Is my solution for the proof of $x^2+xy+y^2 > 0$ correct?
121353
If $x$ and $y$ are not both $0$ then $ x^2 +xy +y^2> 0$
86211
If $x+y+z \geq xyz$ Prove that $x^2 + y^2 + z^2 \geq xyz$.
71361
Prove that $x^x+y^y=z^z$ doesn't have integer solutions
158335
Why is this $0 = 1$ proof wrong?
31783
Is this proof of $ab = 0$ correct?
101499
Prove $e^{x+y}=e^{x}e^{y}$ by using Exponential Series
13572
$x^y+y^x>1$ for all $(x, y)\in \mathbb{R_+^2}$
45555
$(x+y)^c\le x^c+y^c$ for $0<c\le1$
146126
Infinite positive integer solutions of the equation: $x^2+x+1=(y^2+y+1)(n^2+n+1)$
41364
How to prove that $x^y - y^x = x + y$ has only one solution in positive integers?
43537
How can $x^2y''-3xy'+3y=0$ be solved?
45918
Inequality: $x^2+y^2+xy\ge 0$
105047
Prove the inequality $|xy|\leq\frac{1}{2}(x^2+y^2)$
116223
Show that the angles satisfy $x+y=z$
20532
Are these solutions of $2 = x^{x^{x^{\:\cdot^{\:\cdot^{\:\cdot}}}}}$ correct?
158447
Limit as $(x,y)$ approaches $(0,0)$ of $(1+x^2+y^2)^{\frac{1}{x^2+y^2+xy^2}}$
20626
Prove that $x^y < y^x$