Posted by
**sara** on
.

If A is a finite set and B is a proper subset of A, prove that |B| < |A|.

Hint: B is finite. What is the union of the disjoint sets B and A - B?

Note: |A| = size of A

Wednesday

March 29, 2017
Posted by
**sara** on
.

If A is a finite set and B is a proper subset of A, prove that |B| < |A|.

Hint: B is finite. What is the union of the disjoint sets B and A - B?

Note: |A| = size of A

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