2,258 reputation
315
bio website marocprepa.com
location Salé, Morocco
age
visits member for 2 years, 6 months
seen yesterday

Teacher of mathematics in preparatory classes for engineering schools, center of Salé, Morocco.

I just discovered this site and I see an excellent way to:

  • Improve my knowledge.

  • Find sources which are used to make exercises for my students.

  • Meet famous professors and students from various countries of the world.

  • Help by giving answers or comments when I can.

I note that my mother tongue is Arabic, so if I speak bad English, all corrections of my mistakes will make me happy.


Dec
9
reviewed Approve Verify question about complements
Dec
9
awarded  Caucus
Dec
1
comment A4 has no subgroup of order 6
an other way : $\mathcal A_4$ has 8 as number of it's 3-cycles.
Nov
4
comment Intro to Proofs: Continuity
Yes: if $\varepsilon > 0$, take $\delta=\frac{\varepsilon}{c}$
Nov
2
reviewed Approve Inequality about complex plane.
Oct
31
reviewed Approve nonnegative finite-valued Borel measurable function that is not $\sigma$-finite.
Oct
31
reviewed Approve Trying to solve this system with Gauss-Seidel
Oct
23
reviewed Approve Find the singular value decomposition for the following matrix and try to use the decomposition to create a sketch of the range in R3?
Oct
20
reviewed Approve An identity about Dirichlet $\eta$ Function
Oct
20
answered What is a cartesian equation for 3 space passing through 3 points?
Oct
19
reviewed Approve $3$ different balls placed randomly in potentially $3$ different initially empty boxes.
Oct
15
comment Show that $\gcd(3n,3n+ 2) = 1$ when $n$ is odd
$gcd(3n,3n+2)=gcd(3n,2)$
Oct
15
reviewed Approve Prove the map has a fixed point
Oct
15
answered Existence of homomorphism between two groups
Oct
11
accepted Norms for which every subset of closed unit ball containing the open unit ball is convex
Oct
11
reviewed Approve Countable product of Polish spaces
Oct
10
reviewed Approve notation of differentiation in differential geometry
Oct
10
comment Show that $\sigma(S(C))=\sigma(C)$.
See the definition of $\sigma-$algebra: Let $E$ a set and $P(E)$ the set of subsets of $E$. A $\sigma-$algebra is a subset $\cal A$ of $P(E)$ such that ...
Oct
10
comment Invertible: A non-square matrix?
Ye If a family $\mathcal B$ is a base of $\Bbb R^n$ the matrix of $\cal B$ in the canonical base of $\Bbb R^n$ is a $n \times n$ square matrix , conversely a square $n \times n$ matrix $M$ has coloumns of a base of $\Bbb R^n$ if and only if $\det(M)\neq 0$
Oct
10
comment Show that $\sigma(S(C))=\sigma(C)$.
when you have a subset $C$ of $P(E)$ such that $C$ in not yet a $\sigma-$algebra, you have to add a minimum of elements to $C$ using a certain method to get a $\sigma-$algebra.When $C$ is already a $\sigma-$algébra there is nothing to add.