Whats wrong with this proof? Are laws of surds different for negative numbers?
3712
Why $\sqrt{-1 \cdot {-1}} \neq \sqrt{-1}^2$?
16172
My proof of $I \otimes N \cong IN$ is clearly wrong, but where have I gone wrong?
126633
Is a contradiction enough to prove a set equality to $\varnothing$?
107390
Why is (-1)(-1) = 1?
155635
Why is the math for negative exponents so?
29531
A Question On Euler's Proof Of the Basel Problem
111515
Proving that $-a=(-1)\cdot a$
127733
How to prove De Morgan’s laws without using contradictions
158335
Why is this $0 = 1$ proof wrong?
24413
Why is $\mathbb{Z}[\sqrt{-n}], n\ge 3$ not a UFD?
158842
What is wrong with this bijection from all naturals to reals between 0 and 1?
33866
Show that $n$ does not divide $2^n - 1$ where $n$ is an integer greater than $1$?
2269
Proof that the real numbers are countable: Help with why this is wrong
121469
Proof of observations on natural numbers being expressed as differences of squares.
83778
An incorrect proof by exhaustion
98733
Proof for the calculation of mean in negative binomial distribution
150937
Basic Algebra Proof on Integers - Weak Inequalities Work but Strict Inequalities Don't?