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  • 14 votes cast
Apr
8
revised Subgroups of $GL(2, \Bbb{R})$
added 41 characters in body
Apr
8
comment Subgroups of $GL(2, \Bbb{R})$
That was a typo, I meant a proper subgroup of $GL(2,\Bbb{R})^+=\{a \in GL(2, \Bbb{R}):\ \det(a)>0\}$.
Apr
8
asked Subgroups of $GL(2, \Bbb{R})$
Apr
6
comment $\mathbb{R}^2$ as a quotient of a group
Thanks for the first example, but the second example is homeomorphic to the product of $\mathbb{R}^2$ with a singleton.
Apr
6
accepted $\mathbb{R}^2$ as a quotient of a group
Apr
6
comment $\mathbb{R}^2$ as a quotient of a group
I fixed that! I meant as two topological sets they are homeomorphic.
Apr
6
revised $\mathbb{R}^2$ as a quotient of a group
I replaces "in a bijection relation" by "homeomorphic".
Apr
6
asked $\mathbb{R}^2$ as a quotient of a group
Mar
1
accepted Transpose in $ {SL}(2,\mathbb{R})$
Mar
1
revised Transpose in $ {SL}(2,\mathbb{R})$
edited tags
Mar
1
asked Transpose in $ {SL}(2,\mathbb{R})$
Jul
16
accepted Sum by twos for functions on $\Bbb{Z}$
Jul
16
awarded  Commentator
Jul
16
revised Sum by twos for functions on $\Bbb{Z}$
added 11 characters in body
Jul
16
comment Sum by twos for functions on $\Bbb{Z}$
by `sum by twos' I mean exactly the thing that brogrenkp said. And I fix the error in the question.
Jul
16
revised Sum by twos for functions on $\Bbb{Z}$
edited tags
Jul
16
asked Sum by twos for functions on $\Bbb{Z}$
Jul
15
awarded  Revival
Jul
12
comment Positive Semi-Definite matrices and subtraction
@Martin Argerami: If $A=(a_{i,j})_{i,j=1}^n$ and $B=(b_{i,j})_{i,j=1}^n$ are two positive semidefinite matrices with real values and $a_{i,j}\geq b_{i,j} \geq 0$ for every $i,j$. Can we say anything about $A-B$?
Jul
7
awarded  Editor