Mathematicians born on this day:
1783 : ClaudeLouis Mathieu 
Mathematicians who died on this day:
1694 : Ismael Boulliau 
Édouard Goursat  Ismael Boulliau  Ernst Schröder 
Ismael Boulliau (1605  1694)
As for the power by which the Sun seizes or holds the planets, and which, being corporeal, functions in the manner of hands, it is emitted in straight lines throughout the whole extent of the world, and like the species of the Sun, it turns with the body of the Sun; now, seeing that it is corporeal, it becomes weaker and attenuated at a greater distance or interval, and the ratio of its decrease in strength is the same as in the case of light, namely, the duplicate proportion, but inversely, of the distances that is, ^{1}/_{d2}.
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School of Mathematics and Statistics University of St Andrews, Scotland  