Definition df-bj-pinfty 37897

Description: Definition of "plus infinity". (Contributed by BJ, 27-Jun-2019.)

Assertion

Ref	Expression
df-bj-pinfty	⊢ +∞ = (+∞ei‘0)

Detailed syntax breakdown of Definition df-bj-pinfty

Step	Hyp	Ref	Expression
1		cpinfty 37896	. 2 class +∞
2		cc0 11118	. . 3 class 0
3		cinftyexpi 37883	. . 3 class +∞ei
4	2, 3	cfv 6543	. 2 class (+∞ei‘0)
5	1, 4	wceq 1570	1 wff +∞ = (+∞ei‘0)

This definition is used by:  bj-pinftyccb  37898  bj-pinftynrr  37899  bj-pinftynminfty  37904