1640 in science

none 1640 science 1640 The year 1640 in science and technology involved some significant events. Botany John Parkinson publishes Theatrum Botanicum:The Theater of Plants, or, An Herbal of a Large Extent.Linh Tran Theatrum Botanicum: The Theater of Plants, or, An Herbal of a Large Extent http://www.csdl.tamu.edu/FLORA/cushing/Parkin1.htm Texas A&M University Bioinformatics Working Group 2011-04-01 https://web.archive.org/web/20081105001300/http://www.csdl.tamu.edu/FLORA/cushing/Parkin1.htm November 5, 2008 Mathematics The 16-year-old Blaise Pascal demonstrates the properties of the hexagrammum mysticum in his Essai pour les coniques which he sends to Mersenne. October 18 – Fermat states his "little theorem" in a letter to Frénicle de Bessy: if p is a prime number, then for any integer a, a p − a will be divisible by p. December 25 – Fermat claims a proof of the theorem on sums of two squares in a letter to Mersenne ("Fermat's Christmas Theorem"): an odd prime p is expressible as the sum of two squares. Technology The micrometer is developed. A form of bayonet is invented; in later years it will gradually replace the pike. The reticle telescope is developed and initiates the birth of sharpshooting. Births April 1 – Georg Mohr, Danish mathematician (died 1697) December 13 (bapt.) – Robert Plot, English naturalist and chemist and illustrator of the first dinosaur fossil (died 1696) Elias Tillandz, Swedish physician and botanist in Finland (died 1693) Deaths December 22 – Jean de Beaugrand, French mathematician (born c. 1584) References Category:17th century in science Category:1640s in science