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| Mirrors > Home > ILE Home > Th. List > ltso | GIF version | ||
| Description: 'Less than' is a strict ordering. (Contributed by NM, 19-Jan-1997.) |
| Ref | Expression |
|---|---|
| ltso | ⊢ < Or ℝ |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ltnr 8169 | . . . . 5 ⊢ (𝑥 ∈ ℝ → ¬ 𝑥 < 𝑥) | |
| 2 | 1 | adantl 277 | . . . 4 ⊢ ((⊤ ∧ 𝑥 ∈ ℝ) → ¬ 𝑥 < 𝑥) |
| 3 | lttr 8166 | . . . . 5 ⊢ ((𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ ∧ 𝑧 ∈ ℝ) → ((𝑥 < 𝑦 ∧ 𝑦 < 𝑧) → 𝑥 < 𝑧)) | |
| 4 | 3 | adantl 277 | . . . 4 ⊢ ((⊤ ∧ (𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ ∧ 𝑧 ∈ ℝ)) → ((𝑥 < 𝑦 ∧ 𝑦 < 𝑧) → 𝑥 < 𝑧)) |
| 5 | 2, 4 | ispod 4359 | . . 3 ⊢ (⊤ → < Po ℝ) |
| 6 | 5 | mptru 1382 | . 2 ⊢ < Po ℝ |
| 7 | axltwlin 8160 | . . 3 ⊢ ((𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ ∧ 𝑧 ∈ ℝ) → (𝑥 < 𝑦 → (𝑥 < 𝑧 ∨ 𝑧 < 𝑦))) | |
| 8 | 7 | rgen3 2594 | . 2 ⊢ ∀𝑥 ∈ ℝ ∀𝑦 ∈ ℝ ∀𝑧 ∈ ℝ (𝑥 < 𝑦 → (𝑥 < 𝑧 ∨ 𝑧 < 𝑦)) |
| 9 | df-iso 4352 | . 2 ⊢ ( < Or ℝ ↔ ( < Po ℝ ∧ ∀𝑥 ∈ ℝ ∀𝑦 ∈ ℝ ∀𝑧 ∈ ℝ (𝑥 < 𝑦 → (𝑥 < 𝑧 ∨ 𝑧 < 𝑦)))) | |
| 10 | 6, 8, 9 | mpbir2an 945 | 1 ⊢ < Or ℝ |
| Colors of variables: wff set class |
| Syntax hints: ¬ wn 3 → wi 4 ∧ wa 104 ∨ wo 710 ∧ w3a 981 ⊤wtru 1374 ∈ wcel 2177 ∀wral 2485 class class class wbr 4051 Po wpo 4349 Or wor 4350 ℝcr 7944 < clt 8127 |
| 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 4170 ax-pow 4226 ax-pr 4261 ax-un 4488 ax-setind 4593 ax-cnex 8036 ax-resscn 8037 ax-pre-ltirr 8057 ax-pre-ltwlin 8058 ax-pre-lttrn 8059 |
| This theorem depends on definitions: df-bi 117 df-3an 983 df-tru 1376 df-fal 1379 df-nf 1485 df-sb 1787 df-eu 2058 df-mo 2059 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-op 3647 df-uni 3857 df-br 4052 df-opab 4114 df-po 4351 df-iso 4352 df-xp 4689 df-pnf 8129 df-mnf 8130 df-ltxr 8132 |
| This theorem is referenced by: gtso 8171 ltnsym2 8183 suprlubex 9045 fimaxq 10994 |
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