Book Review: Computers and intractability: A guide to the theory of $NP$-completeness
Ronald V. Book · Bulletin of the American Mathematical Society · 1980
A Lie superalgebra, or (Z 2 -) graded Lie algebra, is a vector space © = © 0 © ©, with a bilinear multiplication, , satisfying the graded versions of the axioms for Lie algebras: if X G @ a , Y EL ® fi9 and Z G © y (a, /?, y G {0, 1}), then (1) (X, Y) = (-l) a *[r, X] ("graded antisymmetry");