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I'm interested in the great amount of mathematics involved in the study of lowdimensional manifolds, above all the interaction between topology, geometry and algebra (and physics?).
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awarded  Disciplined 
Nov 10 
awarded  Yearling 
Sep 24 
awarded  Autobiographer 
Jan 7 
awarded  Nice Question 
Dec 24 
awarded  Critic 
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awarded  Supporter 
Oct 12 
accepted  Why is the mapping class group of hyperbolic manifolds finite? 
May 30 
asked  Why is the mapping class group of hyperbolic manifolds finite? 
Apr 25 
comment 
Heegaard splitting, equivalent homeomorphisms, mapping class group of genus ntorus
wow, this is what I was looking for! Thank you sooooo much!! 
Apr 23 
comment 
Heegaard splitting, equivalent homeomorphisms, mapping class group of genus ntorus
[continued] What can we say about the two resulting manifolds? Even if we take f and g in the same double coset, they do not in general extend to automorphisms of the manifolds, so we don't get an isomorphism between them. Moreover, if they give the same manifold, do they give equivalent splittings? This is the kind of questions I'm thinking about. 
Apr 23 
comment 
Heegaard splitting, equivalent homeomorphisms, mapping class group of genus ntorus
I didn't find anything at that page...anyway I already knew that book, so I think you are referring to the article of Birman (maybe we have different page numberings). The point is I'm not satisfied with this :) I mean: by Birman, we know that if a manifold admits two equivalent splittings, than they are obtain from gluing maps which are in the same double coset. But what about the converse? Suppose we are given two genus g handlebodies and we want to glue them along their boundaries to obtain a 3manifold, and we use two different maps, say $f$ and $g$. 
Apr 20 
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Heegaard splitting, equivalent homeomorphisms, mapping class group of genus ntorus
Hi Maxime, can you please give me a reference for the first part of your answer ("You obtain the same Heegaard splitting iff your homeomorphisms are in the same double coset H\M/H where H is the subgroup of mapping classes that extend to the handlebody.") Moreover, I can't catch which is the relation between saying that two splitting give the same manifold (up to homeomorphism) and saying that two splitting are equivalent splittings for the same manifold. Someone can help? thanks in advance 
Mar 24 
awarded  Scholar 
Mar 24 
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Why is Casson's invariant worth studying?
ok thank you, and sorry..it's my first question on MathOverflow 
Mar 24 
accepted  Why is Casson's invariant worth studying? 
Mar 22 
comment 
Why is Casson's invariant worth studying?
Wow thank you so much..you give me lots of things to think about! thank you again for your answer! 
Mar 17 
awarded  Student 
Mar 17 
asked  Why is Casson's invariant worth studying? 