Last Update: 25 October 2010
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∃ 2 possible ways to continue this definition:
& one 2-place relation between them ("set membership"):
{x | P(x)} for: the set of all x (in the domain) s.t. P(x)
S = {0,1,2,3,4} (extensional description)
= {x | (x ∈ N) ^
(x ≤ 4)} (intensional description)
∴ W ⊆ N^{+} ⊆ N ⊆ Z ⊆ Q ⊆ R ⊆ C.