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Why has the well-known
Coleman-Mandula theorem (note hyphen typical of compound adjectives) been suddenly re-christened the "Coleman Mandula" theorem? The en-dash is typically used to show intervals but appears in compound words only when one of them already has a hyphen in it. This change seems to
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is quite wrong. Each direct product of groups is again a group. I suspect that it was intended to say "the direct product of the Lie algebras of the
Poincaré group and of an internal group". (Note that the definition of the direct product of two Lie algebras is not too obvious - if one likes to get
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I have a modest background in particle physics, but even to me the article is dense. I doubt a layman could comprehend a single sentence. This article will have to be completely rewritten; I just wish I knew enough about this to do so.
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MoS policy stipulates that the en dash is used whenever there are two different names, such as
Coleman and Mandula, while the usual dash - is used if it is a single person, such as Levi-Civita.
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In that way, this internal group must be supposed to be a Lie group, at least to be something like a continuous group. That is, discrete internal symmetries like parity are not concerned.
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a symmetry Lie algebra which is always a direct product of the
Poincaré group and an internal group
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The internal Lie algebra is a direct sum of semisimple compact algebras and
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algebras. I think these algebras are also called compact and
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