Theorem fald

Description: Refutation of falsity, in deduction form. (Contributed by Giovanni Mascellani, 24-Mar-2018)

	Ref	Expression
Assertion	fald	$$⊢\theta \to \neg \perp$$

Proof

Step	Hyp	Ref	Expression
1		fal	$$⊢\neg \perp$$
2	1	a1i	$$⊢\theta \to \neg \perp$$