical powers described in the link you gave. Methinks this is either an obscure cabbalistic fiction or the sheer invention of the screenplay writer.

      Oh, and to debunk the "numerology of the Torah" stuff once and for all: although the overall message of the Hebrew Scriptures has stayed intact (the Dead Sea Scrolls, among others, verify the accuracy of the Masoretic text), the actual spelling of various words, the number of letters used, and in some cases even the exact choice of words all vary from manuscript to manuscript.

      This stuff is not scientific in any sense of the word, and certainly not up to the rigors of mathematical proof.

      Okay, I'll stop there... I don't want to go too far off-topic...

      --

      "Anything is better than IE, and you can quote me on that." -- Wil Wheaton.

    2. Re:The oldest unsolved math problem... by dodald · · Score: 2, Interesting

      Do you pronounce "Yohdh" "Yoda" by any chance?

      --
      101010b 2Ah 52o
    3. Re:The oldest unsolved math problem... by satanami69 · · Score: 1, Flamebait

      "Do you pronounce "Yohdh" "Yoda" by any chance?"

      Only if you're an idiot.

      --
      I really hate Dan Patrick.
    4. Re:The oldest unsolved math problem... by macdaddy357 · · Score: 1

      How about a useful problem. Since hot dogs come in packs of ten, and buns in packs of eight or twelve, how many of each do you need to buy to make them all match up? Now that's a mystery.

      --
      How ya like dat?
    5. Re:The oldest unsolved math problem... by anthony_dipierro · · Score: 2

      Whoever modded you "Troll" is probably right.

      I wasn't being serious. If you haven't seen the movie (about a paranoid schizophrenic who believed in all this crap), you won't get the joke.

      What is the oldest unsolved math problem? I'm not about to dignify such a stupid question with a serious answer.

    6. Re:The oldest unsolved math problem... by evilquaker · · Score: 1
      What is the oldest unsolved math problem? I'm not about to dignify such a stupid question with a serious answer.

      Why exactly is it a stupid question?

      --
      To within half a percent, pi seconds is a nanocentury. -- Tom Duff
    7. Re:The oldest unsolved math problem... by Chacham · · Score: 1

      I'm not aware of any Jewish beliefs about a 216-letter name,

      Jewish tradition uses names to refer to specific abilities, ways of reacting with the world, or attribute that the addresser is trying to manipulate.

      As such, there are numerous names, of many lengths. While, I personally do not remember hearing of a 216 letter name, it would not suprise me if there was one.

      or even anything close to the mystical powers described in the link you gave.

      The movie was pathetic. I know some people liked it, but I consider it a waste of time. Almost everything they mentioned was some dream of the authors crazy imagination.

      Methinks this is either an obscure cabbalistic fiction

      You mean fictional cabbalah? Cabbalah itself, by definition ( the word literally means "acceptence" referecing traditions accepted) cannot be fictional.

    8. Re:The oldest unsolved math problem... by anthony_dipierro · · Score: 1

      Why exactly is it a stupid question?

      Maybe silly is a better word than stupid. It's silly because it's an arbitrary meaningless question which we almost surely won't even find the answer to.

    9. Re:The oldest unsolved math problem... by anthony_dipierro · · Score: 1

      The movie was pathetic. I know some people liked it, but I consider it a waste of time. Almost everything they mentioned was some dream of the authors crazy imagination.

      I think that was the point, considering that the character clearly suffered from paranoid schizophrenia. Most of it wasn't supposed to be actually happening.

    10. Re:The oldest unsolved math problem... by evilquaker · · Score: 1
      It's silly because it's an arbitrary meaningless question which we almost surely won't even find the answer to.

      IOW, a perfect question for Slashdot...

      --
      To within half a percent, pi seconds is a nanocentury. -- Tom Duff
  2. sci.math by SpatchMonkey · · Score: 5, Informative

    This question has already been debated quite extensively in the newsgroup sci.math.

    It's quite an interesting read!

  3. Hard to say since Library of Alexendria burned by GuyMannDude · · Score: 5, Informative

    I know you are asking for the oldest documented math problem, but do remember that the Great Library of Alexandria was burned down by an angry mob. That library housed most of the world's knowledge up until that point. So documentation of any super-old problem was probably destroyed in the fire.

    By the way, a search on google for "oldest unsolved math problem" comes up with this page which states

    PROOF OF THE INFINITUDE OF PERFECT NUMBERS (IPN). The IPN is either the second oldest, or the oldest unsolved problem of mathematics (debatable with the No Odd Perfect Number Problem), and this proof will easily evince anyone why it is one of the two oldest unsolved math problems.

