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 Oct 14 revised Can a disconnected surface have a (negative) genus? edited body Oct 12 revised Can a set be neither open nor closed? added 3 characters in body Aug 24 revised Show that there is no function $\phi\in C^2(\mathbb R^3,\mathbb R)$ such that $\nabla \phi=(-y,x,0)^t$ added 2 characters in body Aug 24 revised Show that there is no function $\phi\in C^2(\mathbb R^3,\mathbb R)$ such that $\nabla \phi=(-y,x,0)^t$ title edited Jun 2 revised Show that there is no function $\phi\in C^2(\mathbb R^3,\mathbb R)$ such that $\nabla \phi=(-y,x,0)^t$ deleted 44 characters in body Feb 7 revised Homotopy of a (non-spherical) cow. deleted 518 characters in body Feb 7 revised Homotopy of a (non-spherical) cow. deleted 518 characters in body May 23 revised How to express $2 \cos X = \sin X$ in terms of $\sin X$? added a tag Jan 23 revised Is length adimensional when space is not flat? added 209 characters in body Jan 23 revised Describing the algebra of functions on $S^2$ added 39 characters in body Jan 23 revised Describing the algebra of functions on $S^2$ added 39 characters in body Jan 23 revised Is length adimensional when space is not flat? added 1 characters in body Jan 22 revised Is length adimensional when space is not flat? added 15 characters in body Jan 22 revised Is length adimensional when space is not flat? added 234 characters in body Jan 22 revised Is length adimensional when space is not flat? added 234 characters in body Jan 22 revised Is length adimensional when space is not flat? added 140 characters in body Jan 22 revised Is length adimensional when space is not flat? added 277 characters in body Jan 14 revised two identical point charges can't collide added $n=2$ case. Jan 13 revised two identical point charges can't collide added 196 characters in body Jan 11 revised Metric tensor of complex numbers & Hamiltonian Mechanics added info