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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 7097 | . . . . 5 ⊢ ℂ ∈ V | |
2 | 2pwuninelg 5921 | . . . . 5 ⊢ (ℂ ∈ V → ¬ 𝒫 𝒫 ∪ ℂ ∈ ℂ) | |
3 | 1, 2 | ax-mp 7 | . . . 4 ⊢ ¬ 𝒫 𝒫 ∪ ℂ ∈ ℂ |
4 | df-mnf 7156 | . . . . . 6 ⊢ -∞ = 𝒫 +∞ | |
5 | df-pnf 7155 | . . . . . . 7 ⊢ +∞ = 𝒫 ∪ ℂ | |
6 | 5 | pweqi 3386 | . . . . . 6 ⊢ 𝒫 +∞ = 𝒫 𝒫 ∪ ℂ |
7 | 4, 6 | eqtri 2101 | . . . . 5 ⊢ -∞ = 𝒫 𝒫 ∪ ℂ |
8 | 7 | eleq1i 2144 | . . . 4 ⊢ (-∞ ∈ ℂ ↔ 𝒫 𝒫 ∪ ℂ ∈ ℂ) |
9 | 3, 8 | mtbir 628 | . . 3 ⊢ ¬ -∞ ∈ ℂ |
10 | recn 7106 | . . 3 ⊢ (-∞ ∈ ℝ → -∞ ∈ ℂ) | |
11 | 9, 10 | mto 620 | . 2 ⊢ ¬ -∞ ∈ ℝ |
12 | 11 | nelir 2342 | 1 ⊢ -∞ ∉ ℝ |
Colors of variables: wff set class |
Syntax hints: ¬ wn 3 ∈ wcel 1433 ∉ wnel 2339 Vcvv 2601 𝒫 cpw 3382 ∪ cuni 3601 ℂcc 6979 ℝcr 6980 +∞cpnf 7150 -∞cmnf 7151 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 104 ax-ia2 105 ax-ia3 106 ax-in1 576 ax-in2 577 ax-io 662 ax-5 1376 ax-7 1377 ax-gen 1378 ax-ie1 1422 ax-ie2 1423 ax-8 1435 ax-10 1436 ax-11 1437 ax-i12 1438 ax-bndl 1439 ax-4 1440 ax-17 1459 ax-i9 1463 ax-ial 1467 ax-i5r 1468 ax-ext 2063 ax-setind 4280 ax-cnex 7067 ax-resscn 7068 |
This theorem depends on definitions: df-bi 115 df-3an 921 df-tru 1287 df-nf 1390 df-sb 1686 df-clab 2068 df-cleq 2074 df-clel 2077 df-nfc 2208 df-nel 2340 df-ral 2353 df-v 2603 df-dif 2975 df-un 2977 df-in 2979 df-ss 2986 df-pw 3384 df-sn 3404 df-pr 3405 df-uni 3602 df-pnf 7155 df-mnf 7156 |
This theorem is referenced by: renemnf 7167 xrltnr 8855 nltmnf 8863 |
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