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1. Let A, B, C be subsets of a universe U. i. If A is contained...

1. Let A, B, C be subsets of a universe U.

i. If A is contained in B, then C \ A is contained in C \ B.

ii. If A and B are disjoint, then A \ C and B \ C are disjoint.

iii. If A and B are disjoint, then A ∪ C and B ∪ C are disjoint.

iv. If A ⊆ (B ∪ C), then A ⊆ B or A ⊆ C.

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