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1d
reviewed Reopen The Dual of a Dual problem for Convex Optimization Problem
1d
reviewed Reopen Calculate $\int^{1/2}_0\int^{1-x}_x (x+y)^9(x-y)^9 \, dy \, dx$
1d
reviewed Close An Infinite series I
1d
reviewed Leave Open About the integral $\int_{-1}^1 \frac{1}{\pi^2+(2 \operatorname{arctanh}(x))^2} \, dx=\frac{1}{6} $
1d
reviewed Leave Open Can $\int_{0}^{1}\frac{x^{p}\ln^{q}(x+a)}{(x+a)^{b}}dx$ be expressed in a simple form?
1d
reviewed Close How does rotational energy transfer to linear energy?
1d
reviewed Leave Open Convergence of $X_{n+1}=A X_n+C$.
1d
reviewed Leave Open Help needed with the integral of an infinite series
1d
reviewed Close Find the centre, foci and asymptotes of the hyperbola
1d
reviewed Leave Open A non-standard form of circle in the complex plane
1d
reviewed Leave Open Is 1 + 1 + 1 … a finite number?
1d
reviewed Leave Open Find the sum of the series $\sum \frac{1}{n(n+1)(n+2)}$
1d
reviewed Close Does number precede structure?
1d
reviewed Leave Open Line Integral: $\int_C{x^2}\:dy$
1d
answered Why formulate continuity in terms of pre-images instead of image?
1d
comment Why is it true that $(a_1, a_2, \dots, a_r) = (a_1, a_r)(a_1, a_{r-1})\dots(a_1, a_3)(a_1, a_2)$?
I somehow feel that this question has been altered beyond recognition, which makes older answer look inadequate ...
2d
comment The product of two prime numbers
Well, if the product has at least three factors ...
2d
comment Why does Lie algebra of affine group have two components?
In short, we are talking about the tangential space of a product space, which is the product of the tangential spaces
2d
answered Why is it true that $(a_1, a_2, \dots, a_r) = (a_1, a_r)(a_1, a_{r-1})\dots(a_1, a_3)(a_1, a_2)$?
2d
comment Does there exist a $z\in \Bbb R$ such that $\sin z=t \in \Bbb T$?
How about $\sin 1$, or in fact $\sin x$ for any $x\in\mathbb Q\setminus\{0\}$?