Theorem el3v12

Description: New way ( elv , and the theorems beginning with "el2v" or "el3v") to shorten some proofs. (Contributed by Peter Mazsa, 11-Jul-2021)

	Ref	Expression
Hypothesis	el3v12.1	$$⊢\left(x\in \mathrm{V}\wedge y\in \mathrm{V}\wedge \chi \right)\to \theta$$
Assertion	el3v12	$$⊢\chi \to \theta$$

Proof

Step	Hyp	Ref	Expression
1		el3v12.1	$$⊢\left(x\in \mathrm{V}\wedge y\in \mathrm{V}\wedge \chi \right)\to \theta$$
2	1	el3v1	$$⊢\left(y\in \mathrm{V}\wedge \chi \right)\to \theta$$
3	2	el2v1	$$⊢\chi \to \theta$$