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X-Parameters by Jason Horn, Jan Verspecht, David E. Root

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Appendix A: Notations and general definitions

A.1 Sets

{x1, x2, x3}

a set of elements (curly brackets)

U+2115

the set of natural numbers: {1, 2, . . .}

U+2115*

the set of natural numbers, including zero: {0, 1, 2, . . .}

ℕ*=ℕ∪{0}(A.1)
U+2124

the set of integer numbers: {. . ., −2, −1, 0, 1, 2, . . .}

the set of real numbers

+

the set of real positive numbers

the set of real negative numbers ...

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