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• CommentRowNumber1.
• CommentAuthorUrs
• CommentTimeSep 18th 2016
• (edited Sep 18th 2016)

I finally realized that this ought to exist. And sure enough, it had been constructed already: the 4d supergravity Lie 2-algebra-extension of the 4d $N = 2$ super-Poincaré super-Lie algebra. I have added a minimum of an Idea-section and pointers to the references.