Theorem sbtT

Description: A substitution into a theorem remains true. sbt with the existence of no virtual hypotheses for the hypothesis expressed as the empty virtual hypothesis collection. (Contributed by Alan Sare, 4-Feb-2017) (Proof modification is discouraged.) (New usage is discouraged.)

	Ref	Expression
Hypothesis	sbtT.1	|- ( T. -> ph )
Assertion	sbtT	|- [ y / x ] ph

Proof

Step	Hyp	Ref	Expression
1		sbtT.1	|- ( T. -> ph )
2	1	mptru	|- ph
3	2	sbt	|- [ y / x ] ph