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| Mirrors > Home > ILE Home > Th. List > mul0eqap | GIF version | ||
| Description: If two numbers are apart from each other and their product is zero, one of them must be zero. (Contributed by Jim Kingdon, 31-Jul-2023.) |
| Ref | Expression |
|---|---|
| mul0eqap.a | ⊢ (𝜑 → 𝐴 ∈ ℂ) |
| mul0eqap.b | ⊢ (𝜑 → 𝐵 ∈ ℂ) |
| mul0eqap.ab | ⊢ (𝜑 → 𝐴 # 𝐵) |
| mul0eqap.0 | ⊢ (𝜑 → (𝐴 · 𝐵) = 0) |
| Ref | Expression |
|---|---|
| mul0eqap | ⊢ (𝜑 → (𝐴 = 0 ∨ 𝐵 = 0)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | mul0eqap.ab | . . . 4 ⊢ (𝜑 → 𝐴 # 𝐵) | |
| 2 | mul0eqap.a | . . . . 5 ⊢ (𝜑 → 𝐴 ∈ ℂ) | |
| 3 | mul0eqap.b | . . . . 5 ⊢ (𝜑 → 𝐵 ∈ ℂ) | |
| 4 | 0cnd 8162 | . . . . 5 ⊢ (𝜑 → 0 ∈ ℂ) | |
| 5 | apcotr 8777 | . . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 0 ∈ ℂ) → (𝐴 # 𝐵 → (𝐴 # 0 ∨ 𝐵 # 0))) | |
| 6 | 2, 3, 4, 5 | syl3anc 1271 | . . . 4 ⊢ (𝜑 → (𝐴 # 𝐵 → (𝐴 # 0 ∨ 𝐵 # 0))) |
| 7 | 1, 6 | mpd 13 | . . 3 ⊢ (𝜑 → (𝐴 # 0 ∨ 𝐵 # 0)) |
| 8 | mul0eqap.0 | . . . . . . 7 ⊢ (𝜑 → (𝐴 · 𝐵) = 0) | |
| 9 | 8 | adantr 276 | . . . . . 6 ⊢ ((𝜑 ∧ 𝐴 # 0) → (𝐴 · 𝐵) = 0) |
| 10 | 3 | adantr 276 | . . . . . . 7 ⊢ ((𝜑 ∧ 𝐴 # 0) → 𝐵 ∈ ℂ) |
| 11 | 0cnd 8162 | . . . . . . 7 ⊢ ((𝜑 ∧ 𝐴 # 0) → 0 ∈ ℂ) | |
| 12 | 2, 3 | mulcld 8190 | . . . . . . . 8 ⊢ (𝜑 → (𝐴 · 𝐵) ∈ ℂ) |
| 13 | 12 | adantr 276 | . . . . . . 7 ⊢ ((𝜑 ∧ 𝐴 # 0) → (𝐴 · 𝐵) ∈ ℂ) |
| 14 | ibar 301 | . . . . . . . 8 ⊢ (𝐴 # 0 → (𝐵 # 0 ↔ (𝐴 # 0 ∧ 𝐵 # 0))) | |
| 15 | 2, 3 | mulap0bd 8827 | . . . . . . . 8 ⊢ (𝜑 → ((𝐴 # 0 ∧ 𝐵 # 0) ↔ (𝐴 · 𝐵) # 0)) |
| 16 | 14, 15 | sylan9bbr 463 | . . . . . . 7 ⊢ ((𝜑 ∧ 𝐴 # 0) → (𝐵 # 0 ↔ (𝐴 · 𝐵) # 0)) |
| 17 | 10, 11, 13, 11, 16 | apcon4bid 8794 | . . . . . 6 ⊢ ((𝜑 ∧ 𝐴 # 0) → (𝐵 = 0 ↔ (𝐴 · 𝐵) = 0)) |
| 18 | 9, 17 | mpbird 167 | . . . . 5 ⊢ ((𝜑 ∧ 𝐴 # 0) → 𝐵 = 0) |
| 19 | 18 | ex 115 | . . . 4 ⊢ (𝜑 → (𝐴 # 0 → 𝐵 = 0)) |
| 20 | 8 | adantr 276 | . . . . . 6 ⊢ ((𝜑 ∧ 𝐵 # 0) → (𝐴 · 𝐵) = 0) |
| 21 | 2 | adantr 276 | . . . . . . 7 ⊢ ((𝜑 ∧ 𝐵 # 0) → 𝐴 ∈ ℂ) |
| 22 | 0cnd 8162 | . . . . . . 7 ⊢ ((𝜑 ∧ 𝐵 # 0) → 0 ∈ ℂ) | |
| 23 | 12 | adantr 276 | . . . . . . 7 ⊢ ((𝜑 ∧ 𝐵 # 0) → (𝐴 · 𝐵) ∈ ℂ) |
| 24 | iba 300 | . . . . . . . 8 ⊢ (𝐵 # 0 → (𝐴 # 0 ↔ (𝐴 # 0 ∧ 𝐵 # 0))) | |
