Stack Exchange

Najib Idrissi

Paris, France

https://idrissi.eu

Hi! I'm a mathematician. My main mathematical interests are within algebraic topology and operad theory. I am studying applications of operads, and in particular the little disks operads, to the study of configuration spaces of manifolds. I am a maître de conférences at Université de Paris and a member of the Algebraic Topology & Geometry team of the Institut de Mathématiques de Jussieu-Paris Rive Gauche.

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Top Questions

What does "K+M+B 2016" mean in when written on a church wall?

religion czech-republic prague asked Aug 28, 2016 at 10:26

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Have there been (successful) attempts to use something other than spheres for homotopy groups?

algebraic-topology homotopy-theory asked Oct 5, 2015 at 13:19

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What is quantum algebra?

qa.quantum-algebra terminology quantum-groups asked Jan 12, 2018 at 9:08

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What should I cite for the Poincaré conjecture?

dg.differential-geometry smooth-manifolds 3-manifolds citations asked Jul 26, 2016 at 6:58

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When is there a ring structure on an abelian group $(A,+)$?

abstract-algebra ring-theory asked Jun 30, 2013 at 8:46

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What are examples when the equality of some invariants is good enough in algebraic topology?

at.algebraic-topology big-list examples asked Sep 18, 2015 at 12:00

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If $S^1 \hookrightarrow X$ induces an injection of $H_1$, then $X$ retracts onto $S^1$

algebraic-topology obstruction-theory asked May 11, 2013 at 12:12

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Tangent bundle of a quotient by a proper action

differential-geometry vector-bundles projective-space asked Apr 14, 2013 at 9:39

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Why is the recognition principle important?

algebraic-topology homotopy-theory loop-spaces operads asked Jun 28, 2012 at 10:06

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Is $\mathbb{R}^n$ properly homotopy equivalent to $\mathbb{R}^m$ if $n \neq m$?

algebraic-topology compactness homotopy-theory asked Jun 8, 2015 at 9:13

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Top Answers

Why do some GDPR emails require me to opt-out and some to opt-in?

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How to put 9 pigs into 4 pens so that there are an odd number of pigs in each pen?

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Why is $\text{Hom}(V,W)$ the same thing as $V^* \otimes W$?

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Misguided use of offensive figures in student presentations

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The "magic diagram" is cartesian

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Square of a second derivative is the fourth derivative

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Can this be considered a "rigorous" definition of a limit?

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Applications of Eckmann–Hilton argument

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If a topological space is homeomorphic to a smooth manifold, then will it be a smooth manifold?

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Motivation for the mapping cone complexes

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If a nonempty set of real numbers is open and closed, is it $\mathbb{R}$? Why/Why not?

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Is the set of non invertible matrices simply connected? What are their homotopy and homology groups?

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What is the motivation for semidirect products?

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bijective homomorphisms between non isomorphic posets, example , explanation needed

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A fiber bundle over Euclidean space is trivial.

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Rank-nullity theorem for free $\mathbb Z$-modules

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If $f$ is continuous at $a$, is it continuous in some open interval around $a$?

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Is homology with coefficients in a field isomorphic to cohomology?

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What are the irreducible representations of the cyclic group $C_n$ over a real vector space $V$?

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Abelianization of free group is the free abelian group

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As an evaluator in mathematics, how should I grade responses that answer the question asked, but in less detail than desired?

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Prove: The weak closure of the unit sphere is the unit ball.

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The loop space of the classifying space is the group: $\Omega(BG) \cong G$

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If $\sum_{n = 1}^\infty {{a_n}}$ converges, then is $\sum_{n = 1}^\infty (1+a_n)^{-1}$ a convergent series?

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Is there a onto group homomorphism from $\Bbb Q$ to $\Bbb Z$?

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Constant maps induce zero homomorphism

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Is a group homomorphism a module homomorphism?

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Sum of $\cos(k x)$

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Does Koszul duality between $Comm$ and $Lie$ imply the power series identity $\exp(\ln(1-z))-1 = -z$?

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$U^*\otimes V$ versus $L(U,V)$ for infinite dimensional spaces

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