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visits member for 3 years, 2 months
seen Jul 27 at 11:50

Mar
19
comment What are the connections between spectral expansion and differential operator?
@muzzlator Thanks for the comments! Yes, I know the spectral expansion facilitates solving differential equation, but is it the only motivation? (Just kidding: I myself find it easier to differentiate $x$ than to first write its Fourier expansion and then differentiate the expansion...)
Mar
19
asked What are the connections between spectral expansion and differential operator?
Mar
10
comment Is this a dirac delta function?
Can I ask how to evaluate the second integral in you post?
Feb
19
accepted Convergence of a particular double series
Feb
19
comment Convergence of a particular double series
Thanks for the clean approach!
Feb
19
asked Convergence of a particular double series
Feb
18
accepted $C^k$ norm for functions of several variables
Feb
18
asked $C^k$ norm for functions of several variables
Feb
14
accepted Computing an integral in spherical coordinates
Feb
13
asked Computing an integral in spherical coordinates
Dec
15
comment Equivalent condition for a vector space to be finite dimensional
Thanks! Clean proof.
Dec
15
accepted Equivalent condition for a vector space to be finite dimensional
Dec
15
revised Equivalent condition for a vector space to be finite dimensional
added 4 characters in body
Dec
15
comment Equivalent condition for a vector space to be finite dimensional
@froggie Thanks! You are absolutely correct.
Dec
15
asked Equivalent condition for a vector space to be finite dimensional
Dec
11
accepted Example of non-unique-factorization in $\mathbb{Z}+x \mathbb{Q}[x]$.
Dec
11
asked Example of non-unique-factorization in $\mathbb{Z}+x \mathbb{Q}[x]$.
Nov
15
accepted How to find the coefficient of this Fourier sine series?
Nov
13
revised How to find the coefficient of this Fourier sine series?
added 2 characters in body
Nov
13
asked How to find the coefficient of this Fourier sine series?