# Witches Kitchen 1971


http://t.co/sHn7nJ4uFj a #funny image about #mathematics by Alexander Grothendieck

![](https://cdn.hashnode.com/res/hashnode/image/upload/v1743071143076/d1e05967-1234-441f-98a4-b63e1d487b88.png)

> Riemann-Roch Theorem: The final cry: The diagram is commutative! To give an approximate sense to the statement about f: X → 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!

**Alexander Grothendieck** about the [Grothendieck–Riemann–Roch theorem](http://en.wikipedia.org/wiki/Grothendieck%E2%80%93Riemann%E2%80%93Roch_theorem) via [Math 245](http://math.stanford.edu/~vakil/11-245/)

* * *

Read also: [how does one understand GRR?](http://mathoverflow.net/questions/63095/how-does-one-understand-grr-grothendieck-riemann-roch)