Re: [math-fun] Asimov's group-metric puzzle

17 Sep 2015

      Message: 2
Date: Thu, 17 Sep 2015 12:03:46 -0700
From: Marc LeBrun <mlb@well.com>
To: math-fun <math-fun@mailman.xmission.com>
Subject: Re: [math-fun] Asimov's group-metric puzzle
Message-ID: <D2205CA2.1C037%mlb@well.com>
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[sorry for the previous spam]
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="Warren D Smith" <warren.wds@gmail.com>
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Here is a list of the sporadic simple groups without Outer auts:
M11, M23, M24, Co1, Co2, Co3, Th, Fi23, B, M, J1, Ru, J3, Ly
(source: http://brauer.maths.qmul.ac.uk/Atlas/v3/spor/)
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Here is a list of the sporadic simple groups with outer auts:
M12, M22, HS, J2, McL, Suz, He, HN, Fi22, Fi24', O'N, J3, T
LeBrun: J3 appears in both lists, but J4 in neither?

WDS: sorry. J3 has an outer aut, J4 does not.