Actually, though, set-builder notation can use the equals sign to express a condition. e.g. the examples here https://en.wikipedia.org/wiki/Set-builder_notation

Actually, though, set-builder notation can use the equals sign to express a condition. e.g. the examples here https://en.wikipedia.org/wiki/Set-builder_notation https://en.wikipedia.org/wiki/Set-builder_notation. Maybe there are other examples in math.