Math Memes

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Memes related to mathematics.

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1: Memes must be related to mathematics in some way.
2: No bigotry of any kind.

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Proof by fucking obviousness (sh.itjust.works)

submitted 3 weeks ago by silverchase@sh.itjust.works to c/mathmemes@lemmy.blahaj.zone

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[–] bleistift2@sopuli.xyz 5 points 3 weeks ago (2 children)

My math teacher would be angry because you started from the conclusion and derived the premise, rather than the other way around. Note also that you assumed that division is defined. That may not have been the case in the original problem.

[–] lseif@sopuli.xyz 2 points 3 weeks ago (1 children)

isnt that how methods like proof by contrapositive work ??

[–] bleistift2@sopuli.xyz 3 points 3 weeks ago (1 children)

Proof by contrapositive would be c<0 ∨ c≥1 ⇒ … ⇒ xc≥x. That is not just starting from the conclusion and deriving the premise.

[–] lseif@sopuli.xyz -2 points 3 weeks ago (1 children)

i really dont care

[–] bleistift2@sopuli.xyz 2 points 3 weeks ago

Then don’t get involved in this discussion.

[–] friendlymessage@feddit.org 1 points 3 weeks ago* (last edited 3 weeks ago)

Your math teacher is weird. But you can just turn it around:

c < 1

c < x/x | •x

xc < x q.e.d.

This also shows, that c≥0 is not actually a requirement, but x>0 is

I guess if your math teacher is completely insufferable, you need to add the definitions of the arithmetic operations but at that point you should also need to introduce Latin letters and Arabic numerals.