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Nov
23
comment Circle to circle homotopic to the constant map?
To get the extension do you apply some generalisation to $\mathbb R^2$ of Tietze's extension theorem?
Nov
23
awarded  Popular Question
Nov
21
awarded  Popular Question
Nov
21
revised Let H be a proper subgroup of G of order prime $p^k$ and $N(H) = \{a \in G|aHa^{-1} = H\}.$Show that $N(H) \neq H.$
edited tags
Nov
21
revised Using Fourier analysis to show a function is positive
typos corrected
Nov
18
comment Open and closed complex sets
Or one of the real parts was meant to be imaginary?
Nov
18
answered Complex number isomorphic to certain $2\times 2$ matrices?
Nov
16
comment $\left\{\,f\in L^1[0,1]\,\big\vert\,\int_0^1\lvert f\rvert^2>1\right\}$ is open
Wouldn't it be easier to show that the closed unit ball is sequentially closed?
Nov
16
comment Does a continuous point-wise limit imply uniform convergence?
@IlmariKaronen Thank you for your comment! This is a great answer. I hope it gets some more upvotes.
Nov
16
comment Does a continuous point-wise limit imply uniform convergence?
Do I understand correctly: $f_n$ looks like a triangle getting smaller at the base? (piecewise linear function)
Nov
6
revised About $\infty$-norm on the space of convergent sequences
rolled back to a previous revision
Nov
6
revised About $\infty$-norm on the space of convergent sequences
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Nov
5
comment Counterexample to the set of all algebraic polynomials being dense in $[0,1]$
I see. So I guess an algebraic polynomial is the same as a polynomial. : )
Nov
5
comment Counterexample to the set of all algebraic polynomials being dense in $[0,1]$
What is an algebraic polynomial?
Nov
5
answered Counterexample to the set of all algebraic polynomials being dense in $[0,1]$
Nov
3
awarded  Enlightened
Nov
3
awarded  Nice Answer
Oct
31
awarded  Popular Question
Oct
29
comment Showing that $f$ continuous
@sammath I added an open set proof.
Oct
29
revised Showing that $f$ continuous
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