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Definition df-bj-pinfty 34394
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
StepHypRef Expression
1 cpinfty 34393 . 2 class +∞
2 cc0 10525 . . 3 class 0
3 cinftyexpi 34380 . . 3 class +∞ei
42, 3cfv 6348 . 2 class (+∞ei‘0)
51, 4wceq 1528 1 wff +∞ = (+∞ei‘0)
Colors of variables: wff setvar class
This definition is referenced by:  bj-pinftyccb  34395  bj-pinftynrr  34396  bj-pinftynminfty  34401
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