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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 6885 | . . . 4 ⊢ ( I ↾ ℤ):ℤ–1-1-onto→ℤ | |
| 4 | f1of 6847 | . . . 4 ⊢ (( I ↾ ℤ):ℤ–1-1-onto→ℤ → ( I ↾ ℤ):ℤ⟶ℤ) | |
| 5 | 3, 4 | mp1i 13 | . . 3 ⊢ (𝜑 → ( I ↾ ℤ):ℤ⟶ℤ) | 
| 6 | 1, 2, 5 | fprodfvdvdsd 16372 | . 2 ⊢ (𝜑 → ∀𝑥 ∈ 𝐴 (( I ↾ ℤ)‘𝑥) ∥ ∏𝑘 ∈ 𝐴 (( I ↾ ℤ)‘𝑘)) | 
| 7 | 2 | sselda 3982 | . . . . . 6 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝑥 ∈ ℤ) | 
| 8 | fvresi 7194 | . . . . . 6 ⊢ (𝑥 ∈ ℤ → (( I ↾ ℤ)‘𝑥) = 𝑥) | |
| 9 | 7, 8 | syl 17 | . . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → (( I ↾ ℤ)‘𝑥) = 𝑥) | 
| 10 | 9 | eqcomd 2742 | . . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝑥 = (( I ↾ ℤ)‘𝑥)) | 
| 11 | 2 | sseld 3981 | . . . . . . . . 9 ⊢ (𝜑 → (𝑘 ∈ 𝐴 → 𝑘 ∈ ℤ)) | 
| 12 | 11 | adantr 480 | . . . . . . . 8 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → (𝑘 ∈ 𝐴 → 𝑘 ∈ ℤ)) | 
| 13 | 12 | imp 406 | . . . . . . 7 ⊢ (((𝜑 ∧ 𝑥 ∈ 𝐴) ∧ 𝑘 ∈ 𝐴) → 𝑘 ∈ ℤ) | 
| 14 | fvresi 7194 | . . . . . . 7 ⊢ (𝑘 ∈ ℤ → (( I ↾ ℤ)‘𝑘) = 𝑘) | |
| 15 | 13, 14 | syl 17 | . . . . . 6 ⊢ (((𝜑 ∧ 𝑥 ∈ 𝐴) ∧ 𝑘 ∈ 𝐴) → (( I ↾ ℤ)‘𝑘) = 𝑘) | 
| 16 | 15 | eqcomd 2742 | . . . . 5 ⊢ (((𝜑 ∧ 𝑥 ∈ 𝐴) ∧ 𝑘 ∈ 𝐴) → 𝑘 = (( I ↾ ℤ)‘𝑘)) | 
| 17 | 16 | prodeq2dv 15959 | . . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → ∏𝑘 ∈ 𝐴 𝑘 = ∏𝑘 ∈ 𝐴 (( I ↾ ℤ)‘𝑘)) | 
| 18 | 10, 17 | breq12d 5155 | . . 3 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → (𝑥 ∥ ∏𝑘 ∈ 𝐴 𝑘 ↔ (( I ↾ ℤ)‘𝑥) ∥ ∏𝑘 ∈ 𝐴 (( I ↾ ℤ)‘𝑘))) | 
| 19 | 18 | ralbidva 3175 | . 2 ⊢ (𝜑 → (∀𝑥 ∈ 𝐴 𝑥 ∥ ∏𝑘 ∈ 𝐴 𝑘 ↔ ∀𝑥 ∈ 𝐴 (( I ↾ ℤ)‘𝑥) ∥ ∏𝑘 ∈ 𝐴 (( I ↾ ℤ)‘𝑘))) | 
| 20 | 6, 19 | mpbird 257 | 1 ⊢ (𝜑 → ∀𝑥 ∈ 𝐴 𝑥 ∥ ∏𝑘 ∈ 𝐴 𝑘) | 
| Colors of variables: wff setvar class | 
| Syntax hints: → wi 4 ∧ wa 395 = wceq 1539 ∈ wcel 2107 ∀wral 3060 ⊆ wss 3950 class class class wbr 5142 I cid 5576 ↾ cres 5686 ⟶wf 6556 –1-1-onto→wf1o 6559 ‘cfv 6560 Fincfn 8986 ℤcz 12615 ∏cprod 15940 ∥ cdvds 16291 | 
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1794 ax-4 1808 ax-5 1909 ax-6 1966 ax-7 2006 ax-8 2109 ax-9 2117 ax-10 2140 ax-11 2156 ax-12 2176 ax-ext 2707 ax-rep 5278 ax-sep 5295 ax-nul 5305 ax-pow 5364 ax-pr 5431 ax-un 7756 ax-inf2 9682 ax-cnex 11212 ax-resscn 11213 ax-1cn 11214 ax-icn 11215 ax-addcl 11216 ax-addrcl 11217 ax-mulcl 11218 ax-mulrcl 11219 ax-mulcom 11220 ax-addass 11221 ax-mulass 11222 ax-distr 11223 ax-i2m1 11224 ax-1ne0 11225 ax-1rid 11226 ax-rnegex 11227 ax-rrecex 11228 ax-cnre 11229 ax-pre-lttri 11230 ax-pre-lttrn 11231 ax-pre-ltadd 11232 ax-pre-mulgt0 11233 ax-pre-sup 11234 | 
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1542 df-fal 1552 df-ex 1779 df-nf 1783 df-sb 2064 df-mo 2539 df-eu 2568 df-clab 2714 df-cleq 2728 df-clel 2815 df-nfc 2891 df-ne 2940 df-nel 3046 df-ral 3061 df-rex 3070 df-rmo 3379 df-reu 3380 df-rab 3436 df-v 3481 df-sbc 3788 df-csb 3899 df-dif 3953 df-un 3955 df-in 3957 df-ss 3967 df-pss 3970 df-nul 4333 df-if 4525 df-pw 4601 df-sn 4626 df-pr 4628 df-op 4632 df-uni 4907 df-int 4946 df-iun 4992 df-br 5143 df-opab 5205 df-mpt 5225 df-tr 5259 df-id 5577 df-eprel 5583 df-po 5591 df-so 5592 df-fr 5636 df-se 5637 df-we 5638 df-xp 5690 df-rel 5691 df-cnv 5692 df-co 5693 df-dm 5694 df-rn 5695 df-res 5696 df-ima 5697 df-pred 6320 df-ord 6386 df-on 6387 df-lim 6388 df-suc 6389 df-iota 6513 df-fun 6562 df-fn 6563 df-f 6564 df-f1 6565 df-fo 6566 df-f1o 6567 df-fv 6568 df-isom 6569 df-riota 7389 df-ov 7435 df-oprab 7436 df-mpo 7437 df-om 7889 df-1st 8015 df-2nd 8016 df-frecs 8307 df-wrecs 8338 df-recs 8412 df-rdg 8451 df-1o 8507 df-er 8746 df-en 8987 df-dom 8988 df-sdom 8989 df-fin 8990 df-sup 9483 df-oi 9551 df-card 9980 df-pnf 11298 df-mnf 11299 df-xr 11300 df-ltxr 11301 df-le 11302 df-sub 11495 df-neg 11496 df-div 11922 df-nn 12268 df-2 12330 df-3 12331 df-n0 12529 df-z 12616 df-uz 12880 df-rp 13036 df-fz 13549 df-fzo 13696 df-seq 14044 df-exp 14104 df-hash 14371 df-cj 15139 df-re 15140 df-im 15141 df-sqrt 15275 df-abs 15276 df-clim 15525 df-prod 15941 df-dvds 16292 | 
| This theorem is referenced by: absproddvds 16655 | 
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