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| Mirrors > Home > ILE Home > Th. List > iccen | GIF version | ||
| Description: Any nontrivial closed interval is equinumerous to the unit interval. (Contributed by Mario Carneiro, 26-Jul-2014.) (Revised by Mario Carneiro, 8-Sep-2015.) |
| Ref | Expression |
|---|---|
| iccen | ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 𝐴 < 𝐵) → (0[,]1) ≈ (𝐴[,]𝐵)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | reex 8089 | . . 3 ⊢ ℝ ∈ V | |
| 2 | unitssre 10157 | . . 3 ⊢ (0[,]1) ⊆ ℝ | |
| 3 | 1, 2 | ssexi 4193 | . 2 ⊢ (0[,]1) ∈ V |
| 4 | iccssre 10107 | . . . 4 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝐴[,]𝐵) ⊆ ℝ) | |
| 5 | ssexg 4194 | . . . 4 ⊢ (((𝐴[,]𝐵) ⊆ ℝ ∧ ℝ ∈ V) → (𝐴[,]𝐵) ∈ V) | |
| 6 | 4, 1, 5 | sylancl 413 | . . 3 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝐴[,]𝐵) ∈ V) |
| 7 | 6 | 3adant3 1020 | . 2 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 𝐴 < 𝐵) → (𝐴[,]𝐵) ∈ V) |
| 8 | eqid 2206 | . . . 4 ⊢ (𝑥 ∈ (0[,]1) ↦ ((𝑥 · 𝐵) + ((1 − 𝑥) · 𝐴))) = (𝑥 ∈ (0[,]1) ↦ ((𝑥 · 𝐵) + ((1 − 𝑥) · 𝐴))) | |
| 9 | 8 | iccf1o 10156 | . . 3 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 𝐴 < 𝐵) → ((𝑥 ∈ (0[,]1) ↦ ((𝑥 · 𝐵) + ((1 − 𝑥) · 𝐴))):(0[,]1)–1-1-onto→(𝐴[,]𝐵) ∧ ◡(𝑥 ∈ (0[,]1) ↦ ((𝑥 · 𝐵) + ((1 − 𝑥) · 𝐴))) = (𝑦 ∈ (𝐴[,]𝐵) ↦ ((𝑦 − 𝐴) / (𝐵 − 𝐴))))) |
| 10 | 9 | simpld 112 | . 2 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 𝐴 < 𝐵) → (𝑥 ∈ (0[,]1) ↦ ((𝑥 · 𝐵) + ((1 − 𝑥) · 𝐴))):(0[,]1)–1-1-onto→(𝐴[,]𝐵)) |
| 11 | f1oen2g 6864 | . 2 ⊢ (((0[,]1) ∈ V ∧ (𝐴[,]𝐵) ∈ V ∧ (𝑥 ∈ (0[,]1) ↦ ((𝑥 · 𝐵) + ((1 − 𝑥) · 𝐴))):(0[,]1)–1-1-onto→(𝐴[,]𝐵)) → (0[,]1) ≈ (𝐴[,]𝐵)) | |
| 12 | 3, 7, 10, 11 | mp3an2i 1355 | 1 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 𝐴 < 𝐵) → (0[,]1) ≈ (𝐴[,]𝐵)) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∧ wa 104 ∧ w3a 981 = wceq 1373 ∈ wcel 2177 Vcvv 2773 ⊆ wss 3170 class class class wbr 4054 ↦ cmpt 4116 ◡ccnv 4687 –1-1-onto→wf1o 5284 (class class class)co 5962 ≈ cen 6843 ℝcr 7954 0cc0 7955 1c1 7956 + caddc 7958 · cmul 7960 < clt 8137 − cmin 8273 / cdiv 8775 [,]cicc 10043 |
| 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-pr 4264 ax-un 4493 ax-setind 4598 ax-cnex 8046 ax-resscn 8047 ax-1cn 8048 ax-1re 8049 ax-icn 8050 ax-addcl 8051 ax-addrcl 8052 ax-mulcl 8053 ax-mulrcl 8054 ax-addcom 8055 ax-mulcom 8056 ax-addass 8057 ax-mulass 8058 ax-distr 8059 ax-i2m1 8060 ax-0lt1 8061 ax-1rid 8062 ax-0id 8063 ax-rnegex 8064 ax-precex 8065 ax-cnre 8066 ax-pre-ltirr 8067 ax-pre-ltwlin 8068 ax-pre-lttrn 8069 ax-pre-apti 8070 ax-pre-ltadd 8071 ax-pre-mulgt0 8072 ax-pre-mulext 8073 |
| This theorem depends on definitions: df-bi 117 df-3or 982 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-reu 2492 df-rmo 2493 df-rab 2494 df-v 2775 df-sbc 3003 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 3860 df-br 4055 df-opab 4117 df-mpt 4118 df-id 4353 df-po 4356 df-iso 4357 df-xp 4694 df-rel 4695 df-cnv 4696 df-co 4697 df-dm 4698 df-rn 4699 df-iota 5246 df-fun 5287 df-fn 5288 df-f 5289 df-f1 5290 df-fo 5291 df-f1o 5292 df-fv 5293 df-riota 5917 df-ov 5965 df-oprab 5966 df-mpo 5967 df-en 6846 df-pnf 8139 df-mnf 8140 df-xr 8141 df-ltxr 8142 df-le 8143 df-sub 8275 df-neg 8276 df-reap 8678 df-ap 8685 df-div 8776 df-rp 9806 df-icc 10047 |
| This theorem is referenced by: (None) |
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