Let a be the common cardinality of sets A and C. Let b be the size of B. If C is a subset of B, then a<= b.

I understand why this is true, but how do I give a solid proof?

Thanks.

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- Feb 26th 2009, 09:18 PMjzelltProof: cardinalities of sets
Let a be the common cardinality of sets A and C. Let b be the size of B. If C is a subset of B, then a<= b.

I understand why this is true, but how do I give a solid proof?

Thanks. - Feb 26th 2009, 09:23 PMJhevon