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 Oct 14 revised Can a disconnected surface have a (negative) genus? edited body Oct 13 asked Can a disconnected surface have a (negative) genus? Oct 12 revised Can a set be neither open nor closed? added 3 characters in body Oct 12 answered Can a set be neither open nor closed? Aug 24 awarded Excavator 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 Aug 24 suggested approved edit on Show that there is no function $\phi\in C^2(\mathbb R^3,\mathbb R)$ such that $\nabla \phi=(-y,x,0)^t$ Jan 4 accepted Dixmier-Douady class: computations Dec 19 awarded Caucus Nov 27 comment Is the translation of open and closed sets to some language non-antonym preserving? Interesting, thanks. Nov 27 asked Is the translation of open and closed sets to some language non-antonym preserving? Jul 2 awarded Curious Jun 5 awarded Yearling 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 Jun 2 answered Show that there is no function $\phi\in C^2(\mathbb R^3,\mathbb R)$ such that $\nabla \phi=(-y,x,0)^t$ Apr 16 comment Is this already an equation/law that has been found? I've only seen that attribution in "Die Vermessung der Welt". Feb 10 accepted Homotopy of a (non-spherical) cow. 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