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seen Dec 12 '12 at 17:45

Dec
12
awarded  Organizer
Dec
12
revised Infinitely sheeted covering spaces!
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Dec
12
suggested suggested edit on Infinitely sheeted covering spaces!
Nov
29
comment Compact surfaces and Fundamental Groups
@JasonDeVito I am tempted to say that the Euler characteristic of the surface has to be zero, but I don't have a very strong argument??
Nov
29
comment Compact surfaces and Fundamental Groups
@JasonDeVito: By $M\cong N$ do you mean their fundamental groups?
Nov
29
comment Compact surfaces and Fundamental Groups
@JasonDeVito I think it multiplies, but i am not sure exactly how? Can you elaborate?
Nov
29
comment Compact surfaces and Fundamental Groups
Projectiv space $RP(2)$ would be another example I think?
Nov
29
awarded  Commentator
Nov
29
comment Compact surfaces and Fundamental Groups
@JasonDeVito How would the Euler Characteristic help me in this case?
Nov
29
revised Compact surfaces and Fundamental Groups
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Nov
29
comment Compact surfaces and Fundamental Groups
@ Neal: Yea sorry, I should have been more careful! I am not looking just for an answer at all, I want to know how to get to the answer. But I am having trouble figuring out how to tackle this question, so any hints would be appreciated?
Nov
29
asked Compact surfaces and Fundamental Groups
Nov
28
comment Showing that $\lim_{x\rightarrow 0} \frac{1}{x}\int_0^x |\sin(1/y)| \mathrm{d} y \not=0$
Wouldn't the limit be exactly $\frac{2}{\pi}$?
Oct
27
comment convergent series, sequences?
Thanks! Both nice solutions!
Oct
27
comment convergent series, sequences?
Great, it worked out! Tanks!
Oct
27
asked convergent series, sequences?
Oct
26
comment Fundamental Group!
Ok, so given that the adjunction space represents the connected sum of 4 tori, then the presentation group would be: $\langle \alpha_1, \beta_1,\dots, \alpha_4, \beta_4 : \alpha_1\beta_1\alpha_1^{-1}\beta_1^{-1},\dots, \alpha_4\beta_4\alpha_4^{-1}\beta_4^{-1} \rangle$ right? If this is correct, then I just need to have a better argument as to why that adjunction space is the connected sum of 4 tori??
Oct
26
comment Fundamental Group!
I guess, my first problem is to see how exactly this adjunction space is giving us a genus 4 surface...I mean, I can see it intuitively it makes sense, but how to show it more rigorously?
Oct
26
awarded  Editor
Oct
26
revised Fundamental Group!
deleted 143 characters in body