| 25 | 24, 15 | sylan9bbr 463 | . . . . . . 7 ⊢ ((𝜑 ∧ 𝐵 # 0) → (𝐴 # 0 ↔ (𝐴 · 𝐵) # 0)) |
| 26 | 21, 22, 23, 22, 25 | apcon4bid 8794 | . . . . . 6 ⊢ ((𝜑 ∧ 𝐵 # 0) → (𝐴 = 0 ↔ (𝐴 · 𝐵) = 0)) |
| 27 | 20, 26 | mpbird 167 | . . . . 5 ⊢ ((𝜑 ∧ 𝐵 # 0) → 𝐴 = 0) |
| 28 | 27 | ex 115 | . . . 4 ⊢ (𝜑 → (𝐵 # 0 → 𝐴 = 0)) |
| 29 | 19, 28 | orim12d 791 | . . 3 ⊢ (𝜑 → ((𝐴 # 0 ∨ 𝐵 # 0) → (𝐵 = 0 ∨ 𝐴 = 0))) |
| 30 | 7, 29 | mpd 13 | . 2 ⊢ (𝜑 → (𝐵 = 0 ∨ 𝐴 = 0)) |
| 31 | 30 | orcomd 734 | 1 ⊢ (𝜑 → (𝐴 = 0 ∨ 𝐵 = 0)) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∧ wa 104 ∨ wo 713 = wceq 1395 ∈ wcel 2200 class class class wbr 4086 (class class class)co 6013 ℂcc 8020 0cc0 8022 · cmul 8027 # cap 8751 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 617 ax-in2 618 ax-io 714 ax-5 1493 ax-7 1494 ax-gen 1495 ax-ie1 1539 ax-ie2 1540 ax-8 1550 ax-10 1551 ax-11 1552 ax-i12 1553 ax-bndl 1555 ax-4 1556 ax-17 1572 ax-i9 1576 ax-ial 1580 ax-i5r 1581 ax-13 2202 ax-14 2203 ax-ext 2211 ax-sep 4205 ax-pow 4262 ax-pr 4297 ax-un 4528 ax-setind 4633 ax-cnex 8113 ax-resscn 8114 ax-1cn 8115 ax-1re 8116 ax-icn 8117 ax-addcl 8118 ax-addrcl 8119 ax-mulcl 8120 ax-mulrcl 8121 ax-addcom 8122 ax-mulcom 8123 ax-addass 8124 ax-mulass 8125 ax-distr 8126 ax-i2m1 8127 ax-0lt1 8128 ax-1rid 8129 ax-0id 8130 ax-rnegex 8131 ax-precex 8132 ax-cnre 8133 ax-pre-ltirr 8134 ax-pre-ltwlin 8135 ax-pre-lttrn 8136 ax-pre-apti 8137 ax-pre-ltadd 8138 ax-pre-mulgt0 8139 ax-pre-mulext 8140 |
| This theorem depends on definitions: df-bi 117 df-3an 1004 df-tru 1398 df-fal 1401 df-nf 1507 df-sb 1809 df-eu 2080 df-mo 2081 df-clab 2216 df-cleq 2222 df-clel 2225 df-nfc 2361 df-ne 2401 df-nel 2496 df-ral 2513 df-rex 2514 df-reu 2515 df-rab 2517 df-v 2802 df-sbc 3030 df-dif 3200 df-un 3202 df-in 3204 df-ss 3211 df-pw 3652 df-sn 3673 df-pr 3674 df-op 3676 df-uni 3892 df-br 4087 df-opab 4149 df-id 4388 df-po 4391 df-iso 4392 df-xp 4729 df-rel 4730 df-cnv 4731 df-co 4732 df-dm 4733 df-iota 5284 df-fun 5326 df-fv 5332 df-riota 5966 df-ov 6016 df-oprab 6017 df-mpo 6018 df-pnf 8206 df-mnf 8207 df-xr 8208 df-ltxr 8209 df-le 8210 df-sub 8342 df-neg 8343 df-reap 8745 df-ap 8752 |
| This theorem is referenced by: (None) |
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