Wikipedia: Discrete mathematics

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Discrete math is the mathematics of integers and other countable sets. It is an important foundation of much of computer science. It includes the mathematics used in fields such as:

Discrete mathematics is the mathematics of integers and other countable sets. It is an important foundation of much of computer science. It comprises fields such as:

graph theory
combinatorics
[finite geometry]?
cryptography
- cryptology
- cryptanalysis
information theory
theory of computation
- complexity theory
- computability theory