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Vertices + Faces - Edges = 2

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Foundations of Differential Calculus

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He authored over 800 papers and books in math/physical sciences

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Stayed religious througout life

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Enrolled in college at age 13

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Great memory

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Good at mental math from a young age

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Grew up in Riehen

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Father a Calvanist pastor

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Pastor's grandson (mother's side)

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Used to solve ordinary differential equations (equations related to their derivatives (slope of a curve))

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Euler's Formula

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Highly prolific (productive) author

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Also worked on astronomy/lunar motion, acoustics, mechanics and music

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Euler's Identity

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Popularized π and f(x)

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Lost vision in right eye probably due to cartography

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Published Mechanica in 1736 (math of motion)

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Married Katharina Gsell in 1734 (K.G. died in 1773)

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Professor of physics at St. Petersburg Academy --> math division

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Served in Navy

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1727 --> Russia

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Educated Euler

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Contributed to infinitesimal calculus

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Tutored by Johann Bernoulli in secret

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Planned to be a rural clergyman (religious leader)

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Died on September 18, 1783 in St. Petersburg, Russia by brain hemorrhage

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https://www.biography.com/people/leonhard-euler-21342391
and
https://www.famousscientists.org/leonhard-euler/

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Also a physical scientist

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Contributed to geometry, trigonometry, calculus, differential equations, number theory and notational systems

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Born April 15, 1707 in Basel, Switzerland