Theorem ct2 58

Description: Introduce a left conjunct. (Contributed by Mario Carneiro, 30-Sep-2023.)

Hypotheses

Ref	Expression
ct1.1	|- R |= S
ct1.2	|- T:*

Assertion

Ref	Expression
ct2	|- (T, R) |= (T, S)

Proof of Theorem ct2

Step	Hyp	Ref	Expression
1		ct1.2	. . 3 |- T:*
2		ct1.1	. . . 4 |- R |= S
3	2	ax-cb1 29	. . 3 |- R:*
4	1, 3	simpl 22	. 2 |- (T, R) |= T
5	2, 1	adantl 56	. 2 |- (T, R) |= S
6	4, 5	jca 18	1 |- (T, R) |= (T, S)

This proof depends on syntax axioms:  *hb 3  kct 10   |= wffMMJ2 11  wffMMJ2t 12

This proof depends on axioms:  ax-syl 15  ax-jca 17  ax-simpl 20  ax-simpr 21  ax-cb1 29  ax-wctl 31  ax-wctr 32

This theorem is used by: (None)