In regular algebra, addition and multiplication are commutative : $$A + B = B + A$$ $$A \times B = B \times A$$ they are also associative : $$A + (B + C) = (A + B) + C$$ $$A \times (B \times C) = (A\times B) \times C$$ And multiplication is said to be distributive : $$A \times (B + C) = (A \times B) + (A \times C)$$.
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Lancaster (/ËlÃ¦nkÃ¦stÉr/, local /ËlÃ¦Åkáµ»stÉr/); is a city located in South Central Pennsylvania which serves as the seat of Pennsylvania's Lancaster County and one of the oldest inland towns in the United States (along with Hartford, Connecticut; Springfield, Massachusetts; Petersburg, Virginia; Albany, New York; Schenectady, New York, and several ...