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Syntax Definition wnel 2431
Description: Extend wff notation to include negated membership.
Hypotheses
Ref Expression
cA class 𝐴
cB class 𝐵
Assertion
Ref Expression
wnel wff 𝐴 ∉ 𝐵
See definition df-nel 2432 for more information.
Colors of variables: wff set class
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