`BookProof.QuantumGravityFock.qgGrade_involutive` (z : QGGraded) : qgGrade (qgGrade z) = z

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`BookProof.QuantumGravityFock.qgGrade_involutive` (z : QGGraded) : qgGrade (qgGrade z) = z · Prove2Me