Wednesday, March 22, 2017

Warning! — Theorems ahead

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Don't worry, no danger ahead! — This is just a short post about the German mathematician Ewald Warning and the theorems that bear his na...
Sunday, February 5, 2017

Counting points and counting curves on varieties — Tribute to Daniel Perrin

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$\require{enclose}\def\VarC{\mathrm{Var}_{\mathbf C}}\def\KVarC{K_0\VarC}$ Daniel Perrin is a French algebraic geometer who turned 70 last...
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Monday, January 9, 2017

“May you and all your students flourish.”

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Francis Su was the former president of the Mathematical Association of America. He just gave a beautiful address at the AMS-MAA Joint Mee...
Saturday, June 11, 2016

Triviality of vector bundles with connections on simply connected varieties

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I would like to discuss today a beautiful theorem of Grothendieck concerning differential equations. It was mentioned by Yves André in a won...
Thursday, May 5, 2016

Bourbaki and Felix Klein

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A colleague just sent me Xerox copies of a few pages of a 1899 biography of the général Bourbaki . Its author, François Bournand, was the pr...
Friday, April 29, 2016

Roth's theorems

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A few days ago,  The Scotsman published a paper about Klaus Roth's legacy, explaining how he donated his fortune (1 million pounds) to ...
Wednesday, April 13, 2016

Weierstrass's approximation theorem

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I had to mentor an Agrégation leçon entitled Examples of dense subsets. For my own edification (and that of the masses), I want to try to r...
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