How many ways so that $x+y+z\leq n$?
27218
How to use stars and bars for solving number of integral solutions to an equality?
35184
If $z_n \to z$ then $(1+z_n/n)^n \to e^z$
27911
How can I prove that $xy\leq x^2+y^2$?
25203
with inequality $\frac{y}{xy+2y+1}+\frac{z}{yz+2z+1}+\frac{x}{zx+2x+1}\le\frac{3}{4}$
126820
How many positive integer solutions are there to the equality $x_1+x_2+...+x_r= n$?
85917
Solve $(x+1)^y-x^z=1$
116223
Show that the angles satisfy $x+y=z$
1001
Number of integer solutions of $x^2 + y^2 = k$
54355
$1+x+\ldots+x^n$ perfect square
32149
Proof of the inequality $(x+y)^n\leq 2^{n-1}(x^n+y^n)$
72081
$\forall x,y>0, x^x+y^y \geq x^y + y^x$
152311
Proving expression$\geq 2$, where variables are $x,y,z$
65843
Number of possible combinations of x numbers that sum to y
45370
Is it true that $|d(x, z) - d(y, z)| \leq d(x, y)$ and how do I prove it?
111443
Optimization of $2x+3y+z$ under the constraint $x^2+ y^2+ z^2= 1$
55562
Number of total possibilities for an equation
25419
If $n\geq m$ then $(x^m+y^m)^{1/m} \ge (x^n+y^n)^{1/n}$