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Mirrors > Home > ILE Home > Th. List > Mathboxes > walsc | GIF version |
Description: Extend wff definition to include "all some" applied to a class, which means 𝜑 is true for all 𝑥 in 𝐴, and there is at least one 𝑥 in 𝐴. (Contributed by David A. Wheeler, 20-Oct-2018.) |
Ref | Expression |
---|---|
wph | wff 𝜑 |
vx | setvar 𝑥 |
cA | class 𝐴 |
Ref | Expression |
---|---|
walsc | wff ∀!𝑥 ∈ 𝐴𝜑 |
Colors of variables: wff set class |
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