weu - Intuitionistic Logic Explorer

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Syntax Definition weu 2014

Description: Extend wff definition to include existential uniqueness ("there exists a unique 𝑥 such that 𝜑").

**Hypotheses**
Ref	Expression
wph	wff 𝜑
vx	setvar 𝑥

**Assertion**
Ref	Expression
weu	wff ∃!𝑥𝜑

See definition df-eu 2017 for more information.

Colors of variables: wff set class