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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?