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``alternative notation'' by Wkbj79 on 2006-06-19 17:57:53
For the phrase, "H is a characteristic subgroup of G", the only notation I have ever seen in books and used by professors is "H char G". I have told many of my "mathematical friends" (and most of them agree with me), that "H \blacktriangleleft G" is a better notation. (Actually, I would prefer something more like \blacktrianglelefteq, but such does not seem to exist.) Any opinions on this?

Warren
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