Why is the possibility $x-y = 0$ rejected?
11707
If $x\sqrt{1+y}+y\sqrt{1+x}=0$ find $y'$
16264
Why does $x$ divided by zero not equal $x$?
115506
What's wrong with this demonstration? (1 = -1)
23128
Why aren't logarithms defined for negative $x$?
94319
Expected value of $|X - Y|$
59653
$x^2-y^2=2s$, s cannot be an odd integer
85076
Is it true that $d(x,Y)=d(x,y_0)$ for some $y_0 \in Y$ when $Y$ is closed?
129677
Problem with Density of $X-Y$
49453
Why do I have to solve for $x$ in this proof, if I choose not to find a counterexample?
136538
How can I show that a bijection between $[0,1)$ and $(0,1)$ cannot be continuous?
157733
Are positive real numbers $x,y$ allowed to be taken out during this proof?
61472
If $0<x<y$, then prove that $\sqrt{x} <\sqrt{y}$ and $x <\sqrt{xy} <y$
128639
Homoskedasticity Assumption: Var(y|x)=Var(u|x)=constant?
105852
How to verify whether or not there exists a vector $x$ such that $Ax > 0$?
24307
Is $x^x=y$ solvable for $x$?
119937
Why does (0 < 5 < 3) return true?
96554
Why is $x^0 = 1$ except when $x = 0$?