Theorem ontrciOLD

Description: Obsolete version of ontr as of 28-Dec-2024. (Contributed by NM, 11-Jun-1994) (Proof modification is discouraged.) (New usage is discouraged.)

	Ref	Expression
Hypothesis	on.1	$$⊢A\in \mathrm{On}$$
Assertion	ontrciOLD	$$⊢\mathrm{Tr}A$$

Proof

Step	Hyp	Ref	Expression
1		on.1	$$⊢A\in \mathrm{On}$$
2		ontr	$$⊢A\in \mathrm{On}\to \mathrm{Tr}A$$
3	1 2	ax-mp	$$⊢\mathrm{Tr}A$$