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I know that some of you have tried to create mathematical systems for your conworlds. To what extent did you succeed in making them different at some fundamental level from the algebra, geometry, calculus, and so on of our own mathematics? For example, would it be possible to express Euler's identity in a completely different form?

I keep trying, and failing.

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Math concepts are universal. While there will be differences in notation and numeral systems, even the most exotic aliens will agree with us on the value of pi and the Pythagorean theorem.

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So, we can assume that con-mathematics is doomed to be to Earth mathematics as conscript is to Tengwar?

I did create a non-basal counting system about ten years ago, which Ive always been proud of. Im not sure I saved the details on a computer that still works, but I could reasonably well construct it from scratch if I had to. Essentially it's like counting on a checkerboard, with the corner square being 0, the next two being 1 and 2, then 3 and 4 and 5, and so on. But you spell the coordinates instead of the name, and it's an infinite checkerboard, so there is no limit to the size of each digit, but there will always be only two digits for any number.

The parts I dont remember are how to calculate the function without actually drawing a huge checkerboard, and how to extend it to more than two dimensions.

This system is not likely to be very useful to do math with, but I was creating it for an alien species which has trouble keeping more than one thought in their heads at the same time (indeed, their language only allows one morpheme per sentence, so they have a ridiculously huge vocabulary and no grammar.)

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Sunàqʷa the Sea Lamprey says:

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i see.

so we humans are geniuses for being able to understand discrete sets and continua and logic and algebra and arithmetic and geometry and number and so on?

how lucky!!

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I think any change in mathematics of a conculture would be either :

1) Mostly cosmetic. Different bases, symbols, computing algorithms, etc. If you want a handy reference, you can check "Mathematics across cultures : The History of non-western mathematics".

2) Related to things only mathematicians care about. A lot of mathematical concepts tend to be used mostly for historical reasons, I suspect, but those are only on topics that concern mathematicians. The basis for mathematics used is very often set theory, but it could also work with logical combinators. The set theory used is mostly ZFC (Zermelo-Fraenkel with axiom of Choice), but there are many systems that can be used. Calculus is with the whole deltas and epsilons rigamarole, and so on.

Of course, the thing to remember is that mathematics in cultures is, at least at first, used to answer to needs relating to their life. But those things are, at least in part, related to the physical laws of the universe.

For instance, if there was a noticable curvature of space, or even if it wasn't at all similar to our old Euclidian space, the laws of geometry developped would reflect that. Sure, they could change later on to include more general spaces, like we did, but that's not what's taught to everyone. Calculus and such is quite a bit related to the apparently continuous space. And so on.

I don't understand most of the responses so far. I mean, trivially, there is a huge amount of mathematics now that there wasn't 2000 years ago, or 1000, or 500, or 100. There's no reason at all to expect some culture we've never talked to before to have "the same concepts".

Well how far technologically are they. A society with FTL tech would most defiantly have math. A civilization that lives in the desert hunting squirrels and tanning leather for shelters may not have math at all.

My knowledge of math unfortunately isn't good enough to do this with the level of verisimilitude I'd like to have. But I rather like the idea of Saimi mages discovering public-key cryptography (the RSA algorithm or something like it), and treating it as an utmost sacred thing that makes the magical ideal of Perfect Secrecy possible. Partially this is because I've personally thought RSA to be cool as hell ever since I learned how it works like a year and a half ago. Unfortunately the Saimi mages, while they had a lot of things, did not have computers in our sense, and without computers it's hard to imagine people making widespread use of encoding and storing the written word as manipulable numbers.

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I'm not entirely sure what the OP is asking about.
Could there be a conworld where the laws of mathematics are different? Could 1+1=3? No, because mathematics is also constructed - if you have invented the concept of addition, it will work the same as in our world, because otherwise it's not addition you've invented.
Could a conculture be interested in completely different concepts? Could they just not care about addition, and rather regard some completely different operations as fundamental? In theory, yes, but probably not in any universe which has dimensions like ours, so your whole conworld wold likely be nothing more than a peculiar number exercise. It's more a matter of conphysics, and that usually only leads to confusion.

