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In mathematics and theoretical physics, a Gerstenhaber algebra (sometimes called an antibracket algebra or braid algebra) is an algebraic structure discovered by Murray Gerstenhaber (1963) that combines the structures of a supercommutative ring and a graded Lie superalgebra. It is used in the Batalin–Vilkovisky formalism. ==Definition== A Gerstenhaber algebra is a graded commutative algebra with a Lie bracket of degree -1 satisfying the Poisson identity. Everything is understood to satisfy the usual superalgebra sign conventions. More precisely, the algebra has two products, one written as ordinary multiplication and one written as (), and a Z-grading called degree (in theoretical physics sometimes called ghost number). The degree of an element ''a'' is denoted by |''a''|. These satisfy the identities *|''ab''| = |''a''| + |''b''| (The product has degree 0) *|()| = |''a''| + |''b''| - 1 (The Lie bracket has degree -1) *(''ab'')''c'' = ''a''(''bc'') (The product is associative) *''ab'' = (−1)|''a''||''b''|''ba'' (The product is (super) commutative) *() = ()''c'' + (−1)(|''a''|-1)|''b''|''b''() (Poisson identity) *() = −(−1)(|''a''|-1)(|''b''|-1) () (Antisymmetry of Lie bracket) *]+(-1)^] = 0.\, 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Gerstenhaber algebra」の詳細全文を読む スポンサード リンク
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