MathGloss/S/Set equality

Examples
1. The sets and  are equal since both consist of the five prime numbers 2,3,5,7\, and 11\,. the order in which numbers appear is irrelevant. 2. The sets and  are equal even though, in the first set element $$\alpha\,$$ is listed three times and element $$\omega\,$$ is listed twice. Both sets contain the four elements and no others.