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1d
reviewed Reject Approximate $1 + (c^2 - 1) e^{-x^2/2}$ with a power law
1d
reviewed Approve If $a,b,c\in\mathbb{R^+}$ such that $ abc = 1 $ and $ ab + bc + ca = 5 $. Prove that $ 17/4 \leq (a+b+c)\leq 1+ \sqrt{32}. $
1d
reviewed Approve What is $\int \frac{e^x}{(e^x - 3)(e^{2x}+1)}dx$
2d
reviewed Approve Three different examples of three consecutive triangular numbers whose sum is a perfect square for n > or equal to 20
Jan
28
answered Is $a_n={\{\dfrac{1}{n^2}+\dfrac{(-1)^n}{3^n}}\}$is monotonically decreasing?
Jan
26
answered Limit evaluation $\lim_\limits{x\to2}\frac{\sqrt{12-x^3}-\sqrt[3]{x^2+4}}{x^2-4}$
Jan
25
comment convergence of $(1+\frac{1}{2})(1+\frac{1}{4})\ldots(1+\frac{1}{2^n})$
Hint: $\ln(1+x)\leqslant x$ for $x>0.$
Jan
21
reviewed Approve $y'' - y' = e^x$ (Variation of Parameters)
Jan
20
reviewed Approve How do I find the coefficient of $x^2$ in this polynomial, given its value at three points?
Jan
19
reviewed Approve How can I prove that $x-{x^2\over2}<\ln(1+x)$
Jan
19
comment prove the given inequality (for series )
Hint: It can be proved by induction that $2 \sum\limits_{k=1}^n {\frac{1}{k^3}}<3-\frac{1}{n^2}.$
Jan
13
answered How can I compute $\lim_{x \to 0^+} \frac{\sqrt{e^x-1}-e^x\sqrt{x}}{x}$?
Jan
13
reviewed Approve Maths problem on distance
Jan
13
reviewed Reject Can there be weak* open cover of the dual banach space with the arbitrary small (in diameter) sets?
Jan
11
reviewed Approve Computing number of points in elliptic curve through frobenius endomorphism
Jan
5
reviewed Approve Calculate the limit of $(1+x2^x)/(1+x3^x)$ to the power $1/x^2$ when $x\to 0$
Jan
5
revised $\int \frac{\sin(x)}{e^x} \, dx$ Efficiently
added 384 characters in body
Jan
5
revised $\int \frac{\sin(x)}{e^x} \, dx$ Efficiently
added 331 characters in body
Jan
5
answered $\int \frac{\sin(x)}{e^x} \, dx$ Efficiently
Dec
25
reviewed Approve How close apart are two message - “Document Distance” algorithm