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seen 9 hours ago

Dec
8
revised Upper bound for norm of Hilbert space operator
improved formating
Dec
8
answered Upper bound for norm of Hilbert space operator
Nov
8
answered Why is it that the vector space of all derivations has the basis $\partial/\partial{x_1} \ldots \partial/\partial{x_n}$?
Nov
6
answered Why is this true:$ \nabla \cdot (\vec V \otimes \vec V)=(\vec V\cdot \nabla ) \vec V +\vec V(\nabla\cdot \vec V) \;\;? $
Jul
19
revised Suppose $xyz=8$, try to prove that $\sqrt{\frac{1}{1+x}}+\sqrt{\frac{1}{1+y}}+\sqrt{\frac{1}{1+z}}<2$
Replaced the initial wrong proof.
Jul
18
answered Suppose $xyz=8$, try to prove that $\sqrt{\frac{1}{1+x}}+\sqrt{\frac{1}{1+y}}+\sqrt{\frac{1}{1+z}}<2$
Jul
10
comment Proving $\frac{a^4}{b^3} +\frac{b^4}{c^3} +\frac{c^4}{a^3} \ge 3$
There was a typo. I corrected it. Thanks.
Jul
10
revised Proving $\frac{a^4}{b^3} +\frac{b^4}{c^3} +\frac{c^4}{a^3} \ge 3$
Corrected typo
Jul
10
revised Proving $\frac{a^4}{b^3} +\frac{b^4}{c^3} +\frac{c^4}{a^3} \ge 3$
Improved formatting
Jul
10
answered Proving $\frac{a^4}{b^3} +\frac{b^4}{c^3} +\frac{c^4}{a^3} \ge 3$
Jul
9
comment Proving $\frac{a^4}{b^3} +\frac{b^4}{c^3} +\frac{c^4}{a^3} \ge 3$
Can you explain me how you deduced $\min_{a^5+b^5+c^5=3}\frac{a^4}{b^3} +\frac{b^4}{c^3} +\frac{c^4}{a^3} \ge \max_{a^5+b^5+c^5=3}3(abc)^{\frac 1 3}$?
Jun
18
answered Please the Inequality in the proof of The Isoperimetric Inequality
May
18
awarded  Yearling
May
7
awarded  Caucus
Apr
28
awarded  Enlightened
Apr
28
awarded  Nice Answer
Dec
4
awarded  Fanatic
Nov
23
answered Find the maxium $\frac{bc}{a^{2}b+a^{2}c}+\frac{ac}{b^{2}a+b^2c}+\frac{ab}{c^2a+c^{2}b}$
Nov
16
answered Expressing a symmetric polynomial in terms of elementary symmetric polynomials using computer?
Nov
8
revised Proof of the inequality $(p-a)(p-b)(p-c)(a^2+b^2+c^2+ab+bc+ca)/(4abcp^2)\le 2/3$
Added details