Theorem ttctr2

Description: The transitive closure of a class is transitive. (Contributed by Matthew House, 6-Apr-2026)

	Ref	Expression
Assertion	ttctr2	Could not format assertion : No typesetting found for |- ( A e. TC+ B -> A C_ TC+ B ) with typecode |-

Proof

Step	Hyp	Ref	Expression
1		ttctr	Could not format Tr TC+ B : No typesetting found for |- Tr TC+ B with typecode |-
2		trss	Could not format ( Tr TC+ B -> ( A e. TC+ B -> A C_ TC+ B ) ) : No typesetting found for |- ( Tr TC+ B -> ( A e. TC+ B -> A C_ TC+ B ) ) with typecode |-
3	1 2	ax-mp	Could not format ( A e. TC+ B -> A C_ TC+ B ) : No typesetting found for |- ( A e. TC+ B -> A C_ TC+ B ) with typecode |-