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| Mirrors > Home > MPE Home > Th. List > Mathboxes > redivrec2d | Structured version Visualization version GIF version | ||
| Description: Relationship between division and reciprocal. (Contributed by SN, 9-Apr-2026.) |
| Ref | Expression |
|---|---|
| redivrec2d.a | ⊢ (𝜑 → 𝐴 ∈ ℝ) |
| redivrec2d.b | ⊢ (𝜑 → 𝐵 ∈ ℝ) |
| redivrec2d.z | ⊢ (𝜑 → 𝐵 ≠ 0) |
| Ref | Expression |
|---|---|
| redivrec2d | ⊢ (𝜑 → (𝐴 /ℝ 𝐵) = ((1 /ℝ 𝐵) · 𝐴)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | redivrec2d.b | . . . . 5 ⊢ (𝜑 → 𝐵 ∈ ℝ) | |
| 2 | redivrec2d.z | . . . . 5 ⊢ (𝜑 → 𝐵 ≠ 0) | |
| 3 | 1, 2 | rerecidd 43476 | . . . 4 ⊢ (𝜑 → (𝐵 · (1 /ℝ 𝐵)) = 1) |
| 4 | 3 | oveq1d 7427 | . . 3 ⊢ (𝜑 → ((𝐵 · (1 /ℝ 𝐵)) · 𝐴) = (1 · 𝐴)) |
| 5 | 1 | recnd 11318 | . . . 4 ⊢ (𝜑 → 𝐵 ∈ ℂ) |
| 6 | 1, 2 | sn-rereccld 43474 | . . . . 5 ⊢ (𝜑 → (1 /ℝ 𝐵) ∈ ℝ) |
| 7 | 6 | recnd 11318 | . . . 4 ⊢ (𝜑 → (1 /ℝ 𝐵) ∈ ℂ) |
| 8 | redivrec2d.a | . . . . 5 ⊢ (𝜑 → 𝐴 ∈ ℝ) | |
| 9 | 8 | recnd 11318 | . . . 4 ⊢ (𝜑 → 𝐴 ∈ ℂ) |
| 10 | 5, 7, 9 | mulassd 11313 | . . 3 ⊢ (𝜑 → ((𝐵 · (1 /ℝ 𝐵)) · 𝐴) = (𝐵 · ((1 /ℝ 𝐵) · 𝐴))) |
| 11 | remullid 43453 | . . . 4 ⊢ (𝐴 ∈ ℝ → (1 · 𝐴) = 𝐴) | |
| 12 | 8, 11 | syl 18 | . . 3 ⊢ (𝜑 → (1 · 𝐴) = 𝐴) |
| 13 | 4, 10, 12 | 3eqtr3d 2804 | . 2 ⊢ (𝜑 → (𝐵 · ((1 /ℝ 𝐵) · 𝐴)) = 𝐴) |
| 14 | 6, 8 | remulcld 11320 | . . 3 ⊢ (𝜑 → ((1 /ℝ 𝐵) · 𝐴) ∈ ℝ) |
| 15 | 8, 14, 1, 2 | redivmuld 43464 | . 2 ⊢ (𝜑 → ((𝐴 /ℝ 𝐵) = ((1 /ℝ 𝐵) · 𝐴) ↔ (𝐵 · ((1 /ℝ 𝐵) · 𝐴)) = 𝐴)) |
| 16 | 13, 15 | mpbird 260 | 1 ⊢ (𝜑 → (𝐴 /ℝ 𝐵) = ((1 /ℝ 𝐵) · 𝐴)) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 = wceq 1570 ∈ wcel 2145 ≠ wne 2956 (class class class)co 7412 ℝcr 11180 0cc0 11181 1c1 11182 · cmul 11186 /ℝ crediv 43459 |
| 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 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2213 ax-ext 2733 ax-sep 5249 ax-nul 5260 ax-pow 5327 ax-pr 5391 ax-un 7740 ax-resscn 11238 ax-1cn 11239 ax-icn 11240 ax-addcl 11241 ax-addrcl 11242 ax-mulcl 11243 ax-mulrcl 11244 ax-addass 11246 ax-mulass 11247 ax-distr 11248 ax-i2m1 11249 ax-1ne0 11250 ax-1rid 11251 ax-rnegex 11252 ax-rrecex 11253 ax-cnre 11254 ax-pre-lttri 11255 ax-pre-lttrn 11256 ax-pre-ltadd 11257 |
| 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 2565 df-eu 2595 df-clab 2740 df-cleq 2753 df-clel 2836 df-nfc 2910 df-ne 2957 df-nel 3063 df-ral 3078 df-rex 3088 df-rmo 3366 df-reu 3367 df-rab 3414 df-v 3453 df-sbc 3740 df-csb 3848 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-nul 4280 df-if 4483 df-pw 4559 df-sn 4585 df-pr 4587 df-op 4591 df-uni 4868 df-br 5104 df-opab 5168 df-mpt 5187 df-id 5546 df-po 5559 df-so 5560 df-xp 5657 df-rel 5658 df-cnv 5659 df-co 5660 df-dm 5661 df-rn 5662 df-res 5663 df-ima 5664 df-iota 6487 df-fun 6533 df-fn 6534 df-f 6535 df-f1 6536 df-fo 6537 df-f1o 6538 df-fv 6539 df-riota 7369 df-ov 7415 df-oprab 7416 df-mpo 7417 df-er 8701 df-en 8958 df-dom 8959 df-sdom 8960 df-pnf 11326 df-mnf 11327 df-ltxr 11329 df-2 12386 df-3 12387 df-resub 43385 df-rediv 43460 |
| This theorem is used by: rediv23d 43480 |
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