# 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....

Exclusive to subscribers. 97% yet to be discovered!

You do not have access to this resource.

Click here to request your free trial access!

Already subscribed?
__Log in!__

The Ultimate Scientific and Technical Reference

This article is included in

Mathematics

This offer includes:

Knowledge Base

Updated and enriched with articles validated by our scientific committees

Services

A set of exclusive tools to complement the resources

Practical Path

Operational and didactic, to guarantee the acquisition of transversal skills

Doc & Quiz

Interactive articles with quizzes, for constructive reading

Principles and first applications

## References

Exclusive to subscribers. 97% yet to be discovered!

You do not have access to this resource.

Click here to request your free trial access!

Already subscribed?
__Log in!__

The Ultimate Scientific and Technical Reference