bj-modalb - Mathbox for BJ

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Theorem bj-modalb 32706

Description: A short form of the axiom B of modal logic. (Contributed by BJ, 4-Apr-2021.)

**Assertion**
Ref	Expression
bj-modalb

**Proof of Theorem bj-modalb**
Step	Hyp	Ref	Expression
1		axc7 2132	. 2
2	1	con1i 144	1

Colors of variables: wff setvar class

Syntax hints:

wn 3

wi 4

wal 1481

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1722 ax-4 1737 ax-5 1839 ax-6 1888 ax-7 1935 ax-10 2019 ax-12 2047

This theorem depends on definitions: df-bi 197 df-ex 1705

This theorem is referenced by: (None)