bio  website  math.berkeley.edu/~ianagol 

location  Berkeley  
age  45  
visits  member for  5 years, 9 months 
seen  1 hour ago  
stats  profile views  12,590 
I'm a professor at UC Berkeley working predominantly in the field of lowdimensional topology.
3h

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Surgery along an arc connecting the components of a $2$component link gives the unknot
I think this observation underlies the other papers I linked to. 
3h

comment 
Surgery along an arc connecting the components of a $2$component link gives the unknot
Hey Jim  the paper has nothing to do with Schoenfies  it's about 2spheres embedded in $\mathbb{R}^4$ with 4 critical points. Saying such a sphere is standard is equivalent to saying that any band sum of the 2component unlink which gives the unknot is standard. Scharlemann proves this actually for split links. A simpler proof was found later by Thompson. dx.doi.org/10.1016/00409383(87)900607 
17h

revised 
Surgery along an arc connecting the components of a $2$component link gives the unknot
added 368 characters in body 
17h

answered  Surgery along an arc connecting the components of a $2$component link gives the unknot 
2d

awarded  Nice Answer 
2d

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Is every nonabelian finite simple group a quotient of a triangle group $(a,b,c)$ with $a,b,c$ coprime?
I believe most finite simple groups are generated by elements of order 2 and 3, which addresses the 2nd part of your question. mathoverflow.net/a/59300/1345 
2d

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Intuition behind the Morse inequalities?
added 5 characters in body 
Jul 27 
answered  Intuition behind the Morse inequalities? 
Jul 21 
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Torsion in profinite groups
By intersect trivial, you mean intersect in the identity element? I don't see why this follows from pointset topology. 
Jul 21 
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Torsion in profinite groups
Maybe you can expand the argument in your fourth sentence  I don't understand why one has only finitely many conjugates to intersect in the identity. 
Jul 15 
awarded  Enlightened 
Jul 15 
awarded  Nice Answer 
Jul 15 
comment 
the space of continuous maps between 3manifolds
This was explained here: mathoverflow.net/a/19562/1345 
Jul 9 
answered  Your favorite papers on geometric group theory 
Jul 2 
awarded  Nice Answer 
Jul 1 
comment 
PSL(2,p) as quotient of triangle groups
@ Will Sawin: maybe you could add more details of your "general nonsense" answer  this could be useful to people. 
Jun 30 
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PSL(2,p) as quotient of triangle groups
Ok, well presumably you mean a scheme, in which case it's due to youknowwho. 
Jun 30 
comment 
PSL(2,p) as quotient of triangle groups
@ Will Sawin: Which "general nonsense" do you have in mind? Some model theory? And who originally made such arguments? 
Jun 30 
answered  PSL(2,p) as quotient of triangle groups 
Jun 23 
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Next steps on formal proof of classification of finite simple groups
How about a formalized proof of the existence of the Monster ;) 