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  • 0 posts edited
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  • 16 votes cast
Jun
2
comment Homotopy equivalence between finite, discrete topological spaces.
Without those words: If you count the number of path components, you get that a discrete space with m elements has exactly m path componentsand the number of path components is invariant under homotopy equivalence.
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