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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