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Mirrors > Home > NFE Home > Th. List > wss | GIF version |
Description: Extend wff notation to include the subclass relation. This is read "A is a subclass of B " or "B includes A." When A exists as a set, it is also read "A is a subset of B." |
Ref | Expression |
---|---|
cA | class A |
cB | class B |
Ref | Expression |
---|---|
wss | wff A ⊆ B |
Colors of variables: wff setvar class |
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