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- ...The notion of binary operation is meaningless without the set on which the operation is defined. For two elements ''a'' and ''b'' in a set ''S'', ''a'' ∗ ''b' ...nd one are abstracted to give the notion of an ''identity element'' for an operation. Zero is the identity element for addition and one is the identity element13 كيلوبايت (814 كلمة) - 21:15، 12 نوفمبر 2010
- * clean-up operation * commutative operator35 كيلوبايت (3٬255 كلمة) - 16:41، 12 يوليو 2011