Set/Examples/Positive Integers Less than 10

Example of Set

The (strictly) positive integers less than $10$ form a set:

$\set {1, 2, 3, 4, 5, 6, 7, 8, 9}$

Sources

• 1963: Morris Tenenbaum and Harry Pollard: Ordinary Differential Equations ... (previous) ... (next): Chapter $1$: Basic Concepts: Lesson $2 \text A$: The Meaning of the Term Set