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1. Principles and first applications
1.1 Founding principles of Combinatorics
We usually note │A│ for the number of elements, or effective, or cardinal of a finite part A of a reference set E. Other notations are in use, such as # (A) or Card (A).
Recall that, for two parts A and B of E, the notation
, the union of A and B, designates the set of x such that x ∊ Aoux ∊ B....
, the union of A and B, designates the set of x such that x ∊ Aoux ∊ B....
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Principles and first applications
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