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Mar
5
comment What is series coefficient for $f(x)=\csc^2 x - \frac1{x^2}$?
I already found the answer to this question: math.stackexchange.com/questions/699611/…
Mar
5
comment Why this function is elementary and its pair is not?
@vonbrand the first one is $\csc^2 x - \frac1{x^2}$, the second one can only be explained using polygamma or Hurwitz zeta.
Mar
5
comment Zero to the zero power - Is $0^0=1$?
One does not exclude the other, this can be both indeterminate form when considering limits, AND defined.
Mar
5
awarded  Citizen Patrol
Mar
4
asked Why this function is elementary and its pair is not?
Mar
4
asked What is series coefficient for $f(x)=\csc^2 x - \frac1{x^2}$?
Mar
4
comment Given an even function how to obtain the most close odd function and vise versa?
@user86418 tanh(nx) is not discrete-analytic for large enough n, see here for a similar case: mathoverflow.net/questions/99166/…
Mar
4
revised Given an even function how to obtain the most close odd function and vise versa?
added 67 characters in body
Mar
4
comment Given an even function how to obtain the most close odd function and vise versa?
@user86418 thanks, I have addressed this.
Mar
4
revised Given an even function how to obtain the most close odd function and vise versa?
added 252 characters in body
Mar
4
revised Given an even function how to obtain the most close odd function and vise versa?
added 6 characters in body
Mar
4
revised Given an even function how to obtain the most close odd function and vise versa?
added 84 characters in body
Mar
4
asked Given an even function how to obtain the most close odd function and vise versa?
Feb
12
asked Prove that when converge, the following expansions are equal
Jan
30
awarded  Popular Question
Jan
8
comment How is called the class of functions whose inverse function is a polynomial?
@Karene I doubt that inverse to any algebraic function is a polynomial.
Jan
8
asked How is called the class of functions whose inverse function is a polynomial?
Nov
7
asked Proof that Newton expansion over derivatives has the properties of an integral
Nov
7
asked Does the series $\sum(-1)^k\binom{x}{k}$ converge for -1<x<0?
Nov
6
comment Is there an example of an analytic function whose derivative is not analytic?
What about real analysis?