X Y {a, b, c } { b, c, d } {b, c, e } { a, b, d, f } {b, c, e } empty set {b, c, e } { a, f, h }
A A A A A \ A
Calculate
A B A B A \ B ~ ( ~A ) ~ ( A B ) ~ ( A B ) ~ ( A \ B )
a) A \ B, B \ A b) C \ A, C \ B
Last modified: 27/July/98 (12:14)