Encyclopedia > John Playfair

Article Content

John Playfair

John Playfair, 1748-1819, was a Scottish scientist. He helped Sir Charles Lyell in many experiments and researches and had many contributions to James Hutton.

In 1795 Playfair created an alternative formulation of Euclid's parallel postulate called Playfair's axiom.

All Wikipedia text is available under the terms of the GNU Free Documentation License

Search Encyclopedia

Search over one million articles, find something about almost anything!

Featured Article

Quadratic formula

... in a single point.) If the discriminant is positive, then there are two different solutions x, both of which are real. (Geometrically, this means that the parabola ...