Take introductory proof course

>take introductory proof course
>become obsessed with questioning and proving everything I was ever taught about math
>what is real? what was lies? what is provable?

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Veeky
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prove a negative times a negative is a positive then cunt

that's what I thought. babby tier bitch can't prove it within 7 minutes

(-x)*(-y) = (-1)*x*(-1)*y
= xy*(-1)^2
= xy

prove -x = -1*x

is this a bait?

>doesn't even use [math]\rm\LaTeX[/math]
Yes.

extremely useful

isn't it true by definition?

you have to prove it.

>proving definition
what?

no

You say that for every x there exists such and m such that x+m=0
Thus m=-x

No its not. That's not an axiom lol

x(0)=0
x(1+(-1))=0
x+(-1)x=0
(-x)+x+(-1)x=-x
(-1)x=-x

I skipped some identity steps but hopefully you are smart enough to fill those in

I get your proof (who wouldn't). But I thought it is defined, my fault, must have mistaken it with something else.

>x(0)=0
This isn't an axiom either.

>>what is real? what was lies? what is provable?

You are going to cry like a baby when you learn about Gödel's incompleteness theorems.

>what is real?
[eqn] 47=47 [/eqn]
>what was lies?
[eqn] 46=47 [/eqn]
>what is provable?
[eqn] 46\neq47 [/eqn]

what is real?

>take second semester of analysis
>question whether the euclidean metric is actually a metric

Question everything.

>baby's first time questioning something
>because of a college course
Next comes you saying communism is alright and that white men need to pay reparations for the black community

Both are unironically true btw

>caring about proof
lol just use it if it works silly maths students

>>become obsessed with questioning and proving everything I was ever taught about math
>>what is real? what was lies? what is provable?

Happened to me too. Take a course or read a book on set theory and mathematical logic and you'll get your fill.

Veeky Forums-science.wikia.com/wiki/Mathematics#Set_Theory.2C_Mathematical_Logic.2C_and_MetaMathematics

Finally, you are beginning to see. Look into flat earth theory for further realization.

Yeah it is retard

There's nothing to prove, it's just something humans have decided is the most useful.