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awarded  Popular Question
Feb
3
awarded  Revival
Jan
16
revised Non-asympototic version of Gelfand's formula
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Jan
16
answered Non-asympototic version of Gelfand's formula
Jan
13
comment Solving a system of equations using Gröbner basis
@ user84881 , I do not know anyone who works on fields having such a big characteristic. Maple accepts only $char(K)\leq 2^{16}$. Can you write some words about your problem ?
Jan
12
revised Solving a system of equations using Gröbner basis
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Jan
12
revised Solving a system of equations using Gröbner basis
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Jan
12
revised Solving a system of equations using Gröbner basis
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Jan
11
answered Simultaneous special orthogonal similarity problem
Jan
11
answered Solving a system of equations using Gröbner basis
Dec
18
awarded  Revival
Dec
10
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Oct
29
comment Parameterize unitary without transpose
@ Robert Bryant , indeed the proof of Prop 2 is not straightforward. We show the result over $\mathbb{C}$ and, in a second step, over $\mathbb{R}$ along the same ideas you used. That was clear for me because I knew this characterization of $\sin,\cos$ since a long time. I adopted this presentation to highlight the geometric idea behind. Yes, the Kummer's result gives the surjectivity; moreover, 1. to read Kummer's proof is much easier than to study Cartan's theory. 2. I like this "story of maths" aspect.
Oct
29
comment Parameterize unitary without transpose
@ Sebastian SchlechtClearly , Prop. 1 and 2 can be independently proved. About a name for $V$, I don't know. In general, the authors consider elements of $V$ and not the whole set. cf also Horn and Johnson; Matrix Analysis, Section 4.6
Oct
29
revised Parameterize unitary without transpose
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Oct
29
answered Parameterize unitary without transpose
Oct
18
answered What is the time complexity of approximated SVD
Sep
23
revised Injectivity of a multivariate homogeneous polynomial mapping
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Sep
23
revised Injectivity of a multivariate homogeneous polynomial mapping
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Sep
23
answered Injectivity of a multivariate homogeneous polynomial mapping