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Mirrors > Home > ILE Home > Th. List > Mathboxes > walsi | GIF version |
Description: Extend wff definition to include "all some" applied to a top-level implication, which means 𝜓 is true whenever 𝜑 is true, and there is at least least one 𝑥 where 𝜑 is true. (Contributed by David A. Wheeler, 20-Oct-2018.) |
Ref | Expression |
---|---|
wph | wff 𝜑 |
wps | wff 𝜓 |
vx | setvar 𝑥 |
Ref | Expression |
---|---|
walsi | wff ∀!𝑥(𝜑 → 𝜓) |
Colors of variables: wff set class |
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