Metamath Proof Explorer


Definition df-vhc2

Description: Definition of a 2-element virtual hypotheses collection. (Contributed by Alan Sare, 23-Apr-2015) (New usage is discouraged.)

Ref Expression
Assertion df-vhc2 φψφψ

Detailed syntax breakdown

Step Hyp Ref Expression
0 wph wffφ
1 wps wffψ
2 0 1 wvhc2 wffφψ
3 0 1 wa wffφψ
4 2 3 wb wffφψφψ