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me3015.   engraving/Portrait/Austria   put into the basket

Eduard Helly.

1855. Heliogravure.
size: 20x14 cm.
page: 35x25 cm.
stained outside the picture.

price: 4.23 EURO

Eduard Helly (1884, Vienna – 1943, Chicago) was a mathematician and the eponym of Helly's theorem, Helly families, Helly's selection theorem, Helly metric, and the Helly-Bray theorem. In 1912, Helly published a proof of Hahn-Banach theorem, 15 years before Hahn and Banach discovered it independently.
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