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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 8267 | . . . . 5 ⊢ (𝜑 → 0 ∈ ℂ) | |
| 5 | apcotr 8881 | . . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 0 ∈ ℂ) → (𝐴 # 𝐵 → (𝐴 # 0 ∨ 𝐵 # 0))) | |
| 6 | 2, 3, 4, 5 | syl3anc 1274 | . . . 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 8267 | . . . . . . 7 ⊢ ((𝜑 ∧ 𝐴 # 0) → 0 ∈ ℂ) | |
| 12 | 2, 3 | mulcld 8294 | . . . . . . . 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 8931 | . . . . . . . 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 8898 | . . . . . 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 8267 | . . . . . . 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 8898 | . . . . . 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 794 | . . 3 ⊢ (𝜑 → ((𝐴 # 0 ∨ 𝐵 # 0) → (𝐵 = 0 ∨ 𝐴 = 0))) |
| 30 | 7, 29 | mpd 13 | . 2 ⊢ (𝜑 → (𝐵 = 0 ∨ 𝐴 = 0)) |
| 31 | 30 | orcomd 737 | 1 ⊢ (𝜑 → (𝐴 = 0 ∨ 𝐵 = 0)) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∧ wa 104 ∨ wo 716 = wceq 1398 ∈ wcel 2203 class class class wbr 4109 (class class class)co 6050 ℂcc 8125 0cc0 8127 · cmul 8132 # cap 8855 |
| 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 619 ax-in2 620 ax-io 717 ax-5 1496 ax-7 1497 ax-gen 1498 ax-ie1 1542 ax-ie2 1543 ax-8 1553 ax-10 1554 ax-11 1555 ax-i12 1556 ax-bndl 1558 ax-4 1559 ax-17 1575 ax-i9 1579 ax-ial 1583 ax-i5r 1584 ax-13 2205 ax-14 2206 ax-ext 2214 ax-sep 4228 ax-pow 4287 ax-pr 4322 ax-un 4554 ax-setind 4659 ax-cnex 8218 ax-resscn 8219 ax-1cn 8220 ax-1re 8221 ax-icn 8222 ax-addcl 8223 ax-addrcl 8224 ax-mulcl 8225 ax-mulrcl 8226 ax-addcom 8227 ax-mulcom 8228 ax-addass 8229 ax-mulass 8230 ax-distr 8231 ax-i2m1 8232 ax-0lt1 8233 ax-1rid 8234 ax-0id 8235 ax-rnegex 8236 ax-precex 8237 ax-cnre 8238 ax-pre-ltirr 8239 ax-pre-ltwlin 8240 ax-pre-lttrn 8241 ax-pre-apti 8242 ax-pre-ltadd 8243 ax-pre-mulgt0 8244 ax-pre-mulext 8245 |
| This theorem depends on definitions: df-bi 117 df-3an 1007 df-tru 1401 df-fal 1404 df-nf 1510 df-sb 1812 df-eu 2083 df-mo 2084 df-clab 2219 df-cleq 2225 df-clel 2228 df-nfc 2373 df-ne 2413 df-nel 2508 df-ral 2525 df-rex 2526 df-reu 2527 df-rab 2529 df-v 2815 df-sbc 3043 df-dif 3213 df-un 3215 df-in 3217 df-ss 3224 df-pw 3671 df-sn 3695 df-pr 3696 df-op 3698 df-uni 3915 df-br 4110 df-opab 4172 df-id 4414 df-po 4417 df-iso 4418 df-xp 4755 df-rel 4756 df-cnv 4757 df-co 4758 df-dm 4759 df-iota 5312 df-fun 5354 df-fv 5360 df-riota 6003 df-ov 6053 df-oprab 6054 df-mpo 6055 df-pnf 8310 df-mnf 8311 df-xr 8312 df-ltxr 8313 df-le 8314 df-sub 8446 df-neg 8447 df-reap 8849 df-ap 8856 |
| This theorem is referenced by: (None) |
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