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Happy birthday Leibniz.

Our science is much interested in understanding how things change, and the derivative & the integral sit at the heart of how mathematicians and scientists understand change. Let me introduce you today to a German man who invented calculus and developed the present day notation for the differential & integral calculus. His contributions to the development of calculus have also had a major impact on physics.

It's the birthday of , the last universal genius - - -

Through meeting with such scholars as in Paris and with members of the Royal Society, including , during two trips to London in 1673 and 1676, Leibniz was introduced to the outstanding problems challenging the mathematicians and physicists of Europe.

He has been called the "last universal genius" due to his vast expertise across fields, which became a rarity after his lifetime with the coming of the Industrial Revolution and the spread of specialized labour.

As a mathematician, his greatest achievement was the development of the main ideas of differential & integral calculus, independently of 's contemporaneous developments. Mathematical works have consistently favored Leibniz's notation as the conventional expression of calculus.

In physics, Leibniz contributed a fair amount to the statics & dynamics emerging around him, often disagreeing with & Newton. He devised a new theory of motion based on kinetic & potential energy, which posited space as relative, whereas Newton was thoroughly convinced that space was absolute. He held a relationist notion of space & time, against Newton's substantivalist views. The rise of general relativity & subsequent work in the history of physics has put Leibniz's stance in a more favorable light.

He was the first to describe a pinwheel calculator in 1685 & invented the Leibniz wheel. He also refined the binary number system, which is the foundation of nearly all digital (electronic, solid-state, discrete logic) computers.

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