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| Mirrors > Home > ILE Home > Th. List > xnn0xrnemnf | GIF version | ||
| Description: The extended nonnegative integers are extended reals without negative infinity. (Contributed by AV, 10-Dec-2020.) |
| Ref | Expression |
|---|---|
| xnn0xrnemnf | ⊢ (𝐴 ∈ ℕ0* → (𝐴 ∈ ℝ* ∧ 𝐴 ≠ -∞)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | xnn0xr 9393 | . 2 ⊢ (𝐴 ∈ ℕ0* → 𝐴 ∈ ℝ*) | |
| 2 | xnn0nemnf 9399 | . 2 ⊢ (𝐴 ∈ ℕ0* → 𝐴 ≠ -∞) | |
| 3 | 1, 2 | jca 306 | 1 ⊢ (𝐴 ∈ ℕ0* → (𝐴 ∈ ℝ* ∧ 𝐴 ≠ -∞)) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∧ wa 104 ∈ wcel 2177 ≠ wne 2377 -∞cmnf 8135 ℝ*cxr 8136 ℕ0*cxnn0 9388 |
| 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 615 ax-in2 616 ax-io 711 ax-5 1471 ax-7 1472 ax-gen 1473 ax-ie1 1517 ax-ie2 1518 ax-8 1528 ax-10 1529 ax-11 1530 ax-i12 1531 ax-bndl 1533 ax-4 1534 ax-17 1550 ax-i9 1554 ax-ial 1558 ax-i5r 1559 ax-13 2179 ax-14 2180 ax-ext 2188 ax-sep 4173 ax-pow 4229 ax-un 4493 ax-setind 4598 ax-cnex 8046 ax-resscn 8047 ax-1re 8049 ax-addrcl 8052 ax-rnegex 8064 |
| This theorem depends on definitions: df-bi 117 df-3an 983 df-tru 1376 df-fal 1379 df-nf 1485 df-sb 1787 df-clab 2193 df-cleq 2199 df-clel 2202 df-nfc 2338 df-ne 2378 df-nel 2473 df-ral 2490 df-rex 2491 df-rab 2494 df-v 2775 df-dif 3172 df-un 3174 df-in 3176 df-ss 3183 df-pw 3623 df-sn 3644 df-pr 3645 df-uni 3860 df-int 3895 df-pnf 8139 df-mnf 8140 df-xr 8141 df-inn 9067 df-n0 9326 df-xnn0 9389 |
| This theorem is referenced by: xnn0xadd0 10019 xnn0add4d 10038 |
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