# Samuel T

Geneva

Age: 25

I'm currently a PhD student in theuniversity of Geneva. For the moment, I work mainly in algebraic topology.

 Mar 20 awarded Yearling Mar 20 awarded Yearling Aug 24 awarded Scholar Aug 24 comment Displaying [ ], |, etc. in a TikZ matrix nodeThank you for this great, complete answer ! Aug 24 accepted Displaying [ ], |, etc. in a TikZ matrix node Aug 24 comment Displaying [ ], |, etc. in a TikZ matrix nodeThank you percusse, this worked (and I feel like an idiot, but that's not a problem). Do you want to make an answer out of that, or should I make it ? Aug 24 awarded Editor Aug 24 awarded Student Aug 24 revised Displaying [ ], |, etc. in a TikZ matrix nodeadded 846 characters in body Aug 24 answered Boundary points Aug 24 asked Displaying [ ], |, etc. in a TikZ matrix node Aug 24 awarded Supporter May 8 awarded Commentator May 8 comment How much connection is there between Commutative Algebra and Algebraic Topology?And for a slightly less cheap example, the cohomology of the total space of a fiber bundle is a module over the cohomology of the base space. May 8 answered How much connection is there between Commutative Algebra and Algebraic Topology? May 8 comment orthogonal projection - simple exalanation neededTo make this example even more concrete, let $D$ be $\mathbb{R}^2=\{(x,y)\}$ and $D'=\{(x,y)\in\mathbb{R}^2|y=0\}$. Now the orthogonal projection of $D$ on $D'$ is the map that sends any pair $(x,y)$ to the pair $(x,0)$. May 3 answered Surjective graded homomorphism of rings also an isomorphism? May 3 comment Surjective graded homomorphism of rings also an isomorphism?This doesn't work : the natural projection homomorphism is not a graded morphism (e.g. $t^{k+1} \mapsto t$ lowers the degree by $k$. Apr 30 answered Is a metric on a metric space a bilinear form? Apr 20 answered Converting decimal number to a hexadecimal number