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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 6806 | . . . 4 ⊢ ( I ↾ ℤ):ℤ–1-1-onto→ℤ | |
| 4 | f1of 6768 | . . . 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 16263 | . 2 ⊢ (𝜑 → ∀𝑥 ∈ 𝐴 (( I ↾ ℤ)‘𝑥) ∥ ∏𝑘 ∈ 𝐴 (( I ↾ ℤ)‘𝑘)) |
| 7 | 2 | sselda 3937 | . . . . . 6 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝑥 ∈ ℤ) |
| 8 | fvresi 7113 | . . . . . 6 ⊢ (𝑥 ∈ ℤ → (( I ↾ ℤ)‘𝑥) = 𝑥) | |
| 9 | 7, 8 | syl 17 | . . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → (( I ↾ ℤ)‘𝑥) = 𝑥) |
| 10 | 9 | eqcomd 2735 | . . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝑥 = (( I ↾ ℤ)‘𝑥)) |
| 11 | 2 | sseld 3936 | . . . . . . . . 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 7113 | . . . . . . 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 2735 | . . . . 5 ⊢ (((𝜑 ∧ 𝑥 ∈ 𝐴) ∧ 𝑘 ∈ 𝐴) → 𝑘 = (( I ↾ ℤ)‘𝑘)) |
| 17 | 16 | prodeq2dv 15847 | . . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → ∏𝑘 ∈ 𝐴 𝑘 = ∏𝑘 ∈ 𝐴 (( I ↾ ℤ)‘𝑘)) |
| 18 | 10, 17 | breq12d 5108 | . . 3 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → (𝑥 ∥ ∏𝑘 ∈ 𝐴 𝑘 ↔ (( I ↾ ℤ)‘𝑥) ∥ ∏𝑘 ∈ 𝐴 (( I ↾ ℤ)‘𝑘))) |
| 19 | 18 | ralbidva 3150 | . 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 1540 ∈ wcel 2109 ∀wral 3044 ⊆ wss 3905 class class class wbr 5095 I cid 5517 ↾ cres 5625 ⟶wf 6482 –1-1-onto→wf1o 6485 ‘cfv 6486 Fincfn 8879 ℤcz 12489 ∏cprod 15828 ∥ cdvds 16181 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1967 ax-7 2008 ax-8 2111 ax-9 2119 ax-10 2142 ax-11 2158 ax-12 2178 ax-ext 2701 ax-rep 5221 ax-sep 5238 ax-nul 5248 ax-pow 5307 ax-pr 5374 ax-un 7675 ax-inf2 9556 ax-cnex 11084 ax-resscn 11085 ax-1cn 11086 ax-icn 11087 ax-addcl 11088 ax-addrcl 11089 ax-mulcl 11090 ax-mulrcl 11091 ax-mulcom 11092 ax-addass 11093 ax-mulass 11094 ax-distr 11095 ax-i2m1 11096 ax-1ne0 11097 ax-1rid 11098 ax-rnegex 11099 ax-rrecex 11100 ax-cnre 11101 ax-pre-lttri 11102 ax-pre-lttrn 11103 ax-pre-ltadd 11104 ax-pre-mulgt0 11105 ax-pre-sup 11106 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2066 df-mo 2533 df-eu 2562 df-clab 2708 df-cleq 2721 df-clel 2803 df-nfc 2878 df-ne 2926 df-nel 3030 df-ral 3045 df-rex 3054 df-rmo 3345 df-reu 3346 df-rab 3397 df-v 3440 df-sbc 3745 df-csb 3854 df-dif 3908 df-un 3910 df-in 3912 df-ss 3922 df-pss 3925 df-nul 4287 df-if 4479 df-pw 4555 df-sn 4580 df-pr 4582 df-op 4586 df-uni 4862 df-int 4900 df-iun 4946 df-br 5096 df-opab 5158 df-mpt 5177 df-tr 5203 df-id 5518 df-eprel 5523 df-po 5531 df-so 5532 df-fr 5576 df-se 5577 df-we 5578 df-xp 5629 df-rel 5630 df-cnv 5631 df-co 5632 df-dm 5633 df-rn 5634 df-res 5635 df-ima 5636 df-pred 6253 df-ord 6314 df-on 6315 df-lim 6316 df-suc 6317 df-iota 6442 df-fun 6488 df-fn 6489 df-f 6490 df-f1 6491 df-fo 6492 df-f1o 6493 df-fv 6494 df-isom 6495 df-riota 7310 df-ov 7356 df-oprab 7357 df-mpo 7358 df-om 7807 df-1st 7931 df-2nd 7932 df-frecs 8221 df-wrecs 8252 df-recs 8301 df-rdg 8339 df-1o 8395 df-er 8632 df-en 8880 df-dom 8881 df-sdom 8882 df-fin 8883 df-sup 9351 df-oi 9421 df-card 9854 df-pnf 11170 df-mnf 11171 df-xr 11172 df-ltxr 11173 df-le 11174 df-sub 11367 df-neg 11368 df-div 11796 df-nn 12147 df-2 12209 df-3 12210 df-n0 12403 df-z 12490 df-uz 12754 df-rp 12912 df-fz 13429 df-fzo 13576 df-seq 13927 df-exp 13987 df-hash 14256 df-cj 15024 df-re 15025 df-im 15026 df-sqrt 15160 df-abs 15161 df-clim 15413 df-prod 15829 df-dvds 16182 |
| This theorem is referenced by: absproddvds 16546 |
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