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 Yearling
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Jul
7
comment $0,1,0,1,0,1$… has only $2$ limit points
It's easy to find the limit points of a sequence $(s_n)$ if each $s_n$ is an integer. Try proving that if $(s_n)$ is a sequence of integers, then $x$ is a limit point of $(s_n)$ if and only if $x$ occurs infinitely often.
Apr
8
asked Formal proof that $N$ is the smallest infinite set
Mar
6
comment When can I paste together two homeomorphisms?
How can I use this condition to solve the Hatcher problem? I discovered the condition on my own, but still couldn't prove that it applies to the comb space.
Mar
5
asked When can I paste together two homeomorphisms?
Mar
3
accepted What is the mapping torus of f(theta)=2*theta on S^1
Mar
1
asked What is the mapping torus of f(theta)=2*theta on S^1
Feb
23
comment Will Steve the train engineer be mad?
You may be conflating train cars with "standard-size containers". 25 containers are loaded onto each train car.
Feb
6
accepted Is this plus sign a covering space of $S^1 \vee S^1$?
Feb
6
awarded  Yearling
Feb
6
asked Is this plus sign a covering space of $S^1 \vee S^1$?
Nov
8
answered Every question solved by one of two students
Nov
2
accepted Name for the set {Mv : |v| = 1}
Nov
1
asked Name for the set {Mv : |v| = 1}
Sep
26
accepted What is the 'type' of a natural transformation
Sep
25
asked What is the 'type' of a natural transformation
Sep
20
awarded  Popular Question
Aug
17
accepted Minimize $\cos(t)\cos(t-\alpha)$
Aug
17
asked Minimize $\cos(t)\cos(t-\alpha)$
Jul
2
awarded  Curious
Feb
12
accepted Why does linear dependence require a *finite* linear combination to vanish?