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| Mirrors > Home > ILE Home > Th. List > zgt1rpn0n1 | GIF version | ||
| Description: An integer greater than 1 is a positive real number not equal to 0 or 1. Useful for working with integer logarithm bases (which is a common case, e.g., base 2, base 3, or base 10). (Contributed by Thierry Arnoux, 26-Sep-2017.) (Proof shortened by AV, 9-Jul-2022.) |
| Ref | Expression |
|---|---|
| zgt1rpn0n1 | ⊢ (𝐵 ∈ (ℤ≥‘2) → (𝐵 ∈ ℝ+ ∧ 𝐵 ≠ 0 ∧ 𝐵 ≠ 1)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eluz2nn 9966 | . . 3 ⊢ (𝐵 ∈ (ℤ≥‘2) → 𝐵 ∈ ℕ) | |
| 2 | 1 | nnrpd 10095 | . 2 ⊢ (𝐵 ∈ (ℤ≥‘2) → 𝐵 ∈ ℝ+) |
| 3 | eluz2n0 9971 | . 2 ⊢ (𝐵 ∈ (ℤ≥‘2) → 𝐵 ≠ 0) | |
| 4 | 1nuz2 10006 | . . 3 ⊢ ¬ 1 ∈ (ℤ≥‘2) | |
| 5 | nelne2 2511 | . . 3 ⊢ ((𝐵 ∈ (ℤ≥‘2) ∧ ¬ 1 ∈ (ℤ≥‘2)) → 𝐵 ≠ 1) | |
| 6 | 4, 5 | mpan2 429 | . 2 ⊢ (𝐵 ∈ (ℤ≥‘2) → 𝐵 ≠ 1) |
| 7 | 2, 3, 6 | 3jca 1208 | 1 ⊢ (𝐵 ∈ (ℤ≥‘2) → (𝐵 ∈ ℝ+ ∧ 𝐵 ≠ 0 ∧ 𝐵 ≠ 1)) |
| Colors of variables: wff set class |
| This proof depends on syntax axioms: ¬ wn 3 → wi 4 ∧ w3a 1009 ∈ wcel 2209 ≠ wne 2420 ‘cfv 5377 0cc0 8179 1c1 8180 2c2 9355 ℤ≥cuz 9921 ℝ+crp 10054 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 623 ax-in2 624 ax-io 721 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-10 1558 ax-11 1559 ax-i12 1560 ax-bndl 1562 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-14 2212 ax-ext 2220 ax-sep 4249 ax-pow 4311 ax-pr 4346 ax-un 4578 ax-setind 4684 ax-cnex 8270 ax-resscn 8271 ax-1cn 8272 ax-1re 8273 ax-icn 8274 ax-addcl 8275 ax-addrcl 8276 ax-mulcl 8277 ax-addcom 8279 ax-addass 8281 ax-distr 8283 ax-i2m1 8284 ax-0lt1 8285 ax-0id 8287 ax-rnegex 8288 ax-cnre 8290 ax-pre-ltirr 8291 ax-pre-ltwlin 8292 ax-pre-lttrn 8293 ax-pre-ltadd 8295 |
| This proof depends on definitions: df-bi 117 df-3or 1010 df-3an 1011 df-tru 1405 df-fal 1408 df-nf 1514 df-sb 1816 df-eu 2089 df-mo 2090 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-ne 2421 df-nel 2516 df-ral 2533 df-rex 2534 df-reu 2535 df-rab 2537 df-v 2823 df-sbc 3052 df-dif 3222 df-un 3224 df-in 3226 df-ss 3233 df-pw 3690 df-sn 3715 df-pr 3716 df-op 3718 df-uni 3936 df-int 3971 df-br 4131 df-opab 4193 df-mpt 4194 df-id 4438 df-xp 4780 df-rel 4781 df-cnv 4782 df-co 4783 df-dm 4784 df-rn 4785 df-res 4786 df-ima 4787 df-iota 5337 df-fun 5379 df-fn 5380 df-f 5381 df-fv 5385 df-riota 6038 df-ov 6088 df-oprab 6089 df-mpo 6090 df-pnf 8362 df-mnf 8363 df-xr 8364 df-ltxr 8365 df-le 8366 df-sub 8499 df-neg 8500 df-inn 9305 df-2 9363 df-n0 9564 df-z 9645 df-uz 9922 df-rp 10055 |
| This theorem is used by: relogbval 16053 relogbzcl 16054 nnlogbexp 16061 |
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