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12041
bio website jungenschaft-hohenstaufen.de
location Berlin, Germany
age 33
visits member for 2 years, 11 months
seen 5 hours ago

5h
comment Determinant of the linear map given by conjugation.
See also math.stackexchange.com/questions/275925/… where the case of conjugation on the whole of $M_n(K)$ is discussed
5h
comment Transformation matrix of a polynomial
You are welcome ...
6h
comment Convergence of an infinite power
Do you also want $w\ne 0$? Otherwise take $z = 2^{-1}$.
6h
answered Transformation matrix of a polynomial
6h
comment Why are those objects initial or final obejcts?
@Bryan261 Exactly. Now try the other ones.
6h
answered Totally disconnected measurable set with positive measure
7h
comment Why are those objects initial or final obejcts?
Ex falso quodlibet ... so if $P$ is any property, $\forall x \in \emptyset: P(x)$ is (vacuously) true.
7h
answered Recovering Unique Factorization
13h
answered Question about the existence of variables in different sets
17h
comment Rewriting the matrix equation $AX = YB$ as $Y = CX$?
As an addition note that as $\def\vec{\mathop{\rm vec}}\vec(AX) = (\def\Id{{\rm Id}}\Id \otimes A)\vec X$, $\vec(YB) = (B^t \otimes \Id)\vec Y$, that can help you to find $C$ for the vectorization
17h
revised Calculating dimension of subspace of all commutating matrices with fixed matrix A .
added 2 characters in body
18h
answered Inverse of an operator on two functions
1d
answered Why if $x>2 \sqrt x$, then $\sqrt x > 2$?
Jul
22
reviewed Leave Open An arithmetic sequence whose members do not contain the digit ‘9’
Jul
22
reviewed Leave Closed Find the function whose Taylor series is $\log(x)+\log(x+1)+\log(x+2)+\ldots$
Jul
22
reviewed Close Round trips on train
Jul
22
reviewed Close Maple Cubic Spline Interpolation
Jul
22
reviewed Leave Open Write the particular equation…Predict her speed
Jul
22
reviewed Close Taxpayers homework
Jul
22
reviewed Leave Open Induction proof involving sets