Beni Bogosel
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 22 How prove $A^2=0$,if $AB-BA=A$ 22 Proving that $2$ is the only real solution of $3^x+4^x=5^x$ 22 Elementary proof of $m^n\neq n^m$ for almost all natural numbers $m\neq n$ 20 Inequality: $(x + y + z)^3 \geq 27 xyz$ 17 For complex $z$, $|z| = 1 \implies \text{Re}\left(\frac{1-z}{1+z}\right) = 0$

Reputation (13,855)

 +75 Proving $\frac{1}{c} = \frac{1}{a} + \frac{1}{b}$ in a geometric context +30 Why $-1 \leq\frac{\langle A,B\rangle}{||A||\, ||B||}\leq1$? +10 $x\over(1-x)$ $y\over(1-y)$ $z\over(1-z)$ >= 8 when $x ,y ,z$ are positive proper fractions and $x+y+z = 2$ +15 Equal-area sparse spherical shell partitioning

Questions (79)

 43 Double sum - Miklos Schweitzer 2010 36 Putting many disks in the unit square 27 “Immediate” Applications of Differential Geometry 24 Picard's Little Theorem Proofs 20 Old AMM problem

Tags (178)

 230 calculus × 60 73 sequences-and-series × 29 208 real-analysis × 74 67 analysis × 31 104 linear-algebra × 37 62 inequality × 18 94 limits × 27 59 elementary-number-theory × 11 84 algebra-precalculus × 16 50 geometry × 42

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 Mathematics 13,855 rep 22892 MathOverflow 579 rep 421 Ask Ubuntu 456 rep 2516 TeX - LaTeX 365 rep 1412 Computational Science 265 rep 19