What are some of your unpopular opinions in math? (not about math) (sh.itjust.works)

submitted 2 days ago* (last edited 2 days ago) by Ad4mWayn3@sh.itjust.works to c/asklemmy@lemmy.world

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For example: I don't believe in the axiom of choice nor in the continuum hypothesis.

Not stuff like "math is useless" or "people hate math because it's not well taught", those are opinions about math.

I'll start: exponentiation should be left-associative, which means a^b should mean b×b×...×b } a times.

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[-] MartianSands@sh.itjust.works 14 points 2 days ago* (last edited 2 days ago)

X^0 and 0! aren't actually special cases though, you can reach them logically from things which are obvious.

For X^0: you can get from X^(n) to X^(n-1) by dividing by X. That works for all n, so we can say for example that 2³ is 2⁴/2, which is 16/2 which is 8. Similarly, 2¹/2 is 2⁰, but it's also obviously 1.

The argument for 0! is basically the same. 3! is 1x2x3, and to go to 2! you divide it by 3. You can go from 1! to 0! by dividing 1 by 1.

In both cases the only thing which is special about 1 is that any number divided by itself is 1, just like any number subtracted from itself is 0

[-] brewbart@feddit.org 1 points 17 hours ago

It's been a few years since my math lectures at university and I don't remember these two being explained so simple and straightforward (probably because I wasn't used to the syntax in math at the time) so thanks for that! This'll definitely stick in my brain for now

this post was submitted on 18 May 2025

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