Theorem 3ianorr 1240

Description: Triple disjunction implies negated triple conjunction. (Contributed by Jim Kingdon, 23-Dec-2018.)

Assertion

Ref	Expression
3ianorr	|- ( ( -. ph \/ -. ps \/ -. ch ) -> -. ( ph /\ ps /\ ch ) )

Proof of Theorem 3ianorr

Step	Hyp	Ref	Expression
1		simp1 938	. . 3 |- ( ( ph /\ ps /\ ch ) -> ph )
2	1	con3i 594	. 2 |- ( -. ph -> -. ( ph /\ ps /\ ch ) )
3		simp2 939	. . 3 |- ( ( ph /\ ps /\ ch ) -> ps )
4	3	con3i 594	. 2 |- ( -. ps -> -. ( ph /\ ps /\ ch ) )
5		simp3 940	. . 3 |- ( ( ph /\ ps /\ ch ) -> ch )
6	5	con3i 594	. 2 |- ( -. ch -> -. ( ph /\ ps /\ ch ) )
7	2, 4, 6	3jaoi 1234	1 |- ( ( -. ph \/ -. ps \/ -. ch ) -> -. ( ph /\ ps /\ ch ) )

Syntax hints:   -. wn 3   -> wi 4   \/ w3o 918   /\ w3a 919

This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 104  ax-ia2 105  ax-ia3 106  ax-in1 576  ax-in2 577  ax-io 662

This theorem depends on definitions:  df-bi 115  df-3or 920  df-3an 921

This theorem is referenced by:  funtpg  4970