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| Mirrors > Home > MPE Home > Th. List > fproddvdsd | Structured version Visualization version GIF version | ||
| Description: A finite product of integers is divisible by any of its factors. (Contributed by AV, 14-Aug-2020.) (Proof shortened by AV, 2-Aug-2021.) |
| Ref | Expression |
|---|---|
| fproddvdsd.f | ⊢ (𝜑 → 𝐴 ∈ Fin) |
| fproddvdsd.s | ⊢ (𝜑 → 𝐴 ⊆ ℤ) |
| Ref | Expression |
|---|---|
| fproddvdsd | ⊢ (𝜑 → ∀𝑥 ∈ 𝐴 𝑥 ∥ ∏𝑘 ∈ 𝐴 𝑘) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | fproddvdsd.f | . . 3 ⊢ (𝜑 → 𝐴 ∈ Fin) | |
| 2 | fproddvdsd.s | . . 3 ⊢ (𝜑 → 𝐴 ⊆ ℤ) | |
| 3 | f1oi 6861 | . . . 4 ⊢ ( I ↾ ℤ):ℤ–1-1-onto→ℤ | |
| 4 | f1of 6822 | . . . 4 ⊢ (( I ↾ ℤ):ℤ–1-1-onto→ℤ → ( I ↾ ℤ):ℤ⟶ℤ) | |
| 5 | 3, 4 | mp1i 14 | . . 3 ⊢ (𝜑 → ( I ↾ ℤ):ℤ⟶ℤ) |
| 6 | 1, 2, 5 | fprodfvdvdsd 16497 | . 2 ⊢ (𝜑 → ∀𝑥 ∈ 𝐴 (( I ↾ ℤ)‘𝑥) ∥ ∏𝑘 ∈ 𝐴 (( I ↾ ℤ)‘𝑘)) |
| 7 | 2 | sselda 3931 | . . . . . 6 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝑥 ∈ ℤ) |
| 8 | fvresi 7176 | . . . . . 6 ⊢ (𝑥 ∈ ℤ → (( I ↾ ℤ)‘𝑥) = 𝑥) | |
| 9 | 7, 8 | syl 18 | . . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → (( I ↾ ℤ)‘𝑥) = 𝑥) |
| 10 | 9 | eqcomd 2767 | . . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝑥 = (( I ↾ ℤ)‘𝑥)) |
| 11 | 2 | sseld 3930 | . . . . . . . . 9 ⊢ (𝜑 → (𝑘 ∈ 𝐴 → 𝑘 ∈ ℤ)) |
| 12 | 11 | adantr 486 | . . . . . . . 8 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → (𝑘 ∈ 𝐴 → 𝑘 ∈ ℤ)) |
| 13 | 12 | imp 412 | . . . . . . 7 ⊢ (((𝜑 ∧ 𝑥 ∈ 𝐴) ∧ 𝑘 ∈ 𝐴) → 𝑘 ∈ ℤ) |
| 14 | fvresi 7176 | . . . . . . 7 ⊢ (𝑘 ∈ ℤ → (( I ↾ ℤ)‘𝑘) = 𝑘) | |
| 15 | 13, 14 | syl 18 | . . . . . 6 ⊢ (((𝜑 ∧ 𝑥 ∈ 𝐴) ∧ 𝑘 ∈ 𝐴) → (( I ↾ ℤ)‘𝑘) = 𝑘) |
| 16 | 15 | eqcomd 2767 | . . . . 5 ⊢ (((𝜑 ∧ 𝑥 ∈ 𝐴) ∧ 𝑘 ∈ 𝐴) → 𝑘 = (( I ↾ ℤ)‘𝑘)) |
| 17 | 16 | prodeq2dv 16083 | . . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → ∏𝑘 ∈ 𝐴 𝑘 = ∏𝑘 ∈ 𝐴 (( I ↾ ℤ)‘𝑘)) |
| 18 | 10, 17 | breq12d 5116 | . . 3 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → (𝑥 ∥ ∏𝑘 ∈ 𝐴 𝑘 ↔ (( I ↾ ℤ)‘𝑥) ∥ ∏𝑘 ∈ 𝐴 (( I ↾ ℤ)‘𝑘))) |
| 19 | 18 | ralbidva 3184 | . 2 ⊢ (𝜑 → (∀𝑥 ∈ 𝐴 𝑥 ∥ ∏𝑘 ∈ 𝐴 𝑘 ↔ ∀𝑥 ∈ 𝐴 (( I ↾ ℤ)‘𝑥) ∥ ∏𝑘 ∈ 𝐴 (( I ↾ ℤ)‘𝑘))) |
