Bachelier

Louis Jean-Baptiste Alphonse Bachelier (March 11, 1870 - April 28, 1946) was a French mathematician at the turn of the 20th century. He is credited with being the first person to model Brownian motion, which was part of his PhD thesis The Theory of Speculation, (published 1900).His thesis, which discussed the use of Brownian motion to evaluate stock options, is historically the first paper to use advanced mathematics in the study of finance. Thus, Bachelier is considered a pioneer in the study of financial mathematics and stochastic processes.
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n. bachelor, graduate who holds a bachelor's degree

Bachelor knight . Before a knight settled and attracted followers, they held the rank of bachelier. They might then go out at war or tourney or just adventuring, similar to the errant knight of romantic history. See also knight banneret .