Solved problems
Rådström cancellationEigenvalues of positive matrices-automorphisms of Polynomials that induce a surjectionField extensions of of degree 2Group of -automorphismsMatrices with a diagonalizable powerOne of them is invertibleRational power of 2Interior of a vector subspaceEigenvalues of orthogonal matricesPower of integersThe canonical inner product on real matricesThe park problemAn early estimate of in ancient Egypt1,2,3... Shoot !1 minute left for this integralThe Yoneda LemmaFunctor between integers with divisibility and groupsUne première définition géométrique de πFR