In accordance with the promise I made at the end of this post today I FedExed the first T-shirt to the author of this comment pointing out a mistake in the formulation of a lemma. There are still 1 large and 3 medium T-shirts left…

September 25, 2012: Two more errors found. For the first, see this comment. For the second see this change.

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  1. Pingback: Making math beautiful with XyJax « mathbabe

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