Metamath Proof Explorer


Theorem bnj707

Description: /\ -manipulation. (Contributed by Jonathan Ben-Naim, 3-Jun-2011) (New usage is discouraged.)

Ref Expression
Hypothesis bnj707.1 χτ
Assertion bnj707 φψχθτ

Proof

Step Hyp Ref Expression
1 bnj707.1 χτ
2 bnj258 φψχθφψθχ
3 2 simprbi φψχθχ
4 3 1 syl φψχθτ