Definitions DiscreteMath Sections DiscrMathExt Doc
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Counting indirectly - basic forms: dependent pairs (2). Counting(dependent pairs - 1)

Thm*  a:b:(a). (i:ab(i)) ~ ( i:ab(i))

This priniciple very nearly tells us that if we assign to each MEMBER of a finite class, another finite class, then we can count the pairs of the dependent-pair-type by simply adding up the sizes of all the classes in the family of classes.

(to be continued later - sfa)

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Definitions DiscreteMath Sections DiscrMathExt Doc