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  • 0 posts edited
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  • 16 votes cast
May
27
answered If there is a finite-closed topology on $X$ with 3 clopen elements, then $X$ is finite
May
27
comment At which points is the following function differentiable
I wonder whether it is possible to choose other functions of $q$ (than $q^n$) so that the answer depends on the degree of the minimal polynomial of $x$...
May
27
comment At which points is the following function differentiable
I guess you meant $q^n|x-p/q| \rightarrow \infty$ as $p/q \rightarrow x$ (that is the denominator of the term whose limit gives the derivative).
May
26
asked At which points is the following function differentiable
May
7
awarded  Nice Question
Jan
28
awarded  Popular Question
Dec
9
awarded  Caucus
Oct
29
comment What happens if you follow the sun?
Usually Iwould also expect that you would go a little bit west every day. In the morning, you go east towards the sun and thus reach the point where the sun is directly above you some seconds before Mid-day. Then for the rest of the day you would go east. So every day you got a bit more to the west then to the east.
Jul
22
awarded  Yearling
Jul
21
revised Prove or disprove: if a set of 2d-points have symmetry axises, then at least one of the axises is eigenvector
added 199 characters in body
Jul
21
revised Prove or disprove: if a set of 2d-points have symmetry axises, then at least one of the axises is eigenvector
added 372 characters in body
Jul
21
answered Prove or disprove: if a set of 2d-points have symmetry axises, then at least one of the axises is eigenvector
Jul
2
awarded  Curious
Jun
3
accepted Number of surjections with injective restrictions
Jun
2
revised Number of surjections with injective restrictions
added 223 characters in body
Jun
2
comment Number of surjections with injective restrictions
@Bananarama: NO I think it is correct. Hopefully my edits will make this clear.
Jun
2
asked Number of surjections with injective restrictions
Feb
21
accepted Accumulation points of uncountable sets
Feb
21
revised Accumulation points of uncountable sets
edited body
Feb
21
asked Accumulation points of uncountable sets