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Conway group
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==History== {{harvs|txt|first=Thomas |last=Thompson|year=1983}} relates how, in about 1964, [[John Leech (mathematician)|John Leech]] investigated close packings of spheres in Euclidean spaces of large dimension. One of Leech's discoveries was a lattice packing in 24-space, based on what came to be called the Leech lattice Ξ. He wondered whether his lattice's symmetry group contained an interesting simple group, but felt he needed the help of someone better acquainted with group theory. He had to do much asking around because the mathematicians were pre-occupied with agendas of their own. [[John Horton Conway|John Conway]] agreed to look at the problem. [[John G. Thompson]] said he would be interested if he were given the order of the group. Conway expected to spend months or years on the problem, but found results in just a few sessions. {{harvtxt|Witt|1998|loc= page 329}} stated that he found the Leech lattice in 1940 and hinted that he calculated the order of its automorphism group Co<sub>0</sub>.
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