Theorem ttcexbi

Description: A class is a set iff its transitive closure is a set, assuming Transitive Containment. (Contributed by Matthew House, 6-Apr-2026)

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

Proof

Step	Hyp	Ref	Expression
1		ttcexg	Could not format ( A e. _V -> TC+ A e. _V ) : No typesetting found for |- ( A e. _V -> TC+ A e. _V ) with typecode |-
2		ttcexrg	Could not format ( TC+ A e. _V -> A e. _V ) : No typesetting found for |- ( TC+ A e. _V -> A e. _V ) with typecode |-
3	1 2	impbii	Could not format ( A e. _V <-> TC+ A e. _V ) : No typesetting found for |- ( A e. _V <-> TC+ A e. _V ) with typecode |-