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Theorem iad1 143
Description: Introduce a (left side). Dual of eac1 141.
Assertion
Ref Expression
iad1 (𝜑 ⊸ (𝜑𝜓))

Proof of Theorem iad1
StepHypRef Expression
Colors of variables: wff var nilad
Syntax hints:  wli 61  wad 131
 WARNING: This theorem has an incomplete proof.
This theorem is referenced by: (None)
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