Singular poles

By a lucky coincidence, we went today on an outing for lunch at the restaurant of the “Schloss Raperswil”, about half an hour from Zürich. On the way to the castle, I noticed a poster for the current exhibition at the Polish Museum there, and here is the interesting part of it:


I’m quite happy, in particular, to see here my mathematical great-grand-father…

I didn’t have time to go see the exhibition itself today, but I hope to go back soon to check its actual contents. In particular, I’d like to know the date this drawing was made, and why Denjoy and Choquet, both French mathematicians, are included.

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I am a professor of mathematics at ETH Zürich since 2008.

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