Robert Mastragostino
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 Apr 11 awarded Yearling Mar 23 awarded Nice Answer Mar 2 awarded Nice Answer Feb 16 awarded Nice Question Feb 10 revised Real life applications of general vector spaces fixed confusing grammar and half-sentences. Feb 9 awarded Custodian Feb 9 reviewed Leave Open How did the rule of addition come to be and why does it give the correct answer when compared empirically? Feb 9 reviewed Close Counting and Abstract Problem Solving Feb 9 reviewed Leave Open Monotone convergence and uniform integrability: an application. Jan 28 revised What are the practical applications of the Taylor Series? added 7 characters in body Jan 28 comment Show that in a discrete metric space, every subset is both open and closed. @Khallil that is also true, by the definition of 'closed'. But the complements are open as well here, since all sets are open. My point was to make the transition from "all sets are open" to "all sets are complements of open sets, and therefore closed as well". Jan 25 awarded Popular Question Oct 25 comment Relation between $SO(n)$ and rotations I guess I'm confused about the question. Rotations should be the operations which have a fixed center, do not flip orientation, and are rigid body transformations, which are precisely the properties used when defining $SO(n)$. Would you like a proof that such an operation can always be decomposed into a collection of 2D rotations around multiple planes (with one fixed axis in odd dimension)? Sep 21 awarded Popular Question Sep 3 awarded Enlightened Sep 3 awarded Nice Answer Aug 26 awarded Guru Jul 23 answered Why there is no sign of logic symbols in mathematical texts? Jun 23 comment Electrostatic capacity of two spheres with changing radii The problem might simplify in the appropriate choice of bispherical coordinates, where you the choose coordinate system so that both spheres are level sets. The potential is a solution of Laplace's equation in the space outside the conductors, which is separable in bispherical coordinates. Jun 19 accepted Why are there only limits and colimits?