The diameter of the subset C of the metric space B, D is the least upper bound of {D(x, y) | x, y Є C} and is often written as d(C).
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The ratio is pi, a transcendental number, which is a subset of irrational numbers. pi is approximately equal to 3.14159
the difference between a subset and a proper subset
Since ASCII ⊊ unicode, I don't know if there are ASCII codes for subset and proper subset. There are Unicode characters for subset and proper subset though: Subset: ⊂, ⊂, ⊂ Subset (or equal): ⊆, ⊆, ⊆ Proper subset: ⊊, ⊊,
give example of subset
A subset of a set S can be S itself. A proper subset cannot.