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Jul
11
answered How many tagged partitions of an interval are there?
Jul
11
comment How to prove these 2 matrix problems?
You can't divide by $H$, as $H$ is a matrix. The very definition of $f'(A)$ is that it is a linear map and $$ f(A+H) = f(A) + f'(A)H + o(\|H\|), \quad H \to 0 $$ Now $f(A+H) - f(A) = \Tr(HB)$, now $\Tr(HB)$ is linear in $H$, hence $f'(A)H = \Tr(HB)$.
Jul
11
answered How to prove these 2 matrix problems?
Jul
11
answered Proof on limit superior and limit inferior of a set
Jul
11
revised Proof on limit superior and limit inferior of a set
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Jul
11
answered E is bounded if and only if every countable subset of it is bounded
Jul
11
answered p-norm of a function
Jul
11
answered solving the number of boys who are left handed
Jul
11
revised solving the number of boys who are left handed
replaced image by TeX.
Jul
11
answered The equality of gradient between different calculations?
Jul
10
reviewed No Action Needed Probability generating function for negative values of random variables?
Jul
10
reviewed Reject Alternating Series Divergence
Jul
10
reviewed No Action Needed Is this a Fourier transformation?
Jul
10
reviewed Approve is bounded partial derivative continous
Jul
10
reviewed Approve Alternating Series Divergence
Jul
10
reviewed Approve How to create circles and or sections of a circle when the centre is inaccessible
Jul
10
reviewed Reviewed Proof that if $a_1=1$ and $a_{n+1}=1+\frac{1}{1+a_n}$
Jul
10
reviewed Approve Binary relation, reflexive, symmetric and transitive
Jul
10
answered Integral values and reducibility of fractions
Jul
10
answered Integral limit of $\sin(x/n)f(x)$