    So I guess the IPN is a contender.

    GMD

    1. Re:Hard to say since Library of Alexendria burned by Anonymous Coward · · Score: 0

      1) The library wasn't burned by an angry mob, it was burned accidently, by Caeser's army, when some of their missiles (launched from boats) went astray.

      2) Most written documentation on the "great library" suggests it wasn't a library like LoC, but more like a collection of erotic art and poems.

  4. Documented? by fm6 · · Score: 1, Flamebait
    So what's the oldest documented still-open math problem?
    What?! You're only interested in verifiable information????!!!! Fascist!
  5. uh, /hello/. by Anonymous Coward · · Score: 0

    the fibonacci series don't date back very far...only to about fibonacci. (before then, you couldn't have raised a question about fibonacci numbers, because nobody noticed/described a function for them....)

    1. Re:uh, /hello/. by tunah · · Score: 2
      Did fibonacci actually have the function? He observed some nice things about the pattern and that it result ed from one model of rabbit breeding.

      For those interested, the function is:
      [ (1 + sqrt(5))^n - (1 - sqrt(5))^n ]/[sqrt(5)*2^n]

      --
      Free Java games for your phone: Tontie, Sokoban
    2. Re:uh, /hello/. by evilquaker · · Score: 1
      the fibonacci series don't date back very far...only to about fibonacci.

      Fibonacci died in 1250... well before the Renaissance started. The Fibonacci numbers represent the only novel mathematics I can think of that was done in the middle ages. Everything else seems to come from the Renaissance or the Greeks.

      --
      To within half a percent, pi seconds is a nanocentury. -- Tom Duff
    3. Re:uh, /hello/. by jstarr · · Score: 2, Informative

      You're forgetting the Arabs. If you want something truly novel, try trigonometry. The entire concept, sine*, cosine, tangent, etc., was invented during the Middle Ages (by Arabs like Abu al-Wafa and Abu Nasr Mansur).

      * The Hindus knew about sine, but they didn't understand it very well and certainly didn't extend the notion to the other sides of the triangle.

    4. Re:uh, /hello/. by cperciva · · Score: 2

      The entire concept, sine*, cosine, tangent, etc., was invented during the Middle Ages (by Arabs like Abu al-Wafa and Abu Nasr Mansur). ... who then sent their work back in time to roughly 1900BC, in order that the Babylonians could inscribe a table of secants into Plimpton 322.

    5. Re:uh, /hello/. by Anonymous Coward · · Score: 0

      thanks! I only knew of the recursive function, and thought that he had defined the series in terms of that. f defined for f>=1, f=1:1 f=1:2 f=f(n)+f(n-1):>2. I didn't know there was a nice formula! Cool...

    6. Re:uh, /hello/. by Anonymous Coward · · Score: 0

      That's not the function, it's merely the analytical expression for it. A recursive definition counts as a valid definition of a function.

  6. Re:Chicken or the egg by ObviousGuy · · Score: 0, Offtopic

    The egg.

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    I have been pwned because my /. password was too easy to guess.
  7. Easy. by Unknown+Poltroon · · Score: 0, Troll

    CowboyNeals checkbook.

    --
    All Troll + "offtopic" mods are meta moderated as "Unfair", because you abused the system.
  8. The Middle Ages? by ConceptJunkie · · Score: 3, Informative

    Um... you seem to forget the Arabs. In the Middle Ages, the Arabic culture flourished and was the intellectual center of the world, particularly in fields like mathematics and astronomy. It's my understanding that the Arabs were largely responsible for maintaining the knowledge that the ancient Greeks, and others, had developed.

    Why do you think we use "Arabic numbers"?

    Why do you think most stars have Arabic names?

    It's unfortunate that advanced Middle Eastern culture has largely disappeared in the last millenium, and surely Europe, the New World and Far East lead the world in scientific and cultural development now, but there was a lot happening in the Middle Ages.

    And let's not forget Europe. Even before the Renaissance, Europe, while certainly not advancing like it did starting in the 15th century, was hardly stagnant. Most of Western society's major secular institutions: hospitals, universities, etc, were founded in the Middle Ages.

    And of course, we all know that the Chinese had many advanced developments centuries before the rest of the world (gunpowder, paper, etc).

    --
    You are in a maze of twisty little passages, all alike.
    1. Re:The Middle Ages? by ralian · · Score: 2

      Just a small clarification: You're right that we refer to our numerals as "Arabic," but in fact they are Indian in origin, and were brought to the West by Arab traders (as were numerous other inventions, such as chess). I googled up a source for your edification, too (New Scientist).

