TheoremBase

Intervals of Natural Numbers

For natural numbers with zero m and n, the interval {m,...,n} consists of the k with m ≤ k ≤ n, and [n] denotes {1,...,n}.

Statement

In the setting of The Natural Numbers and the Natural Numbers with Zero: Arithmetic, Order, Induction and Recursion, let m,n∈N0m,n\in\mathbb{N}_{0}.

The interval from mm to nn is {m,…,n}={k∈N0:m≤k≤n}\{m,\dots,n\}=\{k\in\mathbb{N}_{0}:m\le k\le n\}.

[n][n] denotes {1,…,n}\{1,\dots,n\}.

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