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 Apr 10 answered Finding the volume of a cube using spherical coordinates Mar 30 revised Why is the delta function the continuous generalization of the kronecker delta and not the identity function? added 4 characters in body Mar 30 revised Why is the delta function the continuous generalization of the kronecker delta and not the identity function? added 4 characters in body Mar 30 comment Why is the delta function the continuous generalization of the kronecker delta and not the identity function? @Qmechanic: I mean multiplication. Mar 30 revised Why is the delta function the continuous generalization of the kronecker delta and not the identity function? added 190 characters in body Mar 30 comment Why is the delta function the continuous generalization of the kronecker delta and not the identity function? @Qmechanic: What I mean is the map/operator $x -> x$ can be represented as scalar number "1" in the sense that $x*1 = x$. Mar 20 answered Computing the limits of integration when doing a nontrivial coordinate transform Mar 20 comment What are curves (generalized ellipses) with more than two focal points called and how do they look like? This link is also interesting: en.wikipedia.org/wiki/Generalized_conic#Multifocal_oval_curves Mar 15 comment Computing the limits of integration when doing a nontrivial coordinate transform Maybe related: math.stackexchange.com/questions/7807/… Mar 13 asked Computing the limits of integration when doing a nontrivial coordinate transform Mar 10 comment Do functional integrals have countable or uncountable infinite dimensions? Thanks. I followed that link and found that in in chapter 2.1.2 of users.physik.fu-berlin.de/~kleinert/b5/psfiles/pthic02.pdf they say one takes a "continuum limit" from an expression with a product symbol to get a path integral. I guess that means that functional integrals (at least for path integrals) have uncountable infinite dimensions. Mar 7 asked Do functional integrals have countable or uncountable infinite dimensions? Mar 6 asked Multiplicative even and odd functions? Feb 29 awarded Critic Feb 27 asked Can one define an uncountable infinite product? Feb 23 revised Why is the delta function the continuous generalization of the kronecker delta and not the identity function? Added clarification Feb 22 asked Why is the delta function the continuous generalization of the kronecker delta and not the identity function? Feb 17 asked Can one define a cross product for functions? Feb 17 asked Is there a name for the “antisymmetric Cauchy-Schwarz inequality”? Feb 9 accepted Calculus over integers for derivative/integral of factorial?