Definition df-vd1 42079

Description: Definition of virtual deduction. (Contributed by Alan Sare, 21-Apr-2011.) (New usage is discouraged.)

Assertion

Ref	Expression
df-vd1	⊢ ((   𝜑   ▶   𝜓   ) ↔ (𝜑 → 𝜓))

Detailed syntax breakdown of Definition df-vd1

Step	Hyp	Ref	Expression
1		wph	. . 3 wff 𝜑
2		wps	. . 3 wff 𝜓
3	1, 2	wvd1 42078	. 2 wff (   𝜑   ▶   𝜓   )
4	1, 2	wi 4	. 2 wff (𝜑 → 𝜓)
5	3, 4	wb 205	1 wff ((   𝜑   ▶   𝜓   ) ↔ (𝜑 → 𝜓))

This definition is referenced by:  in1  42080  dfvd1ir  42082  dfvd1imp  42084  dfvd1impr  42085  dfvd2an  42091  dfvd3an  42103