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| Mirrors > Home > MPE Home > Th. List > Mathboxes > infxrlesupxr | Structured version Visualization version GIF version | ||
| Description: The supremum of a nonempty set is greater than or equal to the infimum. The second condition is needed, see supxrltinfxr 45574. (Contributed by Glauco Siliprandi, 2-Jan-2022.) |
| Ref | Expression |
|---|---|
| infxrlesupxr.1 | ⊢ (𝜑 → 𝐴 ⊆ ℝ*) |
| infxrlesupxr.2 | ⊢ (𝜑 → 𝐴 ≠ ∅) |
| Ref | Expression |
|---|---|
| infxrlesupxr | ⊢ (𝜑 → inf(𝐴, ℝ*, < ) ≤ sup(𝐴, ℝ*, < )) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | infxrlesupxr.2 | . . 3 ⊢ (𝜑 → 𝐴 ≠ ∅) | |
| 2 | n0 4302 | . . . 4 ⊢ (𝐴 ≠ ∅ ↔ ∃𝑥 𝑥 ∈ 𝐴) | |
| 3 | 2 | biimpi 216 | . . 3 ⊢ (𝐴 ≠ ∅ → ∃𝑥 𝑥 ∈ 𝐴) |
| 4 | 1, 3 | syl 17 | . 2 ⊢ (𝜑 → ∃𝑥 𝑥 ∈ 𝐴) |
| 5 | infxrlesupxr.1 | . . . . . . 7 ⊢ (𝜑 → 𝐴 ⊆ ℝ*) | |
| 6 | 5 | infxrcld 45514 | . . . . . 6 ⊢ (𝜑 → inf(𝐴, ℝ*, < ) ∈ ℝ*) |
| 7 | 6 | adantr 480 | . . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → inf(𝐴, ℝ*, < ) ∈ ℝ*) |
| 8 | 5 | sselda 3930 | . . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝑥 ∈ ℝ*) |
| 9 | 5 | supxrcld 45231 | . . . . . 6 ⊢ (𝜑 → sup(𝐴, ℝ*, < ) ∈ ℝ*) |
| 10 | 9 | adantr 480 | . . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → sup(𝐴, ℝ*, < ) ∈ ℝ*) |
| 11 | 5 | adantr 480 | . . . . . 6 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝐴 ⊆ ℝ*) |
| 12 | simpr 484 | . . . . . 6 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝑥 ∈ 𝐴) | |
| 13 | infxrlb 13238 | . . . . . 6 ⊢ ((𝐴 ⊆ ℝ* ∧ 𝑥 ∈ 𝐴) → inf(𝐴, ℝ*, < ) ≤ 𝑥) | |
| 14 | 11, 12, 13 | syl2anc 584 | . . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → inf(𝐴, ℝ*, < ) ≤ 𝑥) |
| 15 | eqid 2733 | . . . . . 6 ⊢ sup(𝐴, ℝ*, < ) = sup(𝐴, ℝ*, < ) | |
| 16 | 11, 12, 15 | supxrubd 45237 | . . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝑥 ≤ sup(𝐴, ℝ*, < )) |
| 17 | 7, 8, 10, 14, 16 | xrletrd 13065 | . . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → inf(𝐴, ℝ*, < ) ≤ sup(𝐴, ℝ*, < )) |
| 18 | 17 | ex 412 | . . 3 ⊢ (𝜑 → (𝑥 ∈ 𝐴 → inf(𝐴, ℝ*, < ) ≤ sup(𝐴, ℝ*, < ))) |
| 19 | 18 | exlimdv 1934 | . 2 ⊢ (𝜑 → (∃𝑥 𝑥 ∈ 𝐴 → inf(𝐴, ℝ*, < ) ≤ sup(𝐴, ℝ*, < ))) |
| 20 | 4, 19 | mpd 15 | 1 ⊢ (𝜑 → inf(𝐴, ℝ*, < ) ≤ sup(𝐴, ℝ*, < )) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 395 ∃wex 1780 ∈ wcel 2113 ≠ wne 2929 ⊆ wss 3898 ∅c0 4282 class class class wbr 5095 supcsup 9333 infcinf 9334 ℝ*cxr 11154 < clt 11155 ≤ cle 11156 |
| 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 1968 ax-7 2009 ax-8 2115 ax-9 2123 ax-10 2146 ax-11 2162 ax-12 2182 ax-ext 2705 ax-sep 5238 ax-nul 5248 ax-pow 5307 ax-pr 5374 ax-un 7676 ax-cnex 11071 ax-resscn 11072 ax-1cn 11073 ax-icn 11074 ax-addcl 11075 ax-addrcl 11076 ax-mulcl 11077 ax-mulrcl 11078 ax-mulcom 11079 ax-addass 11080 ax-mulass 11081 ax-distr 11082 ax-i2m1 11083 ax-1ne0 11084 ax-1rid 11085 ax-rnegex 11086 ax-rrecex 11087 ax-cnre 11088 ax-pre-lttri 11089 ax-pre-lttrn 11090 ax-pre-ltadd 11091 ax-pre-mulgt0 11092 ax-pre-sup 11093 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1544 df-fal 1554 df-ex 1781 df-nf 1785 df-sb 2068 df-mo 2537 df-eu 2566 df-clab 2712 df-cleq 2725 df-clel 2808 df-nfc 2882 df-ne 2930 df-nel 3034 df-ral 3049 df-rex 3058 df-rmo 3347 df-reu 3348 df-rab 3397 df-v 3439 df-sbc 3738 df-csb 3847 df-dif 3901 df-un 3903 df-in 3905 df-ss 3915 df-nul 4283 df-if 4477 df-pw 4553 df-sn 4578 df-pr 4580 df-op 4584 df-uni 4861 df-br 5096 df-opab 5158 df-mpt 5177 df-id 5516 df-po 5529 df-so 5530 df-xp 5627 df-rel 5628 df-cnv 5629 df-co 5630 df-dm 5631 df-rn 5632 df-res 5633 df-ima 5634 df-iota 6444 df-fun 6490 df-fn 6491 df-f 6492 df-f1 6493 df-fo 6494 df-f1o 6495 df-fv 6496 df-riota 7311 df-ov 7357 df-oprab 7358 df-mpo 7359 df-er 8630 df-en 8878 df-dom 8879 df-sdom 8880 df-sup 9335 df-inf 9336 df-pnf 11157 df-mnf 11158 df-xr 11159 df-ltxr 11160 df-le 11161 df-sub 11355 df-neg 11356 |
| This theorem is referenced by: liminflelimsuplem 45900 |
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