François Walther de Sluze

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René François Walther de Sluze (Slusius), canon of Liège, (July 7, 1622 - March 19, 1685) was a mathematician. He found for the subtangent of a curve

f(x, y) = 0

an expression equivalent to

{-y {\partial f \over \partial x} \over {\partial f \over \partial x}}.

He also wrote numerous tracts, and in particular discussed at some length spirals and points of inflexion.

An original entry was based on the Rouse History of Mathematics
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