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| Mirrors > Home > ILE Home > Th. List > nn0nepnf | GIF version | ||
| Description: No standard nonnegative integer equals positive infinity. (Contributed by AV, 10-Dec-2020.) |
| Ref | Expression |
|---|---|
| nn0nepnf | ⊢ (𝐴 ∈ ℕ0 → 𝐴 ≠ +∞) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | pnfnre 8331 | . . . . 5 ⊢ +∞ ∉ ℝ | |
| 2 | 1 | neli 2511 | . . . 4 ⊢ ¬ +∞ ∈ ℝ |
| 3 | nn0re 9522 | . . . 4 ⊢ (+∞ ∈ ℕ0 → +∞ ∈ ℝ) | |
| 4 | 2, 3 | mto 668 | . . 3 ⊢ ¬ +∞ ∈ ℕ0 |
| 5 | eleq1 2297 | . . 3 ⊢ (𝐴 = +∞ → (𝐴 ∈ ℕ0 ↔ +∞ ∈ ℕ0)) | |
| 6 | 4, 5 | mtbiri 682 | . 2 ⊢ (𝐴 = +∞ → ¬ 𝐴 ∈ ℕ0) |
| 7 | 6 | necon2ai 2468 | 1 ⊢ (𝐴 ∈ ℕ0 → 𝐴 ≠ +∞) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 = wceq 1398 ∈ wcel 2205 ≠ wne 2414 ℝcr 8142 +∞cpnf 8321 ℕ0cn0 9513 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 619 ax-in2 620 ax-io 717 ax-5 1496 ax-7 1497 ax-gen 1498 ax-ie1 1542 ax-ie2 1543 ax-8 1553 ax-10 1554 ax-11 1555 ax-i12 1556 ax-bndl 1558 ax-4 1559 ax-17 1575 ax-i9 1579 ax-ial 1583 ax-i5r 1584 ax-13 2207 ax-14 2208 ax-ext 2216 ax-sep 4233 ax-un 4559 ax-cnex 8234 ax-resscn 8235 ax-1re 8237 ax-addrcl 8240 ax-rnegex 8252 |
| This theorem depends on definitions: df-bi 117 df-tru 1401 df-fal 1404 df-nf 1510 df-sb 1812 df-clab 2221 df-cleq 2227 df-clel 2230 df-nfc 2375 df-ne 2415 df-nel 2510 df-ral 2527 df-rex 2528 df-rab 2531 df-v 2817 df-un 3218 df-in 3220 df-ss 3227 df-pw 3676 df-sn 3700 df-uni 3920 df-int 3955 df-pnf 8326 df-inn 9255 df-n0 9514 |
| This theorem is referenced by: nn0nepnfd 9590 xnn0nnen 10823 fxnn0nninf 10825 0tonninf 10826 1tonninf 10827 |
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