Definition df-li 62

Description: Definition of linear implication.

Assertion

Ref	Expression
df-li	⊦ ((𝜑 ⊸ 𝜓) ⧟ (~ 𝜑 ⅋ 𝜓))

Detailed syntax breakdown of Definition df-li

Step	Hyp	Ref	Expression
1		wph	. . 3 wff 𝜑
2		wps	. . 3 wff 𝜓
3	1, 2	wli 61	. 2 wff (𝜑 ⊸ 𝜓)
4	1	wneg 3	. . 3 wff ~ 𝜑
5	4, 2	wmd 2	. 2 wff (~ 𝜑 ⅋ 𝜓)
6	3, 5	wlb 55	1 wff ((𝜑 ⊸ 𝜓) ⧟ (~ 𝜑 ⅋ 𝜓))

This definition is referenced by:  dfli1  63  dfli2  64  mdm2  69  syl  75  id  77  dnis  78  dnes  79  lbi1s  87  lbi2s  88  licon  94