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9h
accepted Nonlinear operator sends bounded set to relatively compact set
2d
answered Is $(\mathbb{Z}_4, +_4)$ isomorphic to $(\langle i\rangle, *)$
Feb
7
comment Nonlinear operator sends bounded set to relatively compact set
How do we ensure the same $M$ works for all the $v\in B$?
Feb
7
asked Nonlinear operator sends bounded set to relatively compact set
Feb
3
comment Example of Spherical Element (Simplicial Homotopy)
Thanks! I think I am starting to get it. So if $x$ is spherical, all the vertices and edges of $x$ are identified into a single point? By your answer that is a sufficient condition, is it also a necessary condition?
Feb
3
accepted Example of Spherical Element (Simplicial Homotopy)
Feb
1
comment Example of Spherical Element (Simplicial Homotopy)
I missed out the key word "fibrant" or Kan complex. So $X$ is a simplicial set with a choice of a basepoint, it is also fibrant (Kan complex).
Feb
1
revised Example of Spherical Element (Simplicial Homotopy)
added 8 characters in body
Feb
1
asked Example of Spherical Element (Simplicial Homotopy)
Jan
28
accepted Form of elements in closed linear span
Jan
28
comment Form of elements in closed linear span
Thanks, can you elaborate a bit on how to use Bessel's inequality? When I tried using it I got $\sum|\langle x,x_j\rangle|^2\leq\|x\|^2$
Jan
27
asked Form of elements in closed linear span
Jan
27
comment Fibrant (Kan complex) geometric meaning
Thanks for introducing Friedman's paper
Jan
27
asked Fibrant (Kan complex) geometric meaning
Jan
26
comment Matching faces in Simplicial Set theory
@Zhenlin In other words, they are "adjacent" or "touching each other"?
Jan
26
asked Matching faces in Simplicial Set theory
Jan
26
asked Sequence of sequence Best notation (Functional Analysis)
Jan
25
awarded  Famous Question
Jan
25
comment How did Von Neumann think of the formula for scalar product?
@littleO thanks I get it now
Jan
25
revised How did Von Neumann think of the formula for scalar product?
edited body