1-1 = ?

Why. Why. WHYYYY. Every day I’ve seen one of these posts. 1-1=0 FOR THE LOVE OF EVERYTHING ITS COMMON KNOWLEDGE. ITS NOT ANYTHING BUT 0!!! These threads kill me.

Isn’t the answer undefined? Or error or empty sum or something?

N+ doesn’t contain zero, but you define the value set for the results of your equation and don’t adjust only parts of the equation unless I’m wrong.

Maybe #2 is just a silly answer for a silly question, then nvm me. I’m German, we don’t have humor!

seamusthenerdman said in #41:
> Why. Why. WHYYYY. Every day I’ve seen one of these posts. 1-1=0 FOR THE LOVE OF EVERYTHING ITS COMMON KNOWLEDGE. ITS NOT ANYTHING BUT 0!!! These threads kill me.

oof. Yeah I think everyone already knows what 1 - 1 is like you said, it's just some proposed "fun interesting brain teasers".

linuswannamaker said in #36:
> Here's an alternate proof:

Problem is, you're transforming 0 = 0 into undefined = undefined
Just because a=b and doSomething(a)=doSomething(b) doesn't mean a=doSomething(b)

Therefore, for a=0, 1 - 1 is still 0

Mihir_katti said in #39:
> 1-1=1. If 1+1=11, then 1-1=1

That last sentence is technically true under the "implies/if then" operator

1-1 = my interest in this thread

1-1 = π [because ∞ - ∞ = π (Riemann's paradox)]
Note: It's obviously a joke!

No fam what the heck
I have 1-1 interest in this topic so now stop it. No more. it's a brain teaser, but this is a chess site! You're supposed to discuss chess, and not put fancy math problems.

Here's a position where 1-1 ≅ -1/2


TobyTheChessDog said in #46:
> No fam what the heck
> I have 1-1 interest in this topic so now stop it. No more. it's a brain teaser, but this is a chess site! You're supposed to discuss chess, and not put fancy math problems.

Off topic discussion though

Also nice username...

When I saw this I thought you were talking about a 1-1 game, so every move you make you lose 1 second. That would be really interesting actually lol.

1-1=2-2

@StevenEmily said in #43:
> linuswannamaker said in #36:
>
>
> Problem is, you're transforming 0 = 0 into undefined = undefined
> Just because a=b and doSomething(a)=doSomething(b) doesn't mean a=doSomething(b)
>
> Therefore, for a=0, 1 - 1 is still 0
Well, that would be the case if I had said a=a, thus b=b. I didn't say that.
1-1=n
(1-1) (a) = (n) (a)
1a - 1a = na
Thus:
n = (a-a)/a
So for a = 0,
n is not 0
n=(0-0)/0
0 is not (0-0)/0 so n can't be 0
(any number)/0 is undefined so n is undefined.