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Mirrors > Home > ILE Home > Th. List > mulcanapd | GIF version |
Description: Cancellation law for multiplication. (Contributed by Jim Kingdon, 21-Feb-2020.) |
Ref | Expression |
---|---|
mulcand.1 | ⊢ (𝜑 → 𝐴 ∈ ℂ) |
mulcand.2 | ⊢ (𝜑 → 𝐵 ∈ ℂ) |
mulcand.3 | ⊢ (𝜑 → 𝐶 ∈ ℂ) |
mulcand.4 | ⊢ (𝜑 → 𝐶 # 0) |
Ref | Expression |
---|---|
mulcanapd | ⊢ (𝜑 → ((𝐶 · 𝐴) = (𝐶 · 𝐵) ↔ 𝐴 = 𝐵)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | mulcand.3 | . . . 4 ⊢ (𝜑 → 𝐶 ∈ ℂ) | |
2 | mulcand.4 | . . . 4 ⊢ (𝜑 → 𝐶 # 0) | |
3 | recexap 8550 | . . . 4 ⊢ ((𝐶 ∈ ℂ ∧ 𝐶 # 0) → ∃𝑥 ∈ ℂ (𝐶 · 𝑥) = 1) | |
4 | 1, 2, 3 | syl2anc 409 | . . 3 ⊢ (𝜑 → ∃𝑥 ∈ ℂ (𝐶 · 𝑥) = 1) |
5 | oveq2 5850 | . . . 4 ⊢ ((𝐶 · 𝐴) = (𝐶 · 𝐵) → (𝑥 · (𝐶 · 𝐴)) = (𝑥 · (𝐶 · 𝐵))) | |
6 | simprl 521 | . . . . . . . . 9 ⊢ ((𝜑 ∧ (𝑥 ∈ ℂ ∧ (𝐶 · 𝑥) = 1)) → 𝑥 ∈ ℂ) | |
7 | 1 | adantr 274 | . . . . . . . . 9 ⊢ ((𝜑 ∧ (𝑥 ∈ ℂ ∧ (𝐶 · 𝑥) = 1)) → 𝐶 ∈ ℂ) |
8 | 6, 7 | mulcomd 7920 | . . . . . . . 8 ⊢ ((𝜑 ∧ (𝑥 ∈ ℂ ∧ (𝐶 · 𝑥) = 1)) → (𝑥 · 𝐶) = (𝐶 · 𝑥)) |
9 | simprr 522 | . . . . . . . 8 ⊢ ((𝜑 ∧ (𝑥 ∈ ℂ ∧ (𝐶 · 𝑥) = 1)) → (𝐶 · 𝑥) = 1) | |
10 | 8, 9 | eqtrd 2198 | . . . . . . 7 ⊢ ((𝜑 ∧ (𝑥 ∈ ℂ ∧ (𝐶 · 𝑥) = 1)) → (𝑥 · 𝐶) = 1) |
11 | 10 | oveq1d 5857 | . . . . . 6 ⊢ ((𝜑 ∧ (𝑥 ∈ ℂ ∧ (𝐶 · 𝑥) = 1)) → ((𝑥 · 𝐶) · 𝐴) = (1 · 𝐴)) |
12 | mulcand.1 | . . . . . . . 8 ⊢ (𝜑 → 𝐴 ∈ ℂ) | |
13 | 12 | adantr 274 | . . . . . . 7 ⊢ ((𝜑 ∧ (𝑥 ∈ ℂ ∧ (𝐶 · 𝑥) = 1)) → 𝐴 ∈ ℂ) |
14 | 6, 7, 13 | mulassd 7922 | . . . . . 6 ⊢ ((𝜑 ∧ (𝑥 ∈ ℂ ∧ (𝐶 · 𝑥) = 1)) → ((𝑥 · 𝐶) · 𝐴) = (𝑥 · (𝐶 · 𝐴))) |
15 | 13 | mulid2d 7917 | . . . . . 6 ⊢ ((𝜑 ∧ (𝑥 ∈ ℂ ∧ (𝐶 · 𝑥) = 1)) → (1 · 𝐴) = 𝐴) |
16 | 11, 14, 15 | 3eqtr3d 2206 | . . . . 5 ⊢ ((𝜑 ∧ (𝑥 ∈ ℂ ∧ (𝐶 · 𝑥) = 1)) → (𝑥 · (𝐶 · 𝐴)) = 𝐴) |
17 | 10 | oveq1d 5857 | . . . . . 6 ⊢ ((𝜑 ∧ (𝑥 ∈ ℂ ∧ (𝐶 · 𝑥) = 1)) → ((𝑥 · 𝐶) · 𝐵) = (1 · 𝐵)) |
18 | mulcand.2 | . . . . . . . 8 ⊢ (𝜑 → 𝐵 ∈ ℂ) | |
19 | 18 | adantr 274 | . . . . . . 7 ⊢ ((𝜑 ∧ (𝑥 ∈ ℂ ∧ (𝐶 · 𝑥) = 1)) → 𝐵 ∈ ℂ) |
20 | 6, 7, 19 | mulassd 7922 | . . . . . 6 ⊢ ((𝜑 ∧ (𝑥 ∈ ℂ ∧ (𝐶 · 𝑥) = 1)) → ((𝑥 · 𝐶) · 𝐵) = (𝑥 · (𝐶 · 𝐵))) |
21 | 19 | mulid2d 7917 | . . . . . 6 ⊢ ((𝜑 ∧ (𝑥 ∈ ℂ ∧ (𝐶 · 𝑥) = 1)) → (1 · 𝐵) = 𝐵) |
22 | 17, 20, 21 | 3eqtr3d 2206 | . . . . 5 ⊢ ((𝜑 ∧ (𝑥 ∈ ℂ ∧ (𝐶 · 𝑥) = 1)) → (𝑥 · (𝐶 · 𝐵)) = 𝐵) |
