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| Mirrors > Home > MPE Home > Th. List > Mathboxes > taupilemrplb | Structured version Visualization version GIF version | ||
| Description: A set of positive reals has (in the reals) a lower bound. (Contributed by Jim Kingdon, 19-Feb-2019.) |
| Ref | Expression |
|---|---|
| taupilemrplb | ⊢ ∃𝑥 ∈ ℝ ∀𝑦 ∈ (ℝ+ ∩ 𝐴)𝑥 ≤ 𝑦 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 0re 11134 | . 2 ⊢ 0 ∈ ℝ | |
| 2 | inss1 4189 | . . . . 5 ⊢ (ℝ+ ∩ 𝐴) ⊆ ℝ+ | |
| 3 | 2 | sseli 3929 | . . . 4 ⊢ (𝑦 ∈ (ℝ+ ∩ 𝐴) → 𝑦 ∈ ℝ+) |
| 4 | 3 | rpge0d 12953 | . . 3 ⊢ (𝑦 ∈ (ℝ+ ∩ 𝐴) → 0 ≤ 𝑦) |
| 5 | 4 | rgen 3053 | . 2 ⊢ ∀𝑦 ∈ (ℝ+ ∩ 𝐴)0 ≤ 𝑦 |
| 6 | breq1 5101 | . . . 4 ⊢ (𝑥 = 0 → (𝑥 ≤ 𝑦 ↔ 0 ≤ 𝑦)) | |
| 7 | 6 | ralbidv 3159 | . . 3 ⊢ (𝑥 = 0 → (∀𝑦 ∈ (ℝ+ ∩ 𝐴)𝑥 ≤ 𝑦 ↔ ∀𝑦 ∈ (ℝ+ ∩ 𝐴)0 ≤ 𝑦)) |
| 8 | 7 | rspcev 3576 | . 2 ⊢ ((0 ∈ ℝ ∧ ∀𝑦 ∈ (ℝ+ ∩ 𝐴)0 ≤ 𝑦) → ∃𝑥 ∈ ℝ ∀𝑦 ∈ (ℝ+ ∩ 𝐴)𝑥 ≤ 𝑦) |
| 9 | 1, 5, 8 | mp2an 692 | 1 ⊢ ∃𝑥 ∈ ℝ ∀𝑦 ∈ (ℝ+ ∩ 𝐴)𝑥 ≤ 𝑦 |
| Colors of variables: wff setvar class |
| Syntax hints: = wceq 1541 ∈ wcel 2113 ∀wral 3051 ∃wrex 3060 ∩ cin 3900 class class class wbr 5098 ℝcr 11025 0cc0 11026 ≤ cle 11167 ℝ+crp 12905 |
| 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 2184 ax-ext 2708 ax-sep 5241 ax-nul 5251 ax-pow 5310 ax-pr 5377 ax-un 7680 ax-resscn 11083 ax-1cn 11084 ax-addrcl 11087 ax-rnegex 11097 ax-cnre 11099 ax-pre-lttri 11100 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3an 1088 df-tru 1544 df-fal 1554 df-ex 1781 df-nf 1785 df-sb 2068 df-mo 2539 df-eu 2569 df-clab 2715 df-cleq 2728 df-clel 2811 df-nfc 2885 df-ne 2933 df-nel 3037 df-ral 3052 df-rex 3061 df-rab 3400 df-v 3442 df-sbc 3741 df-csb 3850 df-dif 3904 df-un 3906 df-in 3908 df-ss 3918 df-nul 4286 df-if 4480 df-pw 4556 df-sn 4581 df-pr 4583 df-op 4587 df-uni 4864 df-br 5099 df-opab 5161 df-mpt 5180 df-id 5519 df-xp 5630 df-rel 5631 df-cnv 5632 df-co 5633 df-dm 5634 df-rn 5635 df-res 5636 df-ima 5637 df-iota 6448 df-fun 6494 df-fn 6495 df-f 6496 df-f1 6497 df-fo 6498 df-f1o 6499 df-fv 6500 df-er 8635 df-en 8884 df-dom 8885 df-sdom 8886 df-pnf 11168 df-mnf 11169 df-xr 11170 df-ltxr 11171 df-le 11172 df-rp 12906 |
| This theorem is referenced by: taupilem2 37527 taupi 37528 |
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