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I love mountainbike. I hate the Matrix Cookbook.


Dec
5
answered Calculating the dimension of the algebra generated by some given matrices
Dec
1
revised Rank 1 Approximation of Elementwise Inverse Matrix
added 26 characters in body
Dec
1
answered Rank 1 Approximation of Elementwise Inverse Matrix
Nov
28
comment Resolvent of a triangular matrix
In my mind "no kidding"="is it a joke ?", that is about the Michele's sentence: " where $p_A$ is the characteristic polynomial of $A$, which is easy to compute once we know an eigendecomposition of A"; that is funny when one knows that $A$ is a triangular matrix. This seems to me absolutely innocuous. Compare with "Récoltes et semailles", the book written by Grothendieck; at least, read the introduction (chapter 0).
Nov
28
revised Resolvent of a triangular matrix
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Nov
27
revised Resolvent of a triangular matrix
added 569 characters in body
Nov
26
answered Resolvent of a triangular matrix
Nov
26
comment Unitary factor in polar decompositions
@ Lin , I don't think so ; yet even if $-1$ is never an eigenvalue, that does not imply that $C_n<2$ because $C_n$ may be a LimitSup.
Nov
26
answered Characterizing space that preserves positive-definiteness property
Nov
25
revised Unitary factor in polar decompositions
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Nov
25
answered Unitary factor in polar decompositions
Nov
19
awarded  Revival
Nov
19
revised LU factorization for $I+A$ (A skew-symmetric)
added 429 characters in body
Nov
19
revised LU factorization for $I+A$ (A skew-symmetric)
added 19 characters in body
Nov
18
revised LU factorization for $I+A$ (A skew-symmetric)
added 210 characters in body
Nov
18
revised LU factorization for $I+A$ (A skew-symmetric)
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Nov
18
answered LU factorization for $I+A$ (A skew-symmetric)
Oct
12
revised spectrum of a special class of tridiagonal matrices
added 372 characters in body
Oct
12
revised spectrum of a special class of tridiagonal matrices
edited body
Oct
12
revised spectrum of a special class of tridiagonal matrices
added 114 characters in body