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Mirrors > Home > MPE Home > Th. List > nnmulcl | Structured version Visualization version GIF version |
Description: Closure of multiplication of positive integers. (Contributed by NM, 12-Jan-1997.) Remove dependency on ax-mulcom 10590 and ax-mulass 10592. (Revised by Steven Nguyen, 24-Sep-2022.) |
Ref | Expression |
---|---|
nnmulcl | ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ) → (𝐴 · 𝐵) ∈ ℕ) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | oveq2 7143 | . . . . 5 ⊢ (𝑥 = 1 → (𝐴 · 𝑥) = (𝐴 · 1)) | |
2 | 1 | eleq1d 2874 | . . . 4 ⊢ (𝑥 = 1 → ((𝐴 · 𝑥) ∈ ℕ ↔ (𝐴 · 1) ∈ ℕ)) |
3 | 2 | imbi2d 344 | . . 3 ⊢ (𝑥 = 1 → ((𝐴 ∈ ℕ → (𝐴 · 𝑥) ∈ ℕ) ↔ (𝐴 ∈ ℕ → (𝐴 · 1) ∈ ℕ))) |
4 | oveq2 7143 | . . . . 5 ⊢ (𝑥 = 𝑦 → (𝐴 · 𝑥) = (𝐴 · 𝑦)) | |
5 | 4 | eleq1d 2874 | . . . 4 ⊢ (𝑥 = 𝑦 → ((𝐴 · 𝑥) ∈ ℕ ↔ (𝐴 · 𝑦) ∈ ℕ)) |
6 | 5 | imbi2d 344 | . . 3 ⊢ (𝑥 = 𝑦 → ((𝐴 ∈ ℕ → (𝐴 · 𝑥) ∈ ℕ) ↔ (𝐴 ∈ ℕ → (𝐴 · 𝑦) ∈ ℕ))) |
7 | oveq2 7143 | . . . . 5 ⊢ (𝑥 = (𝑦 + 1) → (𝐴 · 𝑥) = (𝐴 · (𝑦 + 1))) | |
8 | 7 | eleq1d 2874 | . . . 4 ⊢ (𝑥 = (𝑦 + 1) → ((𝐴 · 𝑥) ∈ ℕ ↔ (𝐴 · (𝑦 + 1)) ∈ ℕ)) |
9 | 8 | imbi2d 344 | . . 3 ⊢ (𝑥 = (𝑦 + 1) → ((𝐴 ∈ ℕ → (𝐴 · 𝑥) ∈ ℕ) ↔ (𝐴 ∈ ℕ → (𝐴 · (𝑦 + 1)) ∈ ℕ))) |
10 | oveq2 7143 | . . . . 5 ⊢ (𝑥 = 𝐵 → (𝐴 · 𝑥) = (𝐴 · 𝐵)) | |
11 | 10 | eleq1d 2874 | . . . 4 ⊢ (𝑥 = 𝐵 → ((𝐴 · 𝑥) ∈ ℕ ↔ (𝐴 · 𝐵) ∈ ℕ)) |
12 | 11 | imbi2d 344 | . . 3 ⊢ (𝑥 = 𝐵 → ((𝐴 ∈ ℕ → (𝐴 · 𝑥) ∈ ℕ) ↔ (𝐴 ∈ ℕ → (𝐴 · 𝐵) ∈ ℕ))) |
13 | nnre 11632 | . . . 4 ⊢ (𝐴 ∈ ℕ → 𝐴 ∈ ℝ) | |
14 | ax-1rid 10596 | . . . . . 6 ⊢ (𝐴 ∈ ℝ → (𝐴 · 1) = 𝐴) | |
15 | 14 | eleq1d 2874 | . . . . 5 ⊢ (𝐴 ∈ ℝ → ((𝐴 · 1) ∈ ℕ ↔ 𝐴 ∈ ℕ)) |
16 | 15 | biimprd 251 | . . . 4 ⊢ (𝐴 ∈ ℝ → (𝐴 ∈ ℕ → (𝐴 · 1) ∈ ℕ)) |
17 | 13, 16 | mpcom 38 | . . 3 ⊢ (𝐴 ∈ ℕ → (𝐴 · 1) ∈ ℕ) |
18 | nnaddcl 11648 | . . . . . . . 8 ⊢ (((𝐴 · 𝑦) ∈ ℕ ∧ 𝐴 ∈ ℕ) → ((𝐴 · 𝑦) + 𝐴) ∈ ℕ) | |
19 | 18 | ancoms 462 | . . . . . . 7 ⊢ ((𝐴 ∈ ℕ ∧ (𝐴 · 𝑦) ∈ ℕ) → ((𝐴 · 𝑦) + 𝐴) ∈ ℕ) |
20 | nncn 11633 | . . . . . . . . . 10 ⊢ (𝐴 ∈ ℕ → 𝐴 ∈ ℂ) | |
21 | nncn 11633 | . . . . . . . . . 10 ⊢ (𝑦 ∈ ℕ → 𝑦 ∈ ℂ) | |
22 | ax-1cn 10584 | . . . . . . . . . . 11 ⊢ 1 ∈ ℂ | |
23 | adddi 10615 | . . . . . . . . . . 11 ⊢ ((𝐴 ∈ ℂ ∧ 𝑦 ∈ ℂ ∧ 1 ∈ ℂ) → (𝐴 · (𝑦 + 1)) = ((𝐴 · 𝑦) + (𝐴 · 1))) | |
24 | 22, 23 | mp3an3 1447 | . . . . . . . . . 10 ⊢ ((𝐴 ∈ ℂ ∧ 𝑦 ∈ ℂ) → (𝐴 · (𝑦 + 1)) = ((𝐴 · 𝑦) + (𝐴 · 1))) |
25 | 20, 21, 24 | syl2an 598 | . . . . . . . . 9 ⊢ ((𝐴 ∈ ℕ ∧ 𝑦 ∈ ℕ) → (𝐴 · (𝑦 + 1)) = ((𝐴 · 𝑦) + (𝐴 · 1))) |
26 | 13, 14 | syl 17 | . . . . . . . . . . 11 ⊢ (𝐴 ∈ ℕ → (𝐴 · 1) = 𝐴) |
27 | 26 | adantr 484 | . . . . . . . . . 10 ⊢ ((𝐴 ∈ ℕ ∧ 𝑦 ∈ ℕ) → (𝐴 · 1) = 𝐴) |
28 | 27 | oveq2d 7151 | . . . . . . . . 9 ⊢ ((𝐴 ∈ ℕ ∧ 𝑦 ∈ ℕ) → ((𝐴 · 𝑦) + (𝐴 · 1)) = ((𝐴 · 𝑦) + 𝐴)) |
29 