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What is man in nature? Nothing in relation to the infinite, all in relation to nothing, a mean between nothing and everything.

Pensees. 1670.

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# Mathematical Treasures

## Kepler's Logarithms

This is the title page of Johannes Kepler’s (1571—1630) Chilias Logarithmoria, 1624, logarithmic tables he constructed by geometric procedures. Kepler also gave a proof of why logarithms worked and then used them extensively in his calculations of the Rudolphine astronomical tables.