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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 11315 | . . 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 12151 | . 2 ⊢ (𝜑 → ((1 / 𝐴) − (1 / 𝐵)) = (((1 · 𝐵) − (1 · 𝐴)) / (𝐴 · 𝐵))) |
| 7 | 3 | mullidd 11340 | . . . 4 ⊢ (𝜑 → (1 · 𝐵) = 𝐵) |
| 8 | 2 | mullidd 11340 | . . . 4 ⊢ (𝜑 → (1 · 𝐴) = 𝐴) |
| 9 | 7, 8 | oveq12d 7448 | . . 3 ⊢ (𝜑 → ((1 · 𝐵) − (1 · 𝐴)) = (𝐵 − 𝐴)) |
| 10 | 9 | oveq1d 7445 | . 2 ⊢ (𝜑 → (((1 · 𝐵) − (1 · 𝐴)) / (𝐴 · 𝐵)) = ((𝐵 − 𝐴) / (𝐴 · 𝐵))) |
| 11 | 6, 10 | eqtrd 2798 | 1 ⊢ (𝜑 → ((1 / 𝐴) − (1 / 𝐵)) = ((𝐵 − 𝐴) / (𝐴 · 𝐵))) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 = wceq 1569 ∈ wcel 2146 ≠ wne 2959 (class class class)co 7430 ℂcc 11211 0cc0 11213 1c1 11214 · cmul 11218 − cmin 11554 / cdiv 11986 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1944 ax-6 2001 ax-7 2042 ax-8 2148 ax-9 2156 ax-10 2179 ax-11 2196 ax-12 2215 ax-ext 2735 ax-sep 5252 ax-nul 5263 ax-pow 5331 ax-pr 5395 ax-un 7761 ax-resscn 11270 ax-1cn 11271 ax-icn 11272 ax-addcl 11273 ax-addrcl 11274 ax-mulcl 11275 ax-mulrcl 11276 ax-mulcom 11277 ax-addass 11278 ax-mulass 11279 ax-distr 11280 ax-i2m1 11281 ax-1ne0 11282 ax-1rid 11283 ax-rnegex 11284 ax-rrecex 11285 ax-cnre 11286 ax-pre-lttri 11287 ax-pre-lttrn 11288 ax-pre-ltadd 11289 ax-pre-mulgt0 11290 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1572 df-fal 1582 df-ex 1812 df-nf 1816 df-sb 2101 df-mo 2567 df-eu 2597 df-clab 2742 df-cleq 2755 df-clel 2839 df-nfc 2913 df-ne 2960 df-nel 3066 df-ral 3081 df-rex 3091 df-rmo 3369 df-reu 3370 df-rab 3417 df-v 3456 df-sbc 3743 df-csb 3852 df-ss 3901 df-dif 4050 df-in 4094 df-un 4154 df-nul 4282 df-if 4486 df-pw 4562 df-sn 4589 df-pr 4591 df-op 4839 df-uni 4871 df-br 5107 df-opab 5171 df-mpt 5190 df-id 5550 df-po 5563 df-so 5564 df-xp 5661 df-rel 5662 df-cnv 5663 df-co 5664 df-dm 5665 df-rn 5666 df-res 5667 df-ima 5668 df-iota 6501 df-fun 6549 df-fn 6550 df-f 6551 df-f1 6552 df-fo 6553 df-f1o 6554 df-fv 6555 df-riota 7387 df-ov 7433 df-oprab 7434 df-mpo 7435 df-er 8731 df-en 8988 df-dom 8989 df-sdom 8990 df-pnf 11358 df-mnf 11359 df-xr 11360 df-ltxr 11361 df-le 11362 df-sub 11556 df-neg 11557 df-div 11987 |
| This theorem is used by: subrec 12160 lgamgulmlem3 27373 |
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