      --

      -raph

  9. 1/0 by spike2131 · · Score: 1

    1/0 is defined as undefined, I think that just means no one has ever figured out the right answer.

    --
    SpyDock: Scientific Python in a Docker container
    1. Re:1/0 by timster · · Score: 2

      Well, whatever the answer is, it ain't a number. If 1/0 was a number, then 0 would be equal to 1, and all hell would break loose. If you like you can say that the answer is "infinity", since "infinity" isn't a number either.

      --
      I have seen the future, and it is inconvenient.
    2. Re:1/0 by Anonymous Coward · · Score: 1, Informative

      Surely "undefined" is the right answer?

    3. Re:1/0 by RackinFrackin · · Score: 1

      1/0 is defined as undefined, I think that just means no one has ever figured out the right answer.

      No, this means that the quantity 1/0 is literally not defined. Within the field of rational numbers (and also within the reals and complex numbers), there is no number x such that 0 * x = 1, i.e. 0 has no multiplicative inverse. For any number x, 1/x represents the multiplicative inverse of x. Since 0 has no multiplicative inverse, 1/0 is undefined.

    4. Re:1/0 by RackinFrackin · · Score: 1

      If you like you can say that the answer is "infinity", since "infinity" isn't a number either.

      Just saying infinity doesn't tell the whole story, because the function f(x)=1/x diverges in different directions as x approaches 0. From the left, the limit is negative infinity, and from the right it is positive infinity.

    5. Re:1/0 by Spunkee · · Score: 1

      1/0 = +/-infiniti?

    6. Re:1/0 by tolan's+my+name · · Score: 1

      though on the complex sphere [the complex plain with an extra point, infinity, defined 1/0 is equal to infinity and is a reasonably sensible 'number'.

      Maths is all about context.

    7. Re:1/0 by Nate+Eldredge · · Score: 1

      Well, if you do that, you no longer have a field. For instance, I assume 1+inf=inf. In which case (1+inf)-inf = inf-inf = 0 != 1 and you've lost the associative law. Which is certainly a nice property for 'numbers' to have.

    8. Re:1/0 by Tablizer · · Score: 2

      (* 1/0 is defined as undefined, I think that just means no one has ever figured out the right answer. *)

      What do you mean? I can use Visual Basic's trusty console panel to figure it out.

      Okay, let's see. The result is........Damned BSOD! Rats! I'll hafta get back to you on this.

    9. Re:1/0 by Anonymous Coward · · Score: 0

      Ummm, you seem to be a little confused here. It is true that the one point compactification of the sphere does not yield a field. Additionally, you can form the extended reals by adding in +/- infinity, and this will not be a field either. However, doing this is actually very handy in some situations where you in fact do not need the numbers you are working with to form a field. It is possible to go through and work out a valid arithmetic using +/- infinity. The example you gave is generally ruled out by saying that infinity-infinity is undefined. This is all worked out in, I believe eithere chapter 0 or 1, of big Rudin(Real and Complex Analysis, Walter Rudin). It may even be in little Rudin as well, I can't remeber right now though.

  10. Re:Chicken or the egg by Anonymous Coward · · Score: 1

    You know, I always try to convince people of this but no one wants to believe me... This question IS a Creationist vs. Evolutionist question. So depending on your point of view the following are your answers:

    Evolutionist:
    Evolution takes place over centuries and centuries, the modifications to the genetic structure take place via mutations of the genes of an undevelopt offspring, and usually in the "sperm" or "egg-egg". So by this, we know that the egg came first becuase the parent of the first chicken would not have been a chicken, and the offspring of this first "chicken" would be chickens.

    Creationist: Simple, God created the chicken it had sex and had babies. The Chicken came first. (Most likly the roaster and then his bitch). The chicken came first!

    --
    Our local Indian tribe is made up of mostly itiallian men who used to be in the Mob, before the crackdown. The Mob bosses forced the nation to change its name to "Wapaho" (Wâ~pâ~hô)

  11. Re:Chicken or the egg by ObviousGuy · · Score: 1

    I'm sad this thread got modded down -1.

    --
    I have been pwned because my /. password was too easy to guess.
  12. Re:Chicken or the egg by Anonymous Coward · · Score: 0

    As am I. It is quite clear eggs came way before chickens; t-rex eggs where hatching several millennia before chickens.

  13. Fermat by den_erpel · · Score: 1

    Contrary to common belief, Fermat's theorem is not solved or proven.
    Captain Picard refers to it in "The Royale", so that must be 2362 or something.

    The overzealous mathematician that did try to prove it a couple of years ago, almost created a time-space paradox and disaster, which was only just averted.

