`BookProof.ChapterA3.massless_little_group` : {T : Matrix (Fin 2) (Fin 2) ℂ | T.det = 1 ∧ FixesNullAxis (Upsilon T)} = SEtwo

Initializing...

`BookProof.ChapterA3.massless_little_group` : {T : Matrix (Fin 2) (Fin 2) ℂ | T.det = 1 ∧ FixesNullAxis (Upsilon T)} = SEtwo · Prove2Me