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2d
revised Is the max of two differentiable functions piecewise-differentiable?
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2d
comment Is the max of two differentiable functions piecewise-differentiable?
@user24142: you're absolutely right but, I'm guessing OP isn't familiar with the concept of "almost-everywhere" in a rigorous sense.
2d
answered Is the max of two differentiable functions piecewise-differentiable?
2d
answered For what real values does $\phi(x):=1+x+ \dots + x^{2m-1}$ take the value $0$? What can you say about the sign as $x$ varies?
2d
comment Sufficient conditions on integration kernel for continuity of the integral operator
Are you allowing for Cauchy Principle Value interpretations of the integral?
2d
comment What is it like to understand complicated/advanced mathematics?
If you look at the last page of a math textbook, it's probably hard. If you work your way through the textbook, it's not so bad.
2d
comment Methods of solving nonlinear systems of equations derived from combinatorial problem
These are known as the Vieta relations
Apr
21
comment does convexity implies $g(u)>cu$?
@asosnovsky: $g(u)=1/u$ has positive second derivative, but not positive first derivative.
Apr
21
comment does convexity implies $g(u)>cu$?
concave means $\frac{d^2}{du^2}g(u)\leq 0$. Also, it's not true that the first derivative is bounded below. For example, $y(x)=x^4$ has $\frac{d^2}{dx^2}x^4=12x^2\geq 0$ but $\frac{d}{dx}x^4=4x^3$ is not bounded below by any $c$.
Apr
21
answered Two Poisson processes
Apr
19
answered Asymptotic stopping time for a ball-drawing problem
Apr
18
revised Deciphering proof of SLLN
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Apr
17
answered Deciphering proof of SLLN
Apr
17
comment Find probability of $X\leq Y$
@QYang: And be careful, $F_X(x)=0$ for $x<1$.
Apr
17
comment Intuition for Entropy over Fractals
mathoverflow.net/questions/146463/what-is-entropy-really
Apr
17
revised Find probability of $X\leq Y$
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Apr
17
revised Find probability of $X\leq Y$
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Apr
17
comment Intuition for Entropy over Fractals
There are a million different definitions of entropy, mathematical or otherwise, so this question is not well posed. One of them is Shannon Entropy: en.wikipedia.org/wiki/Entropy_%28information_theory%29
Apr
17
answered Prove by mathematical induction: $\frac{1}{n}+\frac{1}{n+1}+\dots+\frac{1}{n^2}>1$
Apr
17
answered Find probability of $X\leq Y$