On the other hand, you can certainly change the way they think of and handle numbers. Here are a few ideas:
- Different bases, obviously. My conpeople use base 16 for the most part, but sometimes 2 or 240.
- Entirely different ways of writing numbers. My conpeople used to use a completely additive system, where you could write the symbols in any order. Not unusual, come to think of it.
- Inventing zero. Our own culture still has a long way to go here - we still call the first day of the month "1", and plenty of other things.
- Inclusive/exclusive intervals. When we say "ages 10-12" we probably mean three years, which doesn't really make sense - we are basically saying "ages 10.0000 to 12.9999".
- Sticking to integers. In fact, our society went from inventing continuous numbers to realising that nature is quantised in only a few millennia - you could skip that step.
- Different angle measurements. It's a small thing, but the full circle isn't necessarily 360 or 2π. Some have also redefined π to be twice as big, which would mess up Euler's identity at least a little. My conpeople also treat angles a little different; they see a straight angle as 0, because it means there is no angle, and a full turn as 1/2. That means the sum of the angles is 1 for any geometrical figure, including a circle.
- Developing things in a different order. The Greeks developed geometry earlier than what was really useful, my conpeople developed symbolic logic instead.
- Relativistic maths. If you have some peculiar alien species which moves really fast, they would need different calculations. They might for example see rapidity as more fundamental than speed.
- Non-Euclidian space. I don't advise it, tho.
- Trivial arithmetic systems. Gödel's theorem says that a non-trivial arithmetic system can't be complete and coherent - what if your conpeople decide to go with one that's trivial?

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It seems to me there are two quite different questions here...

#1, the fundamentals of nature are what they are regardless of who's doing the describing, yes.

But #2, what different species, or alternative human cultural histories, will care about while investigating those relationships may be subject to wild variation, as may their approach to various topics.

For instance the discrete/continuous issue Torco brought up is much more realistic than you guys gave him credit for - if a species starts out with a mainly continuous view of quantity, and here I'm talking about their roots, not what they are "capable of conceiving of" which is different and stupid to assume a limit on, then whatever mathematical structures they work out may be very different in flavor from ours.

An even deeper point of potential variation is what the purpose of math is conceived to be by the society/species. For instance I could easily imagine aliens that are not highly tolerant of purely theoretical musings, with only practical concerns considered legitimate. They'll get the same value for pi that we do, but they may not give a shit that e = -1 and might, for example, not bother to work out something like complex numbers until such time as working with electricity forces it. Or they might not care about proving things absolutely, the way we do. Proof is what our mathematicians are usually after when they investigate a behavior, as this is part of our conception of what understanding consists of: the immense value (as we see it of) of demonstrations that something must be true. Another culture may find it sufficient that something only seems to hold... and perhaps get some wrong answers that way, too.

Another point of variation: what the operations are. The hierarchy of operations we use goes like this: first there's counting, i.e. incrementing by one; then there's addition, which is a way to count incrementings; then there's multiplication, which is a way to count additions; then there's exponents, which are a way to count multiplications; and though we have little use for it there is also "tetratation", a way of counting exponentiation. So there's room for variation: a species/culture could just stop at multiplication, say, the way we usually stop at exponentiation, while another may go several levels further. It's not necessarily even arbitrary, there are reasons one might stop at multiplication - for example the fact that while addition and multiplication are commutative, exponents aren't. It might be held as a value that that makes them untenable, say. Perhaps another species might work out a different extension of multiplication that is commutative. (That may be impossible, but if anybody wants to argue that it is, I demand proof!). Also, for alien species, there's no reason an operations system even has to be based on the notion of counting (but I think anything human would have to be). What else might it be based on? Maybe operations could be based on the properties of things rather than their quantities, for example shape deformations, or cycles of change. Exactly how to make that work I couldn't say, but it seems plausible that ten thousand years of a species' smartest minds might be able to make something of it. Whether a conworlder could make something of it is less likely.

When you get right down to it, all mathematics is conmathematics.

One idea I've been playing around with is an extension of Riemannian geometry, which works as follows:

Let the distance between two points z and y (which are points on some manifold) be the integral of a function L from z to y, where

L=sqrt(g(x)dxdx) + k(x)dx, summation over repeated indices is implied.

If the second term in L were dropped we'd have standard Riemannian geometry. For simplicity I assume that g(x) is a symmetric tensor, though that's not strictly necessary. My inspiration for this comes from examining the motion of a charged particle in an EM field moving in a curved spacetime, however this physical interpretation is not necessary.

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well yeah, the naturals mod 1000 but why? 1000 is not even particularly big a number

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