Theorem bj-minftynrr

Description: The extended complex number minfty is not a complex number. (Contributed by BJ, 27-Jun-2019)

	Ref	Expression
Assertion	bj-minftynrr	$$⊢\neg -\infty \in ℂ$$

Proof

Step	Hyp	Ref	Expression
1		df-bj-minfty	$$⊢-\infty =inftyexpi\left(\mathrm{\pi }\right)$$
2		bj-inftyexpidisj	$$⊢\neg inftyexpi\left(\mathrm{\pi }\right)\in ℂ$$
3	1 2	eqneltri	$$⊢\neg -\infty \in ℂ$$