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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 46196. (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 4307 | . . . 4 ⊢ (𝐴 ≠ ∅ ↔ ∃𝑥 𝑥 ∈ 𝐴) | |
| 3 | 2 | biimpi 219 | . . 3 ⊢ (𝐴 ≠ ∅ → ∃𝑥 𝑥 ∈ 𝐴) |
| 4 | 1, 3 | syl 18 | . 2 ⊢ (𝜑 → ∃𝑥 𝑥 ∈ 𝐴) |
| 5 | infxrlesupxr.1 | . . . . . . 7 ⊢ (𝜑 → 𝐴 ⊆ ℝ*) | |
| 6 | 5 | infxrcld 46137 | . . . . . 6 ⊢ (𝜑 → inf(𝐴, ℝ*, < ) ∈ ℝ*) |
| 7 | 6 | adantr 486 | . . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → inf(𝐴, ℝ*, < ) ∈ ℝ*) |
| 8 | 5 | sselda 3938 | . . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝑥 ∈ ℝ*) |
| 9 | 5 | supxrcld 45858 | . . . . . 6 ⊢ (𝜑 → sup(𝐴, ℝ*, < ) ∈ ℝ*) |
| 10 | 9 | adantr 486 | . . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → sup(𝐴, ℝ*, < ) ∈ ℝ*) |
| 11 | 5 | adantr 486 | . . . . . 6 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝐴 ⊆ ℝ*) |
| 12 | simpr 490 | . . . . . 6 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝑥 ∈ 𝐴) | |
| 13 | infxrlb 13372 | . . . . . 6 ⊢ ((𝐴 ⊆ ℝ* ∧ 𝑥 ∈ 𝐴) → inf(𝐴, ℝ*, < ) ≤ 𝑥) | |
| 14 | 11, 12, 13 | syl2anc 596 | . . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → inf(𝐴, ℝ*, < ) ≤ 𝑥) |
| 15 | eqid 2765 | . . . . . 6 ⊢ sup(𝐴, ℝ*, < ) = sup(𝐴, ℝ*, < ) | |
| 16 | 11, 12, 15 | supxrubd 45864 | . . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝑥 ≤ sup(𝐴, ℝ*, < )) |
| 17 | 7, 8, 10, 14, 16 | xrletrd 13198 | . . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → inf(𝐴, ℝ*, < ) ≤ sup(𝐴, ℝ*, < )) |
| 18 | 17 | ex 418 | . . 3 ⊢ (𝜑 → (𝑥 ∈ 𝐴 → inf(𝐴, ℝ*, < ) ≤ sup(𝐴, ℝ*, < ))) |
| 19 | 18 | exlimdv 1966 | . 2 ⊢ (𝜑 → (∃𝑥 𝑥 ∈ 𝐴 → inf(𝐴, ℝ*, < ) ≤ sup(𝐴, ℝ*, < ))) |
| 20 | 4, 19 | mpd 16 | 1 ⊢ (𝜑 → inf(𝐴, ℝ*, < ) ≤ sup(𝐴, ℝ*, < )) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ∧ wa 401 ∃wex 1812 ∈ wcel 2146 ≠ wne 2960 ⊆ wss 3906 ∅c0 4286 class class class wbr 5111 supcsup 9403 infcinf 9404 ℝ*cxr 11253 < clt 11254 ≤ cle 11255 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2148 ax-9 2156 ax-10 2179 ax-11 2195 ax-12 2216 ax-ext 2737 ax-sep 5259 ax-nul 5271 ax-pow 5338 ax-pr 5406 ax-un 7738 ax-cnex 11167 ax-resscn 11168 ax-1cn 11169 ax-icn 11170 ax-addcl 11171 ax-addrcl 11172 ax-mulcl 11173 ax-mulrcl 11174 ax-mulcom 11175 ax-addass 11176 ax-mulass 11177 ax-distr 11178 ax-i2m1 11179 ax-1ne0 11180 ax-1rid 11181 ax-rnegex 11182 ax-rrecex 11183 ax-cnre 11184 ax-pre-lttri 11185 ax-pre-lttrn 11186 ax-pre-ltadd 11187 ax-pre-mulgt0 11188 ax-pre-sup 11189 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 df-mo 2569 df-eu 2599 df-clab 2744 df-cleq 2757 df-clel 2840 df-nfc 2914 df-ne 2961 df-nel 3067 df-ral 3082 df-rex 3092 df-rmo 3371 df-reu 3372 df-rab 3419 df-v 3459 df-sbc 3747 df-csb 3855 df-dif 3909 df-un 3911 df-in 3913 df-ss 3923 df-nul 4287 df-if 4490 df-pw 4566 df-sn 4592 df-pr 4594 df-op 4598 df-uni 4875 df-br 5112 df-opab 5176 df-mpt 5195 df-id 5558 df-po 5571 df-so 5572 df-xp 5669 df-rel 5670 df-cnv 5671 df-co 5672 df-dm 5673 df-rn 5674 df-res 5675 df-ima 5676 df-iota 6496 df-fun 6542 df-fn 6543 df-f 6544 df-f1 6545 df-fo 6546 df-f1o 6547 df-fv 6548 df-riota 7373 df-ov 7419 df-oprab 7420 df-mpo 7421 df-er 8696 df-en 8946 df-dom 8947 df-sdom 8948 df-sup 9405 df-inf 9406 df-pnf 11256 df-mnf 11257 df-xr 11258 df-ltxr 11259 df-le 11260 df-sub 11454 df-neg 11455 |
| This theorem is used by: liminflelimsuplem 46522 |
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