Mathbox for Glauco Siliprandi |
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Mirrors > Home > MPE Home > Th. List > Mathboxes > suprltrp | Structured version Visualization version GIF version |
Description: The supremum of a nonempty bounded set of reals can be approximated from below by elements of the set. (Contributed by Glauco Siliprandi, 17-Aug-2020.) |
Ref | Expression |
---|---|
suprltrp.a | ⊢ (𝜑 → 𝐴 ⊆ ℝ) |
suprltrp.n0 | ⊢ (𝜑 → 𝐴 ≠ ∅) |
suprltrp.bnd | ⊢ (𝜑 → ∃𝑥 ∈ ℝ ∀𝑦 ∈ 𝐴 𝑦 ≤ 𝑥) |
suprltrp.x | ⊢ (𝜑 → 𝑋 ∈ ℝ+) |
Ref | Expression |
---|---|
suprltrp | ⊢ (𝜑 → ∃𝑧 ∈ 𝐴 (sup(𝐴, ℝ, < ) − 𝑋) < 𝑧) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | suprltrp.a | . . . 4 ⊢ (𝜑 → 𝐴 ⊆ ℝ) | |
2 | suprltrp.n0 | . . . 4 ⊢ (𝜑 → 𝐴 ≠ ∅) | |
3 | suprltrp.bnd | . . . 4 ⊢ (𝜑 → ∃𝑥 ∈ ℝ ∀𝑦 ∈ 𝐴 𝑦 ≤ 𝑥) | |
4 | suprcl 11587 | . . . 4 ⊢ ((𝐴 ⊆ ℝ ∧ 𝐴 ≠ ∅ ∧ ∃𝑥 ∈ ℝ ∀𝑦 ∈ 𝐴 𝑦 ≤ 𝑥) → sup(𝐴, ℝ, < ) ∈ ℝ) | |
5 | 1, 2, 3, 4 | syl3anc 1367 | . . 3 ⊢ (𝜑 → sup(𝐴, ℝ, < ) ∈ ℝ) |
6 | suprltrp.x | . . 3 ⊢ (𝜑 → 𝑋 ∈ ℝ+) | |
7 | 5, 6 | ltsubrpd 12450 | . 2 ⊢ (𝜑 → (sup(𝐴, ℝ, < ) − 𝑋) < sup(𝐴, ℝ, < )) |
8 | 6 | rpred 12418 | . . . 4 ⊢ (𝜑 → 𝑋 ∈ ℝ) |
9 | 5, 8 | resubcld 11054 | . . 3 ⊢ (𝜑 → (sup(𝐴, ℝ, < ) − 𝑋) ∈ ℝ) |
10 | suprlub 11591 | . . 3 ⊢ (((𝐴 ⊆ ℝ ∧ 𝐴 ≠ ∅ ∧ ∃𝑥 ∈ ℝ ∀𝑦 ∈ 𝐴 𝑦 ≤ 𝑥) ∧ (sup(𝐴, ℝ, < ) − 𝑋) ∈ ℝ) → ((sup(𝐴, ℝ, < ) − 𝑋) < sup(𝐴, ℝ, < ) ↔ ∃𝑧 ∈ 𝐴 (sup(𝐴, ℝ, < ) − 𝑋) < 𝑧)) | |
11 | 1, 2, 3, 9, 10 | syl31anc 1369 | . 2 ⊢ (𝜑 → ((sup(𝐴, ℝ, < ) − 𝑋) < sup(𝐴, ℝ, < ) ↔ ∃𝑧 ∈ 𝐴 (sup(𝐴, ℝ, < ) − 𝑋) < 𝑧)) |
12 | 7, 11 | mpbid 234 | 1 ⊢ (𝜑 → ∃𝑧 ∈ 𝐴 (sup(𝐴, ℝ, < ) − 𝑋) < 𝑧) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 208 ∈ wcel 2114 ≠ wne 3016 ∀wral 3138 ∃wrex 3139 ⊆ wss 3924 ∅c0 4279 class class class wbr 5052 (class class class)co 7142 supcsup 8890 ℝcr 10522 < clt 10661 ≤ cle 10662 − cmin 10856 ℝ+crp 12376 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2793 ax-sep 5189 ax-nul 5196 ax-pow 5252 ax-pr 5316 ax-un 7447 ax-resscn 10580 ax-1cn 10581 ax-icn 10582 ax-addcl 10583 ax-addrcl 10584 ax-mulcl 10585 ax-mulrcl 10586 ax-mulcom 10587 ax-addass 10588 ax-mulass 10589 ax-distr 10590 ax-i2m1 10591 ax-1ne0 10592 ax-1rid 10593 ax-rnegex 10594 ax-rrecex 10595 ax-cnre 10596 ax-pre-lttri 10597 ax-pre-lttrn 10598 ax-pre-ltadd 10599 ax-pre-mulgt0 10600 ax-pre-sup 10601 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1084 df-3an 1085 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-mo 2622 df-eu 2654 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-ne 3017 df-nel 3124 df-ral 3143 df-rex 3144 df-reu 3145 df-rmo 3146 df-rab 3147 df-v 3488 df-sbc 3764 df-csb 3872 df-dif 3927 df-un 3929 df-in 3931 df-ss 3940 df-nul 4280 df-if 4454 df-pw 4527 df-sn 4554 df-pr 4556 df-op 4560 df-uni 4825 df-br 5053 df-opab 5115 df-mpt 5133 df-id 5446 df-po 5460 df-so 5461 df-xp 5547 df-rel 5548 df-cnv 5549 df-co 5550 df-dm 5551 df-rn 5552 df-res 5553 df-ima 5554 df-iota 6300 df-fun 6343 df-fn 6344 df-f 6345 df-f1 6346 df-fo 6347 df-f1o 6348 df-fv 6349 df-riota 7100 df-ov 7145 df-oprab 7146 df-mpo 7147 df-er 8275 df-en 8496 df-dom 8497 df-sdom 8498 df-sup 8892 df-pnf 10663 df-mnf 10664 df-xr 10665 df-ltxr 10666 df-le 10667 df-sub 10858 df-neg 10859 df-rp 12377 |
This theorem is referenced by: sge0ltfirp 42772 |
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