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Jacques & Jean Bernoulli, mathematicians

Jacques & Jean Bernoulli, mathematicians

H402/0260

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SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY

Caption

Bernoulli brothers. Engraving of Jean (Johann) and Jacques (Jacob) Bernoulli, Swiss mathematicians. Jean (1667-1748), sitting, wrote on differential equations & curves. Jacques (1654- 1705) studied infinite series, curves and differential calculus; he invented the term 'integral'. The brothers often quarrelled and are seen debating a mathematical problem in 1696. The brachistochrone problem was the derivation of the curve along which a particle will most quickly move from one point to another which is not directly below it. Jacques devised a correct proof leading to a cycloid curve. Using Jacques' idea, Jean used a cycloid curve but substituted an incorrect proof.

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