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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 9469 | . 2 ⊢ (𝐴 ∈ ℕ0* → 𝐴 ∈ ℝ*) | |
| 2 | xnn0nemnf 9475 | . 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 2202 ≠ wne 2402 -∞cmnf 8211 ℝ*cxr 8212 ℕ0*cxnn0 9464 |
| 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 716 ax-5 1495 ax-7 1496 ax-gen 1497 ax-ie1 1541 ax-ie2 1542 ax-8 1552 ax-10 1553 ax-11 1554 ax-i12 1555 ax-bndl 1557 ax-4 1558 ax-17 1574 ax-i9 1578 ax-ial 1582 ax-i5r 1583 ax-13 2204 ax-14 2205 ax-ext 2213 ax-sep 4207 ax-pow 4264 ax-un 4530 ax-setind 4635 ax-cnex 8122 ax-resscn 8123 ax-1re 8125 ax-addrcl 8128 ax-rnegex 8140 |
| This theorem depends on definitions: df-bi 117 df-3an 1006 df-tru 1400 df-fal 1403 df-nf 1509 df-sb 1811 df-clab 2218 df-cleq 2224 df-clel 2227 df-nfc 2363 df-ne 2403 df-nel 2498 df-ral 2515 df-rex 2516 df-rab 2519 df-v 2804 df-dif 3202 df-un 3204 df-in 3206 df-ss 3213 df-pw 3654 df-sn 3675 df-pr 3676 df-uni 3894 df-int 3929 df-pnf 8215 df-mnf 8216 df-xr 8217 df-inn 9143 df-n0 9402 df-xnn0 9465 |
| This theorem is referenced by: xnn0xadd0 10101 xnn0add4d 10120 |
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