    Luckily for the Church of Trek
    "And Scotty beamed them to the Klingon ship, where they would be not tribble at all"
    "All power to the Engines"

    --
    Genius doesn't work on an assembly line basis. You can't simply say, "Today I will be brilliant."
    1. Re:Fermat by alienmole · · Score: 2
      You don't understand. All Trek episodes are vetted for Prime Directive violations before being sent back in time for our viewing pleasure. They couldn't reveal that Fermat's theorem was going to be solved in our near future, without disrupting the timeline. So "The Royale" had to be censored, of course.

      If you were a true Trekkie, you would know that and would have copies of the original, uncut episodes...

    2. Re:Fermat by Tablizer · · Score: 2

      (* The overzealous mathematician that did try to prove it a couple of years ago, almost created a time-space paradox and disaster, which was only just averted. *)

      Oh, you mean Enron? It was not averted.

      Beware of accountants using Calculus.

  14. Documented problems? by evalhalla · · Score: 2, Insightful

    I seem to remember that all of the math books we have from the "Greeks" (actually, people from the east costs of the Mediterranean who happended to use some greek dialect for commercial and cultural exchanges) were meant to show results, not problems: most of them are some sorts of summae where somebody expose everything that is known about some subject, with more or less comments and precisations. Some of them actually include what probably were original results of the authors, but always as facts, not problems.

    So, if we look back to greek times we can't have documented problems, but only problems that could have been asked with their knowdlege, expecially if it's similar to some problem they actually solved. If we accept this kind of problems, I believe that the existance of infinite perfect numbers could be a good candidate, as the Greek knew about them, and actually worried about the existence of infinite numbers of other kinds (prime, etc.).

    If, on the other side, you want actual written documentation about the problem, I'm afraid that either we find some fragment of a letter written by some greek or arabian mathematician (quite unlikely) or we have to focus on renaissance.

    Anyway, I'm not sure that problems with fibonacci numbers actually date to Fibonacci's era, as i seem to remember that they were only a small part of his work, and that they were extensively studied only later (by some 1800 French matematician?)

    1. Re:Documented problems? by evilquaker · · Score: 1
      I seem to remember that all of the math books we have from the "Greeks" were meant to show results, not problems: most of them are some sorts of summae where somebody expose everything that is known about some subject, with more or less comments and precisations.

      Even so, it seems strange that they wouldn't indicate what definitely isn't known about a subject, to differentiate it from what is known but not said (because something will always be left out). Perhaps that's a modern development, though...

      --
      To within half a percent, pi seconds is a nanocentury. -- Tom Duff
    2. Re:Documented problems? by evalhalla · · Score: 1

      I think it is a modern developement: in ancient times people actually believed that one could write everything about a subject without leaving anything, probably also because in most disciplines people knew much less than we do today (and as a matter of fact many people succeded in gaining an almost complete knowdlege of disparate disciplines, without our need to specialize).

      Another possible reason is that we consider books to be a way to communicate ideas between contemporary people, so that knowdlege can be shared and used; in ancient times I believe that books were meant more for posterity than for their contemporaries, as most people who studied some subject tended to live in the same place (Alexandria, in a certain period), so they probably foud easier to share their knowdlege between themselves orally.

  15. 1/0= by oliverthered · · Score: 2

    1/0=1/0

    You can solve problems like 1/0 but you need to have context, numbers on there own are meaning less.

    so
    given 1 loaf is equivelent to 2 fishes

    1 pie / (2 fishes - 1 loaf)

    in just numbers becomes
    1/0

    but it's really
    1 pie / (2 fishes - 1 loaf)

    --
    thank God the internet isn't a human right.
  16. =o) by GreenKiwi · · Score: 1

    I don't know... but the answer is 42!

  17. Oldest Unsolved math problem? by Anonymous Coward · · Score: 0

    A: How to carve up a wooly mammoth for a tribe of 300 people and make everyone happy when you only have 4 drumsticks?

  18. the oldest math problem by scaryman · · Score: 0

    what happened to the s in maths ( a hortening of mathematics not mathematic)?

    1. Re:the oldest math problem by scaryman · · Score: 0

      and what happened to the s in shortening:) oops

  19. Hey, dumbass. by Anonymous Coward · · Score: 0

    Are you too stupid to tell the difference between HUMOR and a TROLL? If so, please stop being a moderator, you stupid fuckwit. And read my sig, and maybe THINK for a second.

    1. Re:Hey, dumbass. by Anonymous Coward · · Score: 0

      It really wasn't very funny, although probably not a troll.

