bio | website | dm.unipi.it/~martelli |
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location | Pisa (Italy) | |
age | 41 | |
visits | member for | 3 years, 11 months |
seen | 3 hours ago | |
stats | profile views | 3,297 |
Assistant professor (ricercatore) at Math Dept (University of Pisa)
Apr 11 |
comment |
On trivalent spines of surfaces
isn't it the other way round? I would think that without labelled points the situation is easier: spines are dual to ideal triangulations of the surface and Hatcher's argument applies. But maybe I am confused by these points. |
Apr 8 |
answered | On trivalent spines of surfaces |
Feb 28 |
revised |
Does a small-area sphere in a 3-manifold bound a small ball?
added 13 characters in body |
Feb 28 |
comment |
Does a small-area sphere in a 3-manifold bound a small ball?
thanks! The adaptation of Alexander's proof does not seem totally obvious to me: you should use that R^3 has a metric which is periodic over a group acting co-complactly, otherwise the theorem is clearly false (since R^3 is not compact). |
Feb 28 |
awarded | Nice Question |
Feb 27 |
comment |
Does a small-area sphere in a 3-manifold bound a small ball?
AFAIK, the isoperimetric inequality tells you that a null-homotopic small sphere bounds a small region, but that small region might not be a ball: the ball could be on the other side. This confuses me a bit. |
Feb 27 |
revised |
Does a small-area sphere in a 3-manifold bound a small ball?
added 345 characters in body |
Feb 27 |
asked | Does a small-area sphere in a 3-manifold bound a small ball? |
Feb 22 |
reviewed | Approve suggested edit on If Gaussian measures on a Hilbert space converge weakly to 0, how do their covariance operators converge? |
Feb 20 |
awarded | Nice Question |
Feb 20 |
revised |
Fox re-imbedding theorem in dimension four
+ tag |
Feb 19 |
revised |
Fox re-imbedding theorem in dimension four
added 22 characters in body |
Feb 19 |
asked | Fox re-imbedding theorem in dimension four |
Feb 13 |
awarded | Good Question |
Jan 26 |
awarded | Enlightened |
Jan 26 |
awarded | Nice Answer |
Jan 12 |
revised |
The history of the geometrization of closed surfaces
typos |
Jan 10 |
reviewed | Approve suggested edit on Is there a similar theorem in the partially hyperbolic case? |
Jan 8 |
reviewed | Approve suggested edit on Derivations of algebra of smooth $g$-valued function? |
Jan 6 |
awarded | Popular Question |