Unable to understand what is wrong with this proof 1 = -1
3712
Why $\sqrt{-1 \cdot {-1}} \neq \sqrt{-1}^2$?
14633
What's the thing with $\sqrt{-1} = i$
89535
fake proof of $\forall a. \forall b. a = b \to 1 = 0$
5347
Using the definition of a vector space to prove that $0x = 0$ and $(-1)x = -x$
78736
Check my proof that $(ab)^{-1} = b^{-1} a^{-1}$
1002
Where is the flaw in this "proof" that 1=2? (Derivative of repeated addition)
13363
Why does an argument similiar to 0.999...=1 show 999...=-1?
28502
How to solve $x^3=-1$?
101169
Prove that $x^2 = - 1$ has no solution in $\mathbb{Z}$
108633
Why $f^{-1}(f(A)) \not= A$
121052
Where is the mistake? $-1=(-1)^{2/2}=\left(\left (-1\right)\displaystyle ^2\right)^{1/2}=1^{1/2}=\sqrt 1=1$
22397
Is 0.9999... equal to -1?
158842
What is wrong with this bijection from all naturals to reals between 0 and 1?
33402
What is wrong with this funny proof that 2 = 4 using infinite exponentiation?
19628
What is wrong with this fake proof $e^i = 1$?
75387
A proof that $1=2$. May I know why it’s false?
51877
Why is this 'Proof' by induction not valid?