Luitzen Egbertus Jan Brouwer (27 February 1881 – 2 December 1966) was a Dutch mathematician who founded intuitionism and made important contributions to topology, such as his fixed-point theorem, which states that every continuous function *f* mapping a compact convex set into itself has a fixed point *a* [i.e. *f*(*a*) = *a*]. A consequence of the theorem is when a crumpled sheet of paper is placed on top of (and within the boundaries of) a copy of itself, at least one point on the top sheet lies over the corresponding point on the bottom sheet.

Brouwer had a huge impact on mathematics and logic in the Netherlands, influencing people such as Arend Heyting (student), Dirk van Dalen (grandstudent), and Henk Barendregt (great-grandstudent).

The Dutch Royal Mathematical Society (*Koninlijk Wiskundig Genootschap*) is organising a special event marking 50 years since Brouwer’s death. The event is on 9 December in the Amsterdam Science Park. It looks to be an interesting event. Details here.

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