  20. Yes and no by GuyMannDude · · Score: 4, Informative

    1) The library wasn't burned by an angry mob, it was burned accidently, by Caeser's army, when some of their missiles (launched from boats) went astray.

    Very interesting. I hadn't heard that before but a quick web search led me to this page where the authors agree with you. I had only heard the mob-burning-library-after-killing-Hypatia story.

    2) Most written documentation on the "great library" suggests it wasn't a library like LoC, but more like a collection of erotic art and poems.

    This statement I find no evidence for in my web search. Most everything I find (such as this) seems to suggest it was the center of learning in the ancient world as I originally posted. It's possible that the scholarly works were in the minority in the library. However it should be noted that this link does describe Alexandrian literature as erotic.

    It would have been nice if you had posted some links but I thank you for the clarifications in any case.

    GMD

    1. Re:Yes and no by raga · · Score: 2, Interesting

      The port of Alaxendria, one of the busiest port-cities, had a law that required ships that came to port to loan all their written scrolls etc. to the library, where it was faithfully copied and archived. That's what made the library (one of) the greatest of its time.

      Cheers- raga

    2. Re:Yes and no by John+Hasler · · Score: 2

      You're both right. The library was burned ("collateral damage" IIRC) by the Romans and then later torched by a mob of christians incited to do so by a bishop. The moslems finished it off.

      --
      Warning: this article may contain humor, sarcasm, parody, and perhaps even irony. Read at your own risk.
    3. Re:Yes and no by Anonymous Coward · · Score: 0

      Where are the originals of all the documents that were COPIED at the library?
      Are the originals or the copies considered to be the "off-site backups"?

    4. Re:Yes and no by Inthewire · · Score: 1

      IIRC, you gave them your copy, they gave you a reproduction (they kept yours)

      --


      Writers imply. Readers infer.
  21. depends a little on what you mean by `unsolved' by Kwantus · · Score: 1

    ... some of them *can't* be solved, like `express the roots of a quintic by radicals.'

    1. Re:depends a little on what you mean by `unsolved' by Nate+Eldredge · · Score: 1

      Notice he said "still open". Proof of the nonexistence of a solution to a problem certainly closes the problem.

  22. Comment removed by account_deleted · · Score: 1

    Comment removed based on user account deletion

  23. my penis + your ass = by Anonymous Coward · · Score: 0

    X.T.C.

    you shameless homo, you.

  24. It's got to be tied to the oldest profession.... by Anonymous Coward · · Score: 0

    How much can I charge for which sexual favour?

  25. Fundamentalist moderators? by alienmole · · Score: 2
    Someone mentions God and gets modded as a troll?

    Presumably the moderator in question didn't follow the link, or do we really have such extreme fundamentalists on /. as to be offended by a movie like Pi?

    1. Re:Fundamentalist moderators? by anthony_dipierro · · Score: 3, Insightful

      I dunno... Slashdot readers watching a movie about a paranoid schizophrenic computer nerd who thinks he has the solution to everything and that everyone is out to get him. Might hit too close to home.

  26. Re:Chicken or the egg by Anonymous Coward · · Score: 0

    i don't know if it's a "Creationist vs. evolutionist" question, but Plato and ARistotle was debating this in their time. Plato concluded that the "idea" or "form" of the chicken came before the chicken or the egg.

  27. Re:Chicken or the egg: egg came first by Frodo420024 · · Score: 1

    Since birds descend from dinosaurs, that one riddle has finally been resolved. :)

    --
    I'm in a Unix state of mind.
  28. Something for nothing by Dark+Coder · · Score: 1

    0 ^ 0 = 1

    Why can't we apply this to solve our financial dire strait?

    1. Re:Something for nothing by Anonymous Coward · · Score: 0

      0 ^ 0 = 1

      Should 0^0 really equal 1?

      If you take the log/exponent definition of power, i.e.

      a ^ b = exp(b * log(a))

      then to compute 0^0 you'd have to compute log(0) - and the only sensible definition of that is -INF. So unless you can justify reducing 0 * -INF to 0 (and I don't think you can) then you're not going to get 0^0=exp(0)=1.

      So you're not getting something out of nothing - you're getting something out of a nasty definition hack.

  29. Reliving the lack of history by Tablizer · · Score: 2

    (* The port of Alaxendria, one of the busiest port-cities, had a law that required ships that came to port to loan all their written scrolls etc. to the library, where it was faithfully copied and archived. That's what made the library (one of) the greatest of its time. *)

    If they were so great, how come they did not have an off-site back-up policy in place?

  30. has to be said by bigsexyjoe · · Score: 1

    I don't know but the answer is 42.