| 20 | 6, 19 | mpbird 260 | 1 ⊢ (𝜑 → ∀𝑥 ∈ 𝐴 𝑥 ∥ ∏𝑘 ∈ 𝐴 𝑘) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ∧ wa 401 = wceq 1570 ∈ wcel 2145 ∀wral 3077 ⊆ wss 3899 class class class wbr 5103 I cid 5545 ↾ cres 5653 ⟶wf 6533 –1-1-onto→wf1o 6536 ‘cfv 6537 Fincfn 8966 ℤcz 12686 ∏cprod 16065 ∥ cdvds 16415 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2213 ax-ext 2733 ax-rep 5232 ax-sep 5249 ax-nul 5260 ax-pow 5327 ax-pr 5391 ax-un 7749 ax-inf2 9635 ax-cnex 11249 ax-resscn 11250 ax-1cn 11251 ax-icn 11252 ax-addcl 11253 ax-addrcl 11254 ax-mulcl 11255 ax-mulrcl 11256 ax-mulcom 11257 ax-addass 11258 ax-mulass 11259 ax-distr 11260 ax-i2m1 11261 ax-1ne0 11262 ax-1rid 11263 ax-rnegex 11264 ax-rrecex 11265 ax-cnre 11266 ax-pre-lttri 11267 ax-pre-lttrn 11268 ax-pre-ltadd 11269 ax-pre-mulgt0 11270 ax-pre-sup 11271 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 df-mo 2565 df-eu 2595 df-clab 2740 df-cleq 2753 df-clel 2836 df-nfc 2910 df-ne 2957 df-nel 3063 df-ral 3078 df-rex 3088 df-rmo 3366 df-reu 3367 df-rab 3414 df-v 3453 df-sbc 3740 df-csb 3848 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-pss 3919 df-nul 4280 df-if 4483 df-pw 4559 df-sn 4585 df-pr 4587 df-op 4591 df-uni 4868 df-int 4908 df-iun 4953 df-br 5104 df-opab 5168 df-mpt 5187 df-tr 5213 df-id 5546 df-eprel 5551 df-po 5559 df-so 5560 df-fr 5604 df-se 5605 df-we 5606 df-xp 5657 df-rel 5658 df-cnv 5659 df-co 5660 df-dm 5661 df-rn 5662 df-res 5663 df-ima 5664 df-pred 6303 df-ord 6364 df-on 6365 df-lim 6366 df-suc 6367 df-iota 6493 df-fun 6539 df-fn 6540 df-f 6541 df-f1 6542 df-fo 6543 df-f1o 6544 df-fv 6545 df-isom 6546 df-riota 7375 df-ov 7421 df-oprab 7422 df-mpo 7423 df-om 7876 df-1st 7999 df-2nd 8000 df-frecs 8292 df-wrecs 8323 df-recs 8372 df-rdg 8411 df-1o 8469 df-er 8710 df-en 8967 df-dom 8968 df-sdom 8969 df-fin 8970 df-sup 9427 df-oi 9497 df-card 10013 df-pnf 11338 df-mnf 11339 df-xr 11340 df-ltxr 11341 df-le 11342 df-sub 11536 df-neg 11537 df-div 11967 df-nn 12329 df-2 12398 df-3 12399 df-n0 12600 df-z 12687 df-uz 12959 df-rp 13114 df-fz 13633 df-fzo 13782 df-seq 14138 df-exp 14198 df-hash 14468 df-cj 15259 df-re 15260 df-im 15261 df-sqrt 15395 df-abs 15396 df-clim 15648 df-prod 16066 df-dvds 16416 |
| This theorem is used by: absproddvds 16785 |
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