closed certain operators many mathematical structures called '''algebras''' algebra field generally algebra ring br many classes algebras field ring specific name associative algebra non associative algebra lie algebra hopf algebra c algebra symmetric algebra exterior algebra tensor algebra measure theory sigma algebra algebra set category theory f algebra f coalgebra algebra logic relation algebra residuated boolean algebra expanded involution called converse boolean algebra complemented distributive lattice heyting algebra elementary algebra algebraic expression notation br nbsp power exponent br
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