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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 6863 | . . . 4 ⊢ ( I ↾ ℤ):ℤ–1-1-onto→ℤ | |
| 4 | f1of 6824 | . . . 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 16409 | . 2 ⊢ (𝜑 → ∀𝑥 ∈ 𝐴 (( I ↾ ℤ)‘𝑥) ∥ ∏𝑘 ∈ 𝐴 (( I ↾ ℤ)‘𝑘)) |
| 7 | 2 | sselda 3938 | . . . . . 6 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝑥 ∈ ℤ) |
| 8 | fvresi 7175 | . . . . . 6 ⊢ (𝑥 ∈ ℤ → (( I ↾ ℤ)‘𝑥) = 𝑥) | |
| 9 | 7, 8 | syl 18 | . . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → (( I ↾ ℤ)‘𝑥) = 𝑥) |
| 10 | 9 | eqcomd 2771 | . . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝑥 = (( I ↾ ℤ)‘𝑥)) |
| 11 | 2 | sseld 3937 | . . . . . . . . 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 7175 | . . . . . . 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 2771 | . . . . 5 ⊢ (((𝜑 ∧ 𝑥 ∈ 𝐴) ∧ 𝑘 ∈ 𝐴) → 𝑘 = (( I ↾ ℤ)‘𝑘)) |
| 17 | 16 | prodeq2dv 15994 | . . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → ∏𝑘 ∈ 𝐴 𝑘 = ∏𝑘 ∈ 𝐴 (( I ↾ ℤ)‘𝑘)) |
| 18 | 10, 17 | breq12d 5124 | . . 3 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → (𝑥 ∥ ∏𝑘 ∈ 𝐴 𝑘 ↔ (( I ↾ ℤ)‘𝑥) ∥ ∏𝑘 ∈ 𝐴 (( I ↾ ℤ)‘𝑘))) |
| 19 | 18 | ralbidva 3188 | . 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 2146 ∀wral 3081 ⊆ wss 3906 class class class wbr 5111 I cid 5557 ↾ cres 5665 ⟶wf 6536 –1-1-onto→wf1o 6539 ‘cfv 6540 Fincfn 8945 ℤcz 12602 ∏cprod 15975 ∥ cdvds 16327 |
| 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 2148 ax-9 2156 ax-10 2179 ax-11 2195 ax-12 2216 ax-ext 2737 ax-rep 5240 ax-sep 5259 ax-nul 5271 ax-pow 5338 ax-pr 5406 ax-un 7738 ax-inf2 9613 ax-cnex 11167 ax-resscn 11168 ax-1cn 11169 ax-icn 11170 ax-addcl 11171 ax-addrcl 11172 ax-mulcl 11173 ax-mulrcl 11174 ax-mulcom 11175 ax-addass 11176 ax-mulass 11177 ax-distr 11178 ax-i2m1 11179 ax-1ne0 11180 ax-1rid 11181 ax-rnegex 11182 ax-rrecex 11183 ax-cnre 11184 ax-pre-lttri 11185 ax-pre-lttrn 11186 ax-pre-ltadd 11187 ax-pre-mulgt0 11188 ax-pre-sup 11189 |
| 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 2569 df-eu 2599 df-clab 2744 df-cleq 2757 df-clel 2840 df-nfc 2914 df-ne 2961 df-nel 3067 df-ral 3082 df-rex 3092 df-rmo 3371 df-reu 3372 df-rab 3419 df-v 3459 df-sbc 3747 df-csb 3855 df-dif 3909 df-un 3911 df-in 3913 df-ss 3923 df-pss 3926 df-nul 4287 df-if 4490 df-pw 4566 df-sn 4592 df-pr 4594 df-op 4598 df-uni 4875 df-int 4915 df-iun 4960 df-br 5112 df-opab 5176 df-mpt 5195 df-tr 5221 df-id 5558 df-eprel 5563 df-po 5571 df-so 5572 df-fr 5616 df-se 5617 df-we 5618 df-xp 5669 df-rel 5670 df-cnv 5671 df-co 5672 df-dm 5673 df-rn 5674 df-res 5675 df-ima 5676 df-pred 6306 df-ord 6367 df-on 6368 df-lim 6369 df-suc 6370 df-iota 6496 df-fun 6542 df-fn 6543 df-f 6544 df-f1 6545 df-fo 6546 df-f1o 6547 df-fv 6548 df-isom 6549 df-riota 7373 df-ov 7419 df-oprab 7420 df-mpo 7421 df-om 7865 df-1st 7988 df-2nd 7989 df-frecs 8280 df-wrecs 8311 df-recs 8360 df-rdg 8399 df-1o 8455 df-er 8696 df-en 8946 df-dom 8947 df-sdom 8948 df-fin 8949 df-sup 9405 df-oi 9475 df-card 9937 df-pnf 11256 df-mnf 11257 df-xr 11258 df-ltxr 11259 df-le 11260 df-sub 11454 df-neg 11455 df-div 11883 df-nn 12245 df-2 12314 df-3 12315 df-n0 12516 df-z 12603 df-uz 12874 df-rp 13028 df-fz 13547 df-fzo 13695 df-seq 14051 df-exp 14111 df-hash 14380 df-cj 15169 df-re 15170 df-im 15171 df-sqrt 15305 df-abs 15306 df-clim 15558 df-prod 15976 df-dvds 16328 |
| This theorem is used by: absproddvds 16692 |
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