Grandes questões da vida

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Um comentário a “Grandes questões da vida”

1. 

   carnide

   Dezembro 20, 2007

   Cartesian product is associative, e.g., {1, 2} × ({a, b} × {X, Y}) = ({1, 2} × {a, b}) × {X, Y}, but is not commutative, e.g., {1, 2} × {a, b} ≠ {a, …
   http://www.nist.gov/dads/HTML/associative.html –

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   Definition: For sets, A,B ⊆ U, the Cartesian product or cross product, of A and … Cross product is not associative, i.e., (A …
   poseidon.cse.pusan.ac.kr/~dhlee/course/s06/DM/data/lect05-relation.pdf –