27 Answers votes newest views recent 6Tools for collaborative paper-writing 10(Preferably rare) Audio/Video recordings of famous mathematicians? (2) 4Tools for long-distance collaboration 4Why is cotangent more canonical than tangent? 3What is a Lagrangian submanifold intuitively? 0Are there any good computer programs for drawing (algebraic) curves? 3How can I find the average of two 2D curves? 4Jet bundles and partial differential operators 2How to classify the algebras C^∞(M)? 1reference for Noether’s theorem 6An elementary but confusing question in differential geomerty 6On the proof of the hamiltonian flow box theorem 4smooth Gelfand-duality 1How to motivate and interpret the geometric solutions of Hamilton-Jacobi equation? 1Geometry and Integrability in Other Bundles 1Symplectic structures from Lagrangians? 1Differential ideal membership problem 2Differential between tangent sheaves 4$D_X$ algebras, $D_X$ schemes, connections 8What are the computationally useful ways of thinking about Killing fields? 1Hypersurfaces orthogonal to a cone 2module of sections of the horizontal bundle 31-jet bundle on vector bundle with metric connection 2Does a smooth, constant-rank, integrable distribution have a basis in which the traces of the structure constants are the divergences of the corresponding basis elements? 1Smooth functions tangent to the leaves of a foliation 1quasi-separated manifolds 2How to characterize the dual of an isotropic hyperplane?