## High time to change our course!

### January 29, 2008

Witch’s Kitchen 1971. Riemann-Roch Theorem: The ‘dernier cri’: The diagram is commutative! To give an approximate sense to the statement about $f : X \rightarrow Y$, I had to abuse the listeners’ patience for almost two hours. Black on white (in Springer Lecture Notes) it probably takes about 400, 500 pages. A gripping example of how our thirst for knowledge and discovery indulges itself more and more in a logical delirium far removed from life, while life itself is going to Hell in a thousand ways—and is under the threat of final extermination. High time to change our course!

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Grothendieck wrote this abstract into the colloquium book at the Universität Bielefeld when he spoke there in 1971, from “Comme Appelé du Néant — As If Summoned from the Void: The Life of Alexandre Grothendieck” by Allyn Jackson [1] [2].