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Pieter Cosyn was a Dutch painter who specialized in landscape painting.
Marin Mersenne (also Marinus Mersennus or le Père Mersenne) was a French mathematician, physicist, philosopher and theologian, and music theorist.
Mersenne was educated at the Jesuit college of La Fleche and went on to study theology in Paris. He also became a member of the Order of the Minims and taught philosophy and theology at Nevers. He developed his ideas about the essence of the world and knowledge, insisting on the importance of experimentation and observation, and contrasted the rational natural world with human reason.
Beginning in 1635, Mersenne founded the Académie Parisienne, the forerunner of the French Academy of Sciences, where France's leading mathematicians and natural philosophers gathered. It provided a forum for the exchange of ideas among scientists and promoted the works of René Descartes and Galileo. The scientist's most famous achievement in mathematics was finding a formula for generating prime numbers, known today as Mersenne's Numbers. In 1644, Mersenne published his studies of Mersenne numbers and their relationship to prime numbers. His work in number theory and arithmetic proved pivotal to the development of mathematics in the seventeenth century.
He corresponded with many other scientists of the era, such as René Descartes, Blaise Pascal, and Pierre Fermat. However, his contributions extend much further, through his role in disseminating the work of the outstanding minds of his time. Mersenne traveled extensively throughout Europe, bringing new scientific ideas to France. He was an important mediator in the exchange of knowledge and contributed to the advancement of science in his era.
