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Nov
21
awarded  Nice Question
Nov
21
comment Open set U whose outer measure is less than A + epsilon
Thanks this is very helpful
Nov
21
accepted Open set U whose outer measure is less than A + epsilon
Nov
21
asked Open set U whose outer measure is less than A + epsilon
Nov
20
comment Show G has a normal subgroup of a given index
Nice and succinct answer
Nov
19
asked Delta-complex structure on S^2
Nov
19
revised Boundary Homomorphism Orientation (Very Basic Homology Question)
edited title
Nov
19
asked Boundary Homomorphism Orientation (Very Basic Homology Question)
Nov
19
comment Homology of hexagon
Oh yes.. I think I see what has gone wrong. Thanks
Nov
18
comment Analytic vs algebraic proof
Fundamental theorem of algebra has complex analysis proof (analytic) and Galois theory proof (algebraic).
Nov
18
comment Show $x^n+ax+b=0$ has most two solutions
Could $x$ be plus minus of the expression you found? Then there would be two stationary points.
Nov
18
comment Homology of hexagon
$\partial_1 d=\dots=\partial_1 i=w-v\neq 0$ so I thought that $d,\dots, i$ do not belong in $\ker \partial_1$. Since only $a,b,c$ belong to $\ker \partial_1$, I concluded that it has rank 3.
Nov
18
comment Homology of hexagon
Thanks! For part 2, I did try to use RREF to check whether the six vectors are linearly independent (they seem to be). Is there anything wrong with my delta complex?
Nov
18
accepted Homology of hexagon
Nov
17
comment Cauchy sequence in $L^p$, existence of a set with finite measure, and integral is less than epsilon over the complement
I just re-read your proof, and it is really amazing. How did you intuitively arrive at your proof? I can understand your proof, but don't know the idea behind how to approach such questions myself..
Nov
17
accepted Cauchy sequence in $L^p$, existence of a set with finite measure, and integral is less than epsilon over the complement
Nov
17
answered Equivalence of elements in a ring
Nov
17
asked Homology of hexagon
Nov
16
comment Free group with relations
Thanks, is it still true if we omit the commutator part, I.e [a,b]=...=1
Nov
16
comment Free group with relations
Thanks! Can you explain a bit on the collapsing part?