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Jun
29
awarded  Famous Question
Oct
8
awarded  Popular Question
Jul
2
awarded  Curious
Jan
23
awarded  Nice Question
Jul
19
awarded  Notable Question
Dec
19
awarded  Popular Question
May
1
revised Vector, Hilbert, Banach, Sobolev spaces
deleted 1 characters in body
Aug
22
awarded  Yearling
Jul
29
accepted Do matrices with central symmetry form a group?
Jul
27
comment Do matrices with central symmetry form a group?
Expressing the set in the form $\mathcal{H} = \left\{ A : AJ = JA \right\}$, makes it much easier to prove that the inverse is also in the set since $J^{-1}=J$. Thanks!
Jul
27
revised Do matrices with central symmetry form a group?
edited title
Jul
27
comment Do matrices with central symmetry form a group?
Thanks. I edited the title.
Jul
27
comment Do matrices with central symmetry form a group?
Thanks for the lead. There is actually a paper dedicated to the inverse of such matrices jstor.org/stable/1267339
Jul
27
revised Do matrices with central symmetry form a group?
added 3 characters in body
Jul
27
revised Do matrices with central symmetry form a group?
change indexing in matrix
Jul
27
comment Do matrices with central symmetry form a group?
OK. I added the condition that $\det H >0$. Do they now form a group?
Jul
27
revised Do matrices with central symmetry form a group?
added 81 characters in body
Jul
27
asked Do matrices with central symmetry form a group?
Jul
20
accepted Symbol for elementwise multiplication of vectors
Jul
20
asked Symbol for elementwise multiplication of vectors