Simon Stevens is often credited with inventing decimals. He shared his theory of decimals and integers.
It isn't really accurate to say he invented decimals though. Decimals were in use prior to Stevens. He really popularized their use by presenting them in a straightforward, easy to comprehend way and showing their usefulness and applicability to engineering problems.
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The twelve apostles were simon james john andrew philip thomas bartholomew mathew james simon thadaeus- james Judas iscariot srry bout the capitals
His lifespan was 72 years: from 1548 to 1620.
Yes. The derivation is a bit hard to do on here, but it can be found in Physical Chemistry: A Molecular Approach by McQuarrie and Simon.
He formulated Laplace's equation, and pioneered the Laplace transform which appears in many branches of mathematical physics, a field that he took a leading role in forming. The Laplacian differential operator, widely used in mathematics, is also named after him. He restated and developed the nebular hypothesis of the origin of the solar system and was one of the first scientists to postulate the existence of black holes and the notion of gravitational collapse. And much more...