Fake proof that 1 = -1 (Can't understand the mistake)
3712
Why $\sqrt{-1 \cdot {-1}} \neq \sqrt{-1}^2$?
14559
Binomial[-1,-1]
108244
Proof without solving equation that if $(1+z)^n = (1-z)^n$ then Re(z) = 0. Did I do it right?
5347
Using the definition of a vector space to prove that $0x = 0$ and $(-1)x = -x$
111515
Proving that $-a=(-1)\cdot a$
14150
Zero to the zero power – is $0^0=1$?
51877
Why is this 'Proof' by induction not valid?
2959
Prove $0! = 1$ from first principles
108923
What is wrong with this false proof? $-1=(-1)^1=(-1)^\frac{2}{2}=((-1)^2)^\frac{1}{2}=\sqrt{(-1)^2}=\sqrt{1}=1$
23883
$\infty = -1 $ paradox
80004
Why is $1/i$ equal to $-i$?
32950
Fake induction proofs
13363
Why does an argument similiar to 0.999...=1 show 999...=-1?
111938
How do I find a flaw in this false proof that $7n = 0$ for all natural numbers?
130854
Constructing example showing $\mathbb{E}(X^{-1})=(\mathbb{E}(X))^{-1}$
154133
Flawed proof by induction that $a^{n-1}=1$
61604
$V = V_1 + V_2$ confusion? Why is my "proof "incorrect?