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| Mirrors > Home > MPE Home > Th. List > subrecd | Structured version Visualization version GIF version | ||
| Description: Subtraction of reciprocals. (Contributed by Scott Fenton, 9-Jan-2017.) |
| Ref | Expression |
|---|---|
| subrecd.1 | ⊢ (𝜑 → 𝐴 ∈ ℂ) |
| subrecd.2 | ⊢ (𝜑 → 𝐵 ∈ ℂ) |
| subrecd.3 | ⊢ (𝜑 → 𝐴 ≠ 0) |
| subrecd.4 | ⊢ (𝜑 → 𝐵 ≠ 0) |
| Ref | Expression |
|---|---|
| subrecd | ⊢ (𝜑 → ((1 / 𝐴) − (1 / 𝐵)) = ((𝐵 − 𝐴) / (𝐴 · 𝐵))) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 1cnd 11228 | . . 3 ⊢ (𝜑 → 1 ∈ ℂ) | |
| 2 | subrecd.1 | . . 3 ⊢ (𝜑 → 𝐴 ∈ ℂ) | |
| 3 | subrecd.2 | . . 3 ⊢ (𝜑 → 𝐵 ∈ ℂ) | |
| 4 | subrecd.3 | . . 3 ⊢ (𝜑 → 𝐴 ≠ 0) | |
| 5 | subrecd.4 | . . 3 ⊢ (𝜑 → 𝐵 ≠ 0) | |
| 6 | 1, 2, 1, 3, 4, 5 | divsubdivd 12060 | . 2 ⊢ (𝜑 → ((1 / 𝐴) − (1 / 𝐵)) = (((1 · 𝐵) − (1 · 𝐴)) / (𝐴 · 𝐵))) |
| 7 | 3 | mullidd 11251 | . . . 4 ⊢ (𝜑 → (1 · 𝐵) = 𝐵) |
| 8 | 2 | mullidd 11251 | . . . 4 ⊢ (𝜑 → (1 · 𝐴) = 𝐴) |
| 9 | 7, 8 | oveq12d 7421 | . . 3 ⊢ (𝜑 → ((1 · 𝐵) − (1 · 𝐴)) = (𝐵 − 𝐴)) |
| 10 | 9 | oveq1d 7418 | . 2 ⊢ (𝜑 → (((1 · 𝐵) − (1 · 𝐴)) / (𝐴 · 𝐵)) = ((𝐵 − 𝐴) / (𝐴 · 𝐵))) |
| 11 | 6, 10 | eqtrd 2770 | 1 ⊢ (𝜑 → ((1 / 𝐴) − (1 / 𝐵)) = ((𝐵 − 𝐴) / (𝐴 · 𝐵))) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 = wceq 1540 ∈ wcel 2108 ≠ wne 2932 (class class class)co 7403 ℂcc 11125 0cc0 11127 1c1 11128 · cmul 11132 − cmin 11464 / cdiv 11892 |
| 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 2007 ax-8 2110 ax-9 2118 ax-10 2141 ax-11 2157 ax-12 2177 ax-ext 2707 ax-sep 5266 ax-nul 5276 ax-pow 5335 ax-pr 5402 ax-un 7727 ax-resscn 11184 ax-1cn 11185 ax-icn 11186 ax-addcl 11187 ax-addrcl 11188 ax-mulcl 11189 ax-mulrcl 11190 ax-mulcom 11191 ax-addass 11192 ax-mulass 11193 ax-distr 11194 ax-i2m1 11195 ax-1ne0 11196 ax-1rid 11197 ax-rnegex 11198 ax-rrecex 11199 ax-cnre 11200 ax-pre-lttri 11201 ax-pre-lttrn 11202 ax-pre-ltadd 11203 ax-pre-mulgt0 11204 |
| 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 2065 df-mo 2539 df-eu 2568 df-clab 2714 df-cleq 2727 df-clel 2809 df-nfc 2885 df-ne 2933 df-nel 3037 df-ral 3052 df-rex 3061 df-rmo 3359 df-reu 3360 df-rab 3416 df-v 3461 df-sbc 3766 df-csb 3875 df-dif 3929 df-un 3931 df-in 3933 df-ss 3943 df-nul 4309 df-if 4501 df-pw 4577 df-sn 4602 df-pr 4604 df-op 4608 df-uni 4884 df-br 5120 df-opab 5182 df-mpt 5202 df-id 5548 df-po 5561 df-so 5562 df-xp 5660 df-rel 5661 df-cnv 5662 df-co 5663 df-dm 5664 df-rn 5665 df-res 5666 df-ima 5667 df-iota 6483 df-fun 6532 df-fn 6533 df-f 6534 df-f1 6535 df-fo 6536 df-f1o 6537 df-fv 6538 df-riota 7360 df-ov 7406 df-oprab 7407 df-mpo 7408 df-er 8717 df-en 8958 df-dom 8959 df-sdom 8960 df-pnf 11269 df-mnf 11270 df-xr 11271 df-ltxr 11272 df-le 11273 df-sub 11466 df-neg 11467 df-div 11893 |
| This theorem is referenced by: subrec 12069 lgamgulmlem3 26991 |
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