| Mathbox for Glauco Siliprandi |
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| Mirrors > Home > MPE Home > Th. List > Mathboxes > infleinf2 | Structured version Visualization version GIF version | ||
| Description: If any element in 𝐵 is greater than or equal to an element in 𝐴, then the infimum of 𝐴 is less than or equal to the infimum of 𝐵. (Contributed by Glauco Siliprandi, 23-Oct-2021.) |
| Ref | Expression |
|---|---|
| infleinf2.x | ⊢ Ⅎ𝑥𝜑 |
| infleinf2.p | ⊢ Ⅎ𝑦𝜑 |
| infleinf2.a | ⊢ (𝜑 → 𝐴 ⊆ ℝ*) |
| infleinf2.b | ⊢ (𝜑 → 𝐵 ⊆ ℝ*) |
| infleinf2.y | ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐵) → ∃𝑦 ∈ 𝐴 𝑦 ≤ 𝑥) |
| Ref | Expression |
|---|---|
| infleinf2 | ⊢ (𝜑 → inf(𝐴, ℝ*, < ) ≤ inf(𝐵, ℝ*, < )) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | infleinf2.x | . . 3 ⊢ Ⅎ𝑥𝜑 | |
| 2 | infleinf2.y | . . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐵) → ∃𝑦 ∈ 𝐴 𝑦 ≤ 𝑥) | |
| 3 | infleinf2.p | . . . . . 6 ⊢ Ⅎ𝑦𝜑 | |
| 4 | nfv 1921 | . . . . . 6 ⊢ Ⅎ𝑦 𝑥 ∈ 𝐵 | |
| 5 | 3, 4 | nfan 1906 | . . . . 5 ⊢ Ⅎ𝑦(𝜑 ∧ 𝑥 ∈ 𝐵) |
| 6 | nfv 1921 | . . . . 5 ⊢ Ⅎ𝑦inf(𝐴, ℝ*, < ) ≤ 𝑥 | |
| 7 | infleinf2.a | . . . . . . . . . 10 ⊢ (𝜑 → 𝐴 ⊆ ℝ*) | |
| 8 | 7 | infxrcld 45833 | . . . . . . . . 9 ⊢ (𝜑 → inf(𝐴, ℝ*, < ) ∈ ℝ*) |
| 9 | 8 | 3ad2ant1 1139 | . . . . . . . 8 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐴 ∧ 𝑦 ≤ 𝑥) → inf(𝐴, ℝ*, < ) ∈ ℝ*) |
| 10 | 9 | 3adant1r 1184 | . . . . . . 7 ⊢ (((𝜑 ∧ 𝑥 ∈ 𝐵) ∧ 𝑦 ∈ 𝐴 ∧ 𝑦 ≤ 𝑥) → inf(𝐴, ℝ*, < ) ∈ ℝ*) |
| 11 | 7 | sselda 3915 | . . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐴) → 𝑦 ∈ ℝ*) |
| 12 | 11 | 3adant3 1138 | . . . . . . . 8 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐴 ∧ 𝑦 ≤ 𝑥) → 𝑦 ∈ ℝ*) |
| 13 | 12 | 3adant1r 1184 | . . . . . . 7 ⊢ (((𝜑 ∧ 𝑥 ∈ 𝐵) ∧ 𝑦 ∈ 𝐴 ∧ 𝑦 ≤ 𝑥) → 𝑦 ∈ ℝ*) |
| 14 | infleinf2.b | . . . . . . . . 9 ⊢ (𝜑 → 𝐵 ⊆ ℝ*) | |
| 15 | 14 | sselda 3915 | . . . . . . . 8 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐵) → 𝑥 ∈ ℝ*) |
| 16 | 15 | 3ad2ant1 1139 | . . . . . . 7 ⊢ (((𝜑 ∧ 𝑥 ∈ 𝐵) ∧ 𝑦 ∈ 𝐴 ∧ 𝑦 ≤ 𝑥) → 𝑥 ∈ ℝ*) |
| 17 | 7 | adantr 481 | . . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐴) → 𝐴 ⊆ ℝ*) |
| 18 | simpr 485 | . . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐴) → 𝑦 ∈ 𝐴) | |
| 19 | infxrlb 13278 | . . . . . . . . . 10 ⊢ ((𝐴 ⊆ ℝ* ∧ 𝑦 ∈ 𝐴) → inf(𝐴, ℝ*, < ) ≤ 𝑦) | |
| 20 | 17, 18, 19 | syl2anc 590 | . . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐴) → inf(𝐴, ℝ*, < ) ≤ 𝑦) |
| 21 | 20 | 3adant3 1138 | . . . . . . . 8 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐴 ∧ 𝑦 ≤ 𝑥) → inf(𝐴, ℝ*, < ) ≤ 𝑦) |
| 22 | 21 | 3adant1r 1184 | . . . . . . 7 ⊢ (((𝜑 ∧ 𝑥 ∈ 𝐵) ∧ 𝑦 ∈ 𝐴 ∧ 𝑦 ≤ 𝑥) → inf(𝐴, ℝ*, < ) ≤ 𝑦) |
| 23 | simp3 1144 | . . . . . . 7 ⊢ (((𝜑 ∧ 𝑥 ∈ 𝐵) ∧ 𝑦 ∈ 𝐴 ∧ 𝑦 ≤ 𝑥) → 𝑦 ≤ 𝑥) | |
| 24 | 10, 13, 16, 22, 23 | xrletrd 13104 | . . . . . 6 ⊢ (((𝜑 ∧ 𝑥 ∈ 𝐵) ∧ 𝑦 ∈ 𝐴 ∧ 𝑦 ≤ 𝑥) → inf(𝐴, ℝ*, < ) ≤ 𝑥) |
| 25 | 24 | 3exp 1125 | . . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐵) → (𝑦 ∈ 𝐴 → (𝑦 ≤ 𝑥 → inf(𝐴, ℝ*, < ) ≤ 𝑥))) |
| 26 | 5, 6, 25 | rexlimd 3246 | . . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐵) → (∃𝑦 ∈ 𝐴 𝑦 ≤ 𝑥 → inf(𝐴, ℝ*, < ) ≤ 𝑥)) |
| 27 | 2, 26 | mpd 15 | . . 3 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐵) → inf(𝐴, ℝ*, < ) ≤ 𝑥) |
| 28 | 1, 27 | ralrimia 3238 | . 2 ⊢ (𝜑 → ∀𝑥 ∈ 𝐵 inf(𝐴, ℝ*, < ) ≤ 𝑥) |
| 29 | infxrgelb 13279 | . . 3 ⊢ ((𝐵 ⊆ ℝ* ∧ inf(𝐴, ℝ*, < ) ∈ ℝ*) → (inf(𝐴, ℝ*, < ) ≤ inf(𝐵, ℝ*, < ) ↔ ∀𝑥 ∈ 𝐵 inf(𝐴, ℝ*, < ) ≤ 𝑥)) | |
| 30 | 14, 8, 29 | syl2anc 590 | . 2 ⊢ (𝜑 → (inf(𝐴, ℝ*, < ) ≤ inf(𝐵, ℝ*, < ) ↔ ∀𝑥 ∈ 𝐵 inf(𝐴, ℝ*, < ) ≤ 𝑥)) |
| 31 | 28, 30 | mpbird 258 | 1 ⊢ (𝜑 → inf(𝐴, ℝ*, < ) ≤ inf(𝐵, ℝ*, < )) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ↔ wb 207 ∧ wa 396 ∧ w3a 1092 Ⅎwnf 1790 ∈ wcel 2119 ∀wral 3053 ∃wrex 3063 ⊆ wss 3883 class class class wbr 5072 infcinf 9344 ℝ*cxr 11169 < clt 11170 ≤ cle 11171 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1802 ax-4 1816 ax-5 1917 ax-6 1974 ax-7 2015 ax-8 2121 ax-9 2129 ax-10 2152 ax-11 2168 ax-12 2189 ax-ext 2711 ax-sep 5218 ax-nul 5228 ax-pow 5294 ax-pr 5362 ax-un 7678 ax-cnex 11085 ax-resscn 11086 ax-1cn 11087 ax-icn 11088 ax-addcl 11089 ax-addrcl 11090 ax-mulcl 11091 ax-mulrcl 11092 ax-mulcom 11093 ax-addass 11094 ax-mulass 11095 ax-distr 11096 ax-i2m1 11097 ax-1ne0 11098 ax-1rid 11099 ax-rnegex 11100 ax-rrecex 11101 ax-cnre 11102 ax-pre-lttri 11103 ax-pre-lttrn 11104 ax-pre-ltadd 11105 ax-pre-mulgt0 11106 ax-pre-sup 11107 |
| This theorem depends on definitions: df-bi 208 df-an 397 df-or 854 df-3or 1093 df-3an 1094 df-tru 1550 df-fal 1560 df-ex 1787 df-nf 1791 df-sb 2074 df-mo 2543 df-eu 2573 df-clab 2718 df-cleq 2731 df-clel 2814 df-nfc 2888 df-ne 2935 df-nel 3039 df-ral 3054 df-rex 3064 df-rmo 3344 df-reu 3345 df-rab 3392 df-v 3433 df-sbc 3724 df-csb 3832 df-dif 3886 df-un 3888 df-in 3890 df-ss 3900 df-nul 4262 df-if 4455 df-pw 4531 df-sn 4556 df-pr 4558 df-op 4562 df-uni 4839 df-br 5073 df-opab 5135 df-mpt 5154 df-id 5513 df-po 5526 df-so 5527 df-xp 5624 df-rel 5625 df-cnv 5626 df-co 5627 df-dm 5628 df-rn 5629 df-res 5630 df-ima 5631 df-iota 6441 df-fun 6487 df-fn 6488 df-f 6489 df-f1 6490 df-fo 6491 df-f1o 6492 df-fv 6493 df-riota 7313 df-ov 7359 df-oprab 7360 df-mpo 7361 df-er 8633 df-en 8884 df-dom 8885 df-sdom 8886 df-sup 9345 df-inf 9346 df-pnf 11172 df-mnf 11173 df-xr 11174 df-ltxr 11175 df-le 11176 df-sub 11370 df-neg 11371 |
| This theorem is referenced by: infrnmptle 45866 infxrpnf 45889 |
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