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Mirrors > Home > ILE Home > Th. List > mnfnre | GIF version |
Description: Minus infinity is not a real number. (Contributed by NM, 13-Oct-2005.) |
Ref | Expression |
---|---|
mnfnre | ⊢ -∞ ∉ ℝ |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | cnex 7744 | . . . . 5 ⊢ ℂ ∈ V | |
2 | 2pwuninelg 6180 | . . . . 5 ⊢ (ℂ ∈ V → ¬ 𝒫 𝒫 ∪ ℂ ∈ ℂ) | |
3 | 1, 2 | ax-mp 5 | . . . 4 ⊢ ¬ 𝒫 𝒫 ∪ ℂ ∈ ℂ |
4 | df-mnf 7803 | . . . . . 6 ⊢ -∞ = 𝒫 +∞ | |
5 | df-pnf 7802 | . . . . . . 7 ⊢ +∞ = 𝒫 ∪ ℂ | |
6 | 5 | pweqi 3514 | . . . . . 6 ⊢ 𝒫 +∞ = 𝒫 𝒫 ∪ ℂ |
7 | 4, 6 | eqtri 2160 | . . . . 5 ⊢ -∞ = 𝒫 𝒫 ∪ ℂ |
8 | 7 | eleq1i 2205 | . . . 4 ⊢ (-∞ ∈ ℂ ↔ 𝒫 𝒫 ∪ ℂ ∈ ℂ) |
9 | 3, 8 | mtbir 660 | . . 3 ⊢ ¬ -∞ ∈ ℂ |
10 | recn 7753 | . . 3 ⊢ (-∞ ∈ ℝ → -∞ ∈ ℂ) | |
11 | 9, 10 | mto 651 | . 2 ⊢ ¬ -∞ ∈ ℝ |
12 | 11 | nelir 2406 | 1 ⊢ -∞ ∉ ℝ |
Colors of variables: wff set class |
Syntax hints: ¬ wn 3 ∈ wcel 1480 ∉ wnel 2403 Vcvv 2686 𝒫 cpw 3510 ∪ cuni 3736 ℂcc 7618 ℝcr 7619 +∞cpnf 7797 -∞cmnf 7798 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 603 ax-in2 604 ax-io 698 ax-5 1423 ax-7 1424 ax-gen 1425 ax-ie1 1469 ax-ie2 1470 ax-8 1482 ax-10 1483 ax-11 1484 ax-i12 1485 ax-bndl 1486 ax-4 1487 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-ext 2121 ax-setind 4452 ax-cnex 7711 ax-resscn 7712 |
This theorem depends on definitions: df-bi 116 df-3an 964 df-tru 1334 df-nf 1437 df-sb 1736 df-clab 2126 df-cleq 2132 df-clel 2135 df-nfc 2270 df-nel 2404 df-ral 2421 df-v 2688 df-dif 3073 df-un 3075 df-in 3077 df-ss 3084 df-pw 3512 df-sn 3533 df-pr 3534 df-uni 3737 df-pnf 7802 df-mnf 7803 |
This theorem is referenced by: renemnf 7814 xrltnr 9566 nltmnf 9574 |
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