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| Mirrors > Home > MPE Home > Th. List > Mathboxes > bj-minftynrr | Structured version Visualization version GIF version | ||
| Description: The extended complex number -∞ is not a complex number. (Contributed by BJ, 27-Jun-2019.) |
| Ref | Expression |
|---|---|
| bj-minftynrr | ⊢ ¬ -∞ ∈ ℂ |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-bj-minfty 37257 | . 2 ⊢ -∞ = (+∞ei‘π) | |
| 2 | bj-inftyexpidisj 37243 | . 2 ⊢ ¬ (+∞ei‘π) ∈ ℂ | |
| 3 | 1, 2 | eqneltri 2850 | 1 ⊢ ¬ -∞ ∈ ℂ |
| Colors of variables: wff setvar class |
| Syntax hints: ¬ wn 3 ∈ wcel 2111 ‘cfv 6481 ℂcc 11001 πcpi 15970 +∞eicinftyexpi 37239 -∞cminfty 37256 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1968 ax-7 2009 ax-8 2113 ax-9 2121 ax-10 2144 ax-11 2160 ax-12 2180 ax-ext 2703 ax-sep 5234 ax-nul 5244 ax-pr 5370 ax-un 7668 ax-reg 9478 ax-cnex 11059 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1544 df-fal 1554 df-ex 1781 df-nf 1785 df-sb 2068 df-mo 2535 df-eu 2564 df-clab 2710 df-cleq 2723 df-clel 2806 df-nfc 2881 df-ne 2929 df-ral 3048 df-rex 3057 df-rab 3396 df-v 3438 df-dif 3905 df-un 3907 df-in 3909 df-ss 3919 df-nul 4284 df-if 4476 df-sn 4577 df-pr 4579 df-tp 4581 df-op 4583 df-uni 4860 df-br 5092 df-opab 5154 df-mpt 5173 df-id 5511 df-xp 5622 df-rel 5623 df-cnv 5624 df-co 5625 df-dm 5626 df-iota 6437 df-fun 6483 df-fn 6484 df-fv 6489 df-c 11009 df-bj-inftyexpi 37240 df-bj-minfty 37257 |
| This theorem is referenced by: (None) |
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