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2d
comment Classical presentation of fundamental group of surface with boundary
You are absolutely right. Hope the edit helps.
2d
revised Classical presentation of fundamental group of surface with boundary
actually answering the question
Aug
26
comment In $n>5$, topology = algebra
This is quite beautifully explained in the first chapter of Scorpan's nice The Wild World of 4-Manifolds. I recommend it strongly.
Aug
26
reviewed Approve suggested edit on Simplify the expression $(2x^2 - 2)/(x+1)$ to 2x + 2
Aug
26
answered Classical presentation of fundamental group of surface with boundary
Aug
20
comment why the numbers of poles and zeros of meromorphic function on the riemann sphere is finite?
Basically, the Rieman sphere is compact so every infinite sequence of zeroes or poles has an accumulation point. It is then a consequence of the Isolated Zeroes Theorem (there are some details to be ironed out, that's why I don't write this as an answer).
Aug
20
awarded  Custodian
Aug
20
reviewed Approve suggested edit on Test the convergence of a series
Jul
3
comment Factor $n=59305397$ given that $ p-q \le 10 $
59305397 = 7699 × 7703 :-)
Jul
2
awarded  Curious
Jun
16
awarded  Nice Question
Feb
26
awarded  Pundit
Feb
14
awarded  Yearling
Nov
19
revised Is the quotient map a homotopy equivalence?
added 116 characters in body
Nov
19
comment Is the quotient map a homotopy equivalence?
Oh, drat. You're right, of course. I wanted to avoid technicalities, but I can't. I will modify the question. Thank you very much.
Nov
18
awarded  Promoter
Nov
15
comment connected sum of torus with projective plane
No worries. I was genuinely curious.
Nov
15
comment connected sum of torus with projective plane
Nice. Where do these pictures come from?
Nov
15
comment Is the quotient map a homotopy equivalence?
Yes: for me, contractibility implies connectedness.
Nov
15
asked Is the quotient map a homotopy equivalence?