I think, therefore I am.

- René Descartes, Discourse on the Method of Rightly Conducting the Reason in the Search for Truth in the Sciences.

I have a truly marvelous proof of this proposition which this margin is too narrow to contain.

- Pierre de Fermat, note in the margin of his copy of Claude-Gaspar Bachet's translation of the Arithmetica of Diophantus.

In the year AD 1637...

These people were born in 1637...

These people died in 1637...

1636 - 1637 - 1638

17th century

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