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| Mirrors > Home > MPE Home > Th. List > supicclub | Structured version Visualization version GIF version | ||
| Description: The supremum of a bounded set of real numbers is the least upper bound. (Contributed by Thierry Arnoux, 23-May-2019.) |
| Ref | Expression |
|---|---|
| supicc.1 | ⊢ (𝜑 → 𝐵 ∈ ℝ) |
| supicc.2 | ⊢ (𝜑 → 𝐶 ∈ ℝ) |
| supicc.3 | ⊢ (𝜑 → 𝐴 ⊆ (𝐵[,]𝐶)) |
| supicc.4 | ⊢ (𝜑 → 𝐴 ≠ ∅) |
| supiccub.1 | ⊢ (𝜑 → 𝐷 ∈ 𝐴) |
| Ref | Expression |
|---|---|
| supicclub | ⊢ (𝜑 → (𝐷 < sup(𝐴, ℝ, < ) ↔ ∃𝑧 ∈ 𝐴 𝐷 < 𝑧)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | supicc.3 | . . 3 ⊢ (𝜑 → 𝐴 ⊆ (𝐵[,]𝐶)) | |
| 2 | supicc.1 | . . . 4 ⊢ (𝜑 → 𝐵 ∈ ℝ) | |
| 3 | supicc.2 | . . . 4 ⊢ (𝜑 → 𝐶 ∈ ℝ) | |
| 4 | iccssre 13371 | . . . 4 ⊢ ((𝐵 ∈ ℝ ∧ 𝐶 ∈ ℝ) → (𝐵[,]𝐶) ⊆ ℝ) | |
| 5 | 2, 3, 4 | syl2anc 585 | . . 3 ⊢ (𝜑 → (𝐵[,]𝐶) ⊆ ℝ) |
| 6 | 1, 5 | sstrd 3927 | . 2 ⊢ (𝜑 → 𝐴 ⊆ ℝ) |
| 7 | supicc.4 | . 2 ⊢ (𝜑 → 𝐴 ≠ ∅) | |
| 8 | 2 | adantr 480 | . . . . . 6 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝐵 ∈ ℝ) |
| 9 | 8 | rexrd 11184 | . . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝐵 ∈ ℝ*) |
| 10 | 3 | adantr 480 | . . . . . 6 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝐶 ∈ ℝ) |
| 11 | 10 | rexrd 11184 | . . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝐶 ∈ ℝ*) |
| 12 | 1 | sselda 3917 | . . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝑥 ∈ (𝐵[,]𝐶)) |
| 13 | iccleub 13343 | . . . . 5 ⊢ ((𝐵 ∈ ℝ* ∧ 𝐶 ∈ ℝ* ∧ 𝑥 ∈ (𝐵[,]𝐶)) → 𝑥 ≤ 𝐶) | |
| 14 | 9, 11, 12, 13 | syl3anc 1374 | . . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝑥 ≤ 𝐶) |
| 15 | 14 | ralrimiva 3127 | . . 3 ⊢ (𝜑 → ∀𝑥 ∈ 𝐴 𝑥 ≤ 𝐶) |
| 16 | brralrspcev 5134 | . . 3 ⊢ ((𝐶 ∈ ℝ ∧ ∀𝑥 ∈ 𝐴 𝑥 ≤ 𝐶) → ∃𝑦 ∈ ℝ ∀𝑥 ∈ 𝐴 𝑥 ≤ 𝑦) | |
| 17 | 3, 15, 16 | syl2anc 585 | . 2 ⊢ (𝜑 → ∃𝑦 ∈ ℝ ∀𝑥 ∈ 𝐴 𝑥 ≤ 𝑦) |
| 18 | supiccub.1 | . . 3 ⊢ (𝜑 → 𝐷 ∈ 𝐴) | |
| 19 | 6, 18 | sseldd 3918 | . 2 ⊢ (𝜑 → 𝐷 ∈ ℝ) |
| 20 | suprlub 12109 | . 2 ⊢ (((𝐴 ⊆ ℝ ∧ 𝐴 ≠ ∅ ∧ ∃𝑦 ∈ ℝ ∀𝑥 ∈ 𝐴 𝑥 ≤ 𝑦) ∧ 𝐷 ∈ ℝ) → (𝐷 < sup(𝐴, ℝ, < ) ↔ ∃𝑧 ∈ 𝐴 𝐷 < 𝑧)) | |
| 21 | 6, 7, 17, 19, 20 | syl31anc 1376 | 1 ⊢ (𝜑 → (𝐷 < sup(𝐴, ℝ, < ) ↔ ∃𝑧 ∈ 𝐴 𝐷 < 𝑧)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ↔ wb 206 ∧ wa 395 ∈ wcel 2114 ≠ wne 2930 ∀wral 3049 ∃wrex 3059 ⊆ wss 3885 ∅c0 4263 class class class wbr 5074 (class class class)co 7356 supcsup 9342 ℝcr 11026 ℝ*cxr 11167 < clt 11168 ≤ cle 11169 [,]cicc 13290 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2184 ax-ext 2707 ax-sep 5220 ax-nul 5230 ax-pow 5296 ax-pr 5364 ax-un 7678 ax-cnex 11083 ax-resscn 11084 ax-1cn 11085 ax-icn 11086 ax-addcl 11087 ax-addrcl 11088 ax-mulcl 11089 ax-mulrcl 11090 ax-mulcom 11091 ax-addass 11092 ax-mulass 11093 ax-distr 11094 ax-i2m1 11095 ax-1ne0 11096 ax-1rid 11097 ax-rnegex 11098 ax-rrecex 11099 ax-cnre 11100 ax-pre-lttri 11101 ax-pre-lttrn 11102 ax-pre-ltadd 11103 ax-pre-mulgt0 11104 ax-pre-sup 11105 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3or 1088 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2538 df-eu 2568 df-clab 2714 df-cleq 2727 df-clel 2810 df-nfc 2884 df-ne 2931 df-nel 3035 df-ral 3050 df-rex 3060 df-rmo 3340 df-reu 3341 df-rab 3388 df-v 3429 df-sbc 3726 df-csb 3834 df-dif 3888 df-un 3890 df-in 3892 df-ss 3902 df-nul 4264 df-if 4457 df-pw 4533 df-sn 4558 df-pr 4560 df-op 4564 df-uni 4841 df-br 5075 df-opab 5137 df-mpt 5156 df-id 5515 df-po 5528 df-so 5529 df-xp 5626 df-rel 5627 df-cnv 5628 df-co 5629 df-dm 5630 df-rn 5631 df-res 5632 df-ima 5633 df-iota 6443 df-fun 6489 df-fn 6490 df-f 6491 df-f1 6492 df-fo 6493 df-f1o 6494 df-fv 6495 df-riota 7313 df-ov 7359 df-oprab 7360 df-mpo 7361 df-er 8632 df-en 8883 df-dom 8884 df-sdom 8885 df-sup 9344 df-pnf 11170 df-mnf 11171 df-xr 11172 df-ltxr 11173 df-le 11174 df-sub 11368 df-neg 11369 df-icc 13294 |
| This theorem is referenced by: supicclub2 13446 |
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