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| Mirrors > Home > MPE Home > Th. List > eqlei | Structured version Visualization version GIF version | ||
| Description: Equality implies 'less than or equal to'. (Contributed by NM, 23-May-1999.) (Revised by Alexander van der Vekens, 20-Mar-2018.) |
| Ref | Expression |
|---|---|
| lt.1 | ⊢ 𝐴 ∈ ℝ |
| Ref | Expression |
|---|---|
| eqlei | ⊢ (𝐴 = 𝐵 → 𝐴 ≤ 𝐵) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | lt.1 | . . . 4 ⊢ 𝐴 ∈ ℝ | |
| 2 | eleq1a 2823 | . . . 4 ⊢ (𝐴 ∈ ℝ → (𝐵 = 𝐴 → 𝐵 ∈ ℝ)) | |
| 3 | 1, 2 | ax-mp 5 | . . 3 ⊢ (𝐵 = 𝐴 → 𝐵 ∈ ℝ) |
| 4 | 3 | eqcoms 2737 | . 2 ⊢ (𝐴 = 𝐵 → 𝐵 ∈ ℝ) |
| 5 | letri3 11235 | . . . 4 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝐴 = 𝐵 ↔ (𝐴 ≤ 𝐵 ∧ 𝐵 ≤ 𝐴))) | |
| 6 | 1, 5 | mpan 690 | . . 3 ⊢ (𝐵 ∈ ℝ → (𝐴 = 𝐵 ↔ (𝐴 ≤ 𝐵 ∧ 𝐵 ≤ 𝐴))) |
| 7 | simpl 482 | . . 3 ⊢ ((𝐴 ≤ 𝐵 ∧ 𝐵 ≤ 𝐴) → 𝐴 ≤ 𝐵) | |
| 8 | 6, 7 | biimtrdi 253 | . 2 ⊢ (𝐵 ∈ ℝ → (𝐴 = 𝐵 → 𝐴 ≤ 𝐵)) |
| 9 | 4, 8 | mpcom 38 | 1 ⊢ (𝐴 = 𝐵 → 𝐴 ≤ 𝐵) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ↔ wb 206 ∧ wa 395 = wceq 1540 ∈ wcel 2109 class class class wbr 5102 ℝcr 11043 ≤ cle 11185 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1967 ax-7 2008 ax-8 2111 ax-9 2119 ax-10 2142 ax-11 2158 ax-12 2178 ax-ext 2701 ax-sep 5246 ax-nul 5256 ax-pow 5315 ax-pr 5382 ax-un 7691 ax-resscn 11101 ax-pre-lttri 11118 ax-pre-lttrn 11119 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2066 df-mo 2533 df-eu 2562 df-clab 2708 df-cleq 2721 df-clel 2803 df-nfc 2878 df-ne 2926 df-nel 3030 df-ral 3045 df-rex 3054 df-rab 3403 df-v 3446 df-sbc 3751 df-csb 3860 df-dif 3914 df-un 3916 df-in 3918 df-ss 3928 df-nul 4293 df-if 4485 df-pw 4561 df-sn 4586 df-pr 4588 df-op 4592 df-uni 4868 df-br 5103 df-opab 5165 df-mpt 5184 df-id 5526 df-po 5539 df-so 5540 df-xp 5637 df-rel 5638 df-cnv 5639 df-co 5640 df-dm 5641 df-rn 5642 df-res 5643 df-ima 5644 df-iota 6452 df-fun 6501 df-fn 6502 df-f 6503 df-f1 6504 df-fo 6505 df-f1o 6506 df-fv 6507 df-er 8648 df-en 8896 df-dom 8897 df-sdom 8898 df-pnf 11186 df-mnf 11187 df-xr 11188 df-ltxr 11189 df-le 11190 |
| This theorem is referenced by: le2tri3i 11280 fldiv4lem1div2 13775 vdegp1bi 29441 |
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