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visits member for 2 years, 3 months
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3h
answered Erroneous calculus of variations reference in V. I. Arnold's Mathematical Methods of Classical Mechanics?
5h
answered Insightful books on differential equations?
Jul
22
comment how to find matrix from its exponential form
Plug in $t=0$? $ $
Jul
22
reviewed Reject suggested edit on $ d(x,y)^2 \le d(x,z)^2 - d(y,z)^2\color{}{+\varphi\big(x,y,z,d(x,y),d(y,z) \big)}? $
Jul
22
reviewed Approve suggested edit on examples on metric space on set of natural numbers
Jul
22
reviewed Approve suggested edit on Find a basis of $A = (\{1, \sin(x), (\cos)^2(x), (\sin)^2(x)1\})$ and determining its dimension.
Jul
22
reviewed Approve suggested edit on Integral $\int_{0}^{\pi/2} \arctan \left(2\tan^2 x\right) \mathrm{d}x$
Jul
20
reviewed Approve suggested edit on Check if a given function is a probability density function
Jul
20
reviewed Approve suggested edit on Let $A$ be an $n \times n$ matrix with real entries.
Jul
20
reviewed Approve suggested edit on Jordan chain when matrix has only one eigenvalue.
Jul
20
comment Soviet Russian Mathematical Books
@Assad Publisher MIR ("World") is more famous with translations into Russian of many classics in mathematics. It turns out that some books published in Russian in MIR have better quality than the original (due to higher typographic standards and very careful work of editors). They also known as publishing translations of Russian books into English, but I was never fan of this because I think that a translation has to be made by a native speaker, which was not the rule for MIR.
Jul
20
reviewed Approve suggested edit on To Prove $x'Ax=\mathrm{tr}(xAx')=\mathrm{tr}(Axx')=\mathrm{tr}(xx'A)$
Jul
20
reviewed Approve suggested edit on Power Series Convergence comparison
Jul
18
reviewed Reject suggested edit on Is there a way to use the Generalized Mean to find the “best” possible mean to use for a specific data set?
Jul
18
reviewed Reject suggested edit on For $f$ continuous, show $\lim_{n\to\infty} n\int_0^1 f(x)x^n\,dx = f(1).$
Jul
17
reviewed Approve suggested edit on Prove $(1-x)^{2k+1} \sum\limits_{n\ge 0}\binom{n+k-1}{k}\binom{n+k}{k} x^n = {\sum\limits_{j\ge 0} \binom{k-1}{j-1}\binom{k+1}{j} x^j} $
Jul
16
reviewed Approve suggested edit on Definition of Rational/ Irrational Numbers reguarding denominators
Jul
16
reviewed Approve suggested edit on Prove that the given congruence modulo m is an equivalence relation
Jul
15
reviewed Reject suggested edit on Linear Algebra - Question about transformation and characteristic polynomial
Jul
15
reviewed Approve suggested edit on Logarithmic equations with different bases