Definition df-fal 1582

Description: Definition of the truth value "false", or "falsum", denoted by ⊥. See also df-tru 1572. (Contributed by Anthony Hart, 22-Oct-2010.)

Assertion

Ref	Expression
df-fal	⊢ (⊥ ↔ ¬ ⊤)

Detailed syntax breakdown of Definition df-fal

Step	Hyp	Ref	Expression
1		wfal 1581	. 2 wff ⊥
2		wtru 1570	. . 3 wff ⊤
3	2	wn 3	. 2 wff ¬ ⊤
4	1, 3	wb 209	1 wff (⊥ ↔ ¬ ⊤)

This definition is used by:  fal  1583  nottru  1596  trunortru  1618  trunorfal  1619  empty  1938  bj-fal  37480  bj-cbvaew  37585  ralfal  46218