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 Yearling
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Apr
24
reviewed Approve Generators for a matrix group
Apr
23
revised About projectors
added 91 characters in body
Apr
23
comment About projectors
@ Bernard I edited to explain what means $e$ (The Euler numbre: $2.71...$ )
Apr
23
revised About projectors
added 91 characters in body
Apr
23
comment About projectors
@Bepiop: The converse for me in the question is: conversly if $\exp(u)=\text{id}_E+(e-1)u$, is $u$ a projector? Thank's..
Apr
23
asked About projectors
Apr
21
revised Find an orthogonal matrix for a transformation from $\Bbb R^3$ to $\Bbb R^3$
added 112 characters in body
Apr
21
answered Find an orthogonal matrix for a transformation from $\Bbb R^3$ to $\Bbb R^3$
Apr
11
answered How do I find all $n × n$ matrices $C$ such that $CD = DC.$
Apr
10
revised Existance of a 3 x 3 matrix with zero trace, such that $A^2-A^t=I$
added 60 characters in body
Apr
10
revised Existance of a 3 x 3 matrix with zero trace, such that $A^2-A^t=I$
added 28 characters in body
Apr
10
answered Existance of a 3 x 3 matrix with zero trace, such that $A^2-A^t=I$
Jan
20
comment $G = \left\{1, -1\right\}$ is a group under multiplication
Associativity is : for all $(a,b,c) \in G^3$ we have $a\times(b \times c)=(a \times b) \times c$
Oct
20
comment About continuity of a linear forms in $\Bbb R[X]$
Thank's pjs36 for edit, but I think this question is also related to the analysis in a normed space (continuity of linear map, compactness, etc.)
Oct
19
revised About continuity of a linear forms in $\Bbb R[X]$
added 204 characters in body
Oct
19
asked About continuity of a linear forms in $\Bbb R[X]$
Jun
9
awarded  Yearling
Apr
27
revised A function with a bijection
added 1 character in body
Apr
27
reviewed Approve $\int_a^{b} f(x) dx$ exists then so does $\int_{a+c}^{b+c} f(x-c)dx$
Mar
17
awarded  Popular Question