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• CommentRowNumber1.
• CommentAuthorUrs
• CommentTimeMay 11th 2022

a stub, in order to make links work (this needed now at symmetry protected topological phase etc., but it has also long been requested at Coleman-Mandula theorem)

• CommentRowNumber2.
• CommentAuthorUrs
• CommentTimeMay 15th 2022

added one reference that makes the definition of internal symmetry in CMT fully explicit

• Charles Zhaoxi Xiong, p. 13 of: Classification and Construction of Topological Phases of Quantum Matter $[$arXiv:1906.02892$]$

(will try to find a more canonical reference for this).

Also added a warning that the historical terminology at some point was the opposite to what it is today:

Beware that old historical articles (eg. Barlow 1883) used “internal symmetry” to refer to crystallographic symmetry which now is referred to as “spatial symmetry” and regarded as non-internal.

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