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Jun
27
comment Homology of $S^2/x\sim -x$ for $x$ on the equator
What are $P^i$?
Jun
17
revised realizing/ understanding $C^*(\phi_g(C([0,1])))$ and "support projection of an element of a $C^*$-algebra
added 63 characters in body
Jun
3
answered Bott projection
Jun
2
comment universal C* algebras
Interestingly, the universal Cstar algebra generated by a partial isometry is apparently quite horrible: ams.org/journals/proc/2012-140-01/S0002-9939-2011-10988-2/…
May
29
revised Why is the 3D case so rich?
added 1 character in body
May
28
awarded  Nice Answer
May
18
answered Injective implies invertible? Injective and well-defined implies bijective?
Apr
9
answered Is the pair $(\{0,4,8,12\},+_{16})$ consist a Group?
Apr
9
comment Is the pair $(\{0,4,8,12\},+_{16})$ consist a Group?
@Omnomnomnom It's a pair consisting of a set and a binary operation.
Apr
5
comment Fastest way to meet, without communication, on a sphere?
You are right. $ $
Apr
4
comment Fastest way to meet, without communication, on a sphere?
The two could be on non-intersecting orbits like northern and southern polar circles.
Apr
4
comment Cantor set + Cantor set =$[0,2]$
set = number ?!
Mar
26
comment Does there exists an automorphism of $\Bbb{C}$ that's also an exponential hom?
What is $z^w$ ?
Mar
23
comment realizing/ understanding $C^*(\phi_g(C([0,1])))$ and "support projection of an element of a $C^*$-algebra
Btw, it is not ideal to put two rather unrelated questions into one post. You might consider posting your second question separately.
Mar
23
comment realizing/ understanding $C^*(\phi_g(C([0,1])))$ and "support projection of an element of a $C^*$-algebra
No, but, as you see from my answer, the case where $g$ is invertible is not very interesting.
Mar
23
answered realizing/ understanding $C^*(\phi_g(C([0,1])))$ and "support projection of an element of a $C^*$-algebra
Mar
23
comment realizing/ understanding $C^*(\phi_g(C([0,1])))$ and "support projection of an element of a $C^*$-algebra
1) Warning: your map $\phi_g$ is not a homomorphism. 2) You allow that $g$ takes the value $0$ at some places, don't you?
Mar
20
comment A question in Banach space
cross posted: mathoverflow.net/questions/200515/a-question-in-banach-space
Mar
14
comment preserving problem
You can easily write down a dense set of bump functions.
Mar
13
answered preserving problem