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Nonasympototic version of Gelfand's formula
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Jan
16 
answered  Nonasympototic version of Gelfand's formula 
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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 
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Solving a system of equations using Gröbner basis
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12 
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Solving a system of equations using Gröbner basis
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Jan
12 
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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 
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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 
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Injectivity of a multivariate homogeneous polynomial mapping
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23 
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Injectivity of a multivariate homogeneous polynomial mapping
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Sep
23 
answered  Injectivity of a multivariate homogeneous polynomial mapping 