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285G, Lecture 5: Finite time extinction of the third homotopy group, I
In the previous lecture, we saw that Ricci flow with surgery ensures that the second homotopy group became extinct in finite time (assuming, as stated in the above erratum, that there is no embedded w… more →
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The augmentation ideal of a group ring
wrote 1 year ago: Lemma. Let be a commutative ring and let be a group. We define the map by Then is an onto ring homom … more →
285G, Lecture 5: Finite time extinction of the third homotopy group, I
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wrote 5 years ago: In the previous lecture, we saw that Ricci flow with surgery ensures that the second homotopy group … more →