23 | 16, 22 | eqeq12d 2180 | . . . 4 ⊢ ((𝜑 ∧ (𝑥 ∈ ℂ ∧ (𝐶 · 𝑥) = 1)) → ((𝑥 · (𝐶 · 𝐴)) = (𝑥 · (𝐶 · 𝐵)) ↔ 𝐴 = 𝐵)) |
24 | 5, 23 | syl5ib 153 | . . 3 ⊢ ((𝜑 ∧ (𝑥 ∈ ℂ ∧ (𝐶 · 𝑥) = 1)) → ((𝐶 · 𝐴) = (𝐶 · 𝐵) → 𝐴 = 𝐵)) |
25 | 4, 24 | rexlimddv 2588 | . 2 ⊢ (𝜑 → ((𝐶 · 𝐴) = (𝐶 · 𝐵) → 𝐴 = 𝐵)) |
26 | oveq2 5850 | . 2 ⊢ (𝐴 = 𝐵 → (𝐶 · 𝐴) = (𝐶 · 𝐵)) | |
27 | 25, 26 | impbid1 141 | 1 ⊢ (𝜑 → ((𝐶 · 𝐴) = (𝐶 · 𝐵) ↔ 𝐴 = 𝐵)) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∧ wa 103 ↔ wb 104 = wceq 1343 ∈ wcel 2136 ∃wrex 2445 class class class wbr 3982 (class class class)co 5842 ℂcc 7751 0cc0 7753 1c1 7754 · cmul 7758 # cap 8479 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 604 ax-in2 605 ax-io 699 ax-5 1435 ax-7 1436 ax-gen 1437 ax-ie1 1481 ax-ie2 1482 ax-8 1492 ax-10 1493 ax-11 1494 ax-i12 1495 ax-bndl 1497 ax-4 1498 ax-17 1514 ax-i9 1518 ax-ial 1522 ax-i5r 1523 ax-13 2138 ax-14 2139 ax-ext 2147 ax-sep 4100 ax-pow 4153 ax-pr 4187 ax-un 4411 ax-setind 4514 ax-cnex 7844 ax-resscn 7845 ax-1cn 7846 ax-1re 7847 ax-icn 7848 ax-addcl 7849 ax-addrcl 7850 ax-mulcl 7851 ax-mulrcl 7852 ax-addcom 7853 ax-mulcom 7854 ax-addass 7855 ax-mulass 7856 ax-distr 7857 ax-i2m1 7858 ax-0lt1 7859 ax-1rid 7860 ax-0id 7861 ax-rnegex 7862 ax-precex 7863 ax-cnre 7864 ax-pre-ltirr 7865 ax-pre-ltwlin 7866 ax-pre-lttrn 7867 ax-pre-apti 7868 ax-pre-ltadd 7869 ax-pre-mulgt0 7870 ax-pre-mulext 7871 |
This theorem depends on definitions: df-bi 116 df-3an 970 df-tru 1346 df-fal 1349 df-nf 1449 df-sb 1751 df-eu 2017 df-mo 2018 df-clab 2152 df-cleq 2158 df-clel 2161 df-nfc 2297 df-ne 2337 df-nel 2432 df-ral 2449 df-rex 2450 df-reu 2451 df-rab 2453 df-v 2728 df-sbc 2952 df-dif 3118 df-un 3120 df-in 3122 df-ss 3129 df-pw 3561 df-sn 3582 df-pr 3583 df-op 3585 df-uni 3790 df-br 3983 df-opab 4044 df-id 4271 df-po 4274 df-iso 4275 df-xp 4610 df-rel 4611 df-cnv 4612 df-co 4613 df-dm 4614 df-iota 5153 df-fun 5190 df-fv 5196 df-riota 5798 df-ov 5845 df-oprab 5846 df-mpo 5847 df-pnf 7935 df-mnf 7936 df-xr 7937 df-ltxr 7938 df-le 7939 df-sub 8071 df-neg 8072 df-reap 8473 df-ap 8480 |
This theorem is referenced by: mulcanap2d 8559 mulcanapad 8560 mulcanap 8562 div11ap 8596 eqneg 8628 dvdscmulr 11760 qredeq 12028 cncongr1 12035 |
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