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308 pages, Kindle Edition
First published October 4, 2011
'Mathematics has four operations: addition, subtraction, multiplication, and division - marriage is not one of them.'Levi-Strauss was disappointed by Hadamard's response, but he didn't give up. Some days later he found Weil, Hadamard's former student. Weil studied the Murngin marriage rules the anthropologist showed him, and he found that, indeed, the problem was deeply mathematical and very complicated. (According to Murngin marriage laws, a man must marry one kind of cousin, if she exists, but is absolutely forbidden to marry a woman who happens to be another kind of cousin. Similar rules hold for women. This leads to the existence of sets of people within the tribe who, in turn, are either must-marry or taboo.) Weil was intrigued, and he ended up solving the problem (of determining the long-term structure of a society that follows these intricate marriage laws) using the abstract mathematics of group theory. It was an applied piece of work he remained very proud of throughout his life, even though he was otherwise a pure mathematician." (p. 243-244)