Daniel Hay du Chastelet de Chambon
Encyclopedia
Daniel Hay du Chastelet (23 October 1596, Laval
Laval, Mayenne
Laval is a commune in the Mayenne department in north-western France.It lies on the threshold of Brittany and on the border between Normandy and Anjou. Its citizens are called Lavallois.-Geography:...

 – 20 April 1671) was a French
French people
The French are a nation that share a common French culture and speak the French language as a mother tongue. Historically, the French population are descended from peoples of Celtic, Latin and Germanic origin, and are today a mixture of several ethnic groups...

clergyman and mathematician
Mathematician
A mathematician is a person whose primary area of study is the field of mathematics. Mathematicians are concerned with quantity, structure, space, and change....

. His brother Paul Hay du Chastelet
Paul Hay du Chastelet
Paul Hay du Chastelet was a French magistrate, orator and writer. His brother Daniel Hay du Chastelet de Chambon was a mathematician.-External links:*...

 was also a writer.
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