Centuries: 2nd century - 3rd century - 4th century
Decades: 190s 200s 210s 220s 230s - 240s - 250s 260s 270s 280s 290s
Years: 235 236 237 238 239 - 240 - 241 242 243 244 245
... He published his proof in the book Euclides Danicus, Amsterdam, 1672.
Although the book was included in bibliographies of mathematics, nobody troubled to examine it, ...
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