**Physicist**: Similar. We’re sure to have figured out stuff they haven’t, and they’re sure to have figured out stuff we haven’t. But there’s likely to be a fair amount of overlap.

Some things have a way of being figured out over and over. For example, the Pythagorean theorem got itself figured out in China, Greece, India, and Babylonia (Iraq).

However, there’s a fair chance that old school mathematicians were just copying each other. Specifically, Pythagoras probably stole “his” theorem from the Egyptians (Discoveries aren’t named after the first person to make them, they’re named after the last). Still, it’s the sort of thing that’s so useful and easy to prove that it’s hard to imagine an advanced culture not knowing about it.

And some ideas are just good. We can say it’s very likely that aliens have invented hammers, because people (in every culture), several other varieties of apes, several monkeys species, otters (cutest), and others have all done it. However, being a good idea doesn’t mean that different people/things will create exactly the same thing. For example the Old World (Europe, Africa, Asia) and Incan abacuses are subtly different.

Point is, there are almost certainly going to be commonalities. At the same time, things like the Goldbach conjecture (every even number can be expressed as the sum of two primes), or half of the more obscure theorems in the more obscure mathematical disciplines, are unlikely to be in alien textbooks. Math, being an infinite science, is going to have plenty of twists and turns that only one civilization figures out, and many more that none figure out.

Which mathematical things are most likely to be common is the sort of question best left to sci-fi writers, and other experts (such as there are).

Ultimately the physical predictions each of our sciences make will be the same. Because of, you know: reality. Physics is just a mathematical and philosophical structure that describes the universe. What’s very surprising (or, alternatively, very *not* surprising) is that you can describe (predict) the same physical laws and behaviors based on very different (one might even say; “alien”) premises.

For example, Newton’s first and third laws (“inertia” and “for every action there’s an equal and opposite reaction”) are essentially statements about the conservation of momentum. That is, if you total up the momentum (mass times velocity) of a closed system, then the total momentum remains constant forever. Now, you can mumble something about Lagrangians or reference frames, but when you boil it down, conservation of momentum is just something we take as true (because it always, always works).

But an alien might have a different way of approaching the same set of laws. Rather than saying “for a given system, if you multiply the velocity of each object with the mass of each object and add them all up you get something that never changes” (conservation of momentum), that E.T. might say something like “for a given system, the center of mass never accelerates”. Same laws, different intuition.

Like the abacus/yupana and big-rock/hammer parallels, these different theories do exactly the same thing, but look pretty different.

So (pressed for an answer), I’d expect that no matter how alien an Alien is, whether non-social, immortal, hive-minded, slug-based, whatever, their physics and math has to do a lot of the same stuff ours does, and may even be understandable (to our non-hive minds). At the very least, our physics and Alien physics has to describe the same universe. So, while they may have a completely different approach, it should look familiar, and ultimately do the same stuff.

if we meet aliens, their math may or may not be the same, but their science will be much different from ours- our science will after all have been proven incorrect in a number of important ways (“c”, i’m looking at you…) by the feasibility of such a meeting

Like us, they still would not have gotten past,ITS turtles all the way down,?

That old womans reply,bears more truth than 100 cern labs.

Is it possible that what we consider non-computable mathematical structures would be computable to an alien lifeform? Does the human sensory perceptual mechanism impose constraints on what we deduce to be computable vs non computable?

It’s not a matter of perception so much as a matter of logic. Even blind, slug aliens would think the same set of problems are computable or not, if they’d discovered the same math that we have.

Maybe you’re assuming they’re physically similar to us? (e.g. living on solid matter, with arms and eyes etc).

What about magnetic aliens that live on the surface of stars? Before you laugh, see what Ian Stewart – mathematics professor at University of Warwick – has to say…

http://www.youtube.com/watch?v=UQA5iawH-wA

The thrust is that the mathematics they discover is probably going to be highly dependent on their environment and physical form. Triangles and counting are central to ours, since we had plenty of solid objects lying around we could use to build the conceptula foundations of our mathematics. Magnetic aliens that live on plasma flows might entirely miss those concepts, but perhaps develop a very advanced fluid mechanics instead, for example.

Their mathematics should be logically consistent with ours (same physical universe), but the translation between ours and theirs might be difficult.

Thoughts?

I would venture the guess that an advanced alien civilization would find our attempts at science and mathematics rather primitive and comical. They would probably find our music to be incomprehensible and pointless noise (yes, also Mozart and Bach…) and would not be able to make head nor tail of the weird human output we call “art”. (Sexuality on the other hand and what it means to us might be most fascinating to them.)

Mathematics of course has a special status among all human endeavor. It’s intellectually our most non-trivial achievement. Yet, aliens are probably very confused by our “mental models” underlying our axiomatic systems (and it is doubtful they will be as preoccupied by “logical consistency” and axiomatics as we are). Especially, the notion of infinite sets will probably appear rather weird to them. Since it’s a completely fictional notion that can not be justified logically or rationally and does not reflect any aspect of reality. Yet our axioms can be easily translated into finite models (I would assume ultrafinitism is the aliens way of doing math, something the human brain can not really cope with). After they have understand our formalism I would think that there will be some of our more nontrivial proofs, logical moves and steps that could be interpreted as a sign of intelligence by them (forget ALL the rest of human activity, literature, science etc.. it is way too trivial and primitive). And then maybe they will not eradicate us.