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Mirrors > Home > MPE Home > Th. List > Mathboxes > df-bj-pinfty | Structured version Visualization version GIF version |
Description: Definition of "plus infinity". (Contributed by BJ, 27-Jun-2019.) |
Ref | Expression |
---|---|
df-bj-pinfty | ⊢ +∞ = (+∞ei‘0) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | cpinfty 34505 | . 2 class +∞ | |
2 | cc0 10540 | . . 3 class 0 | |
3 | cinftyexpi 34492 | . . 3 class +∞ei | |
4 | 2, 3 | cfv 6358 | . 2 class (+∞ei‘0) |
5 | 1, 4 | wceq 1536 | 1 wff +∞ = (+∞ei‘0) |
Colors of variables: wff setvar class |
This definition is referenced by: bj-pinftyccb 34507 bj-pinftynrr 34508 bj-pinftynminfty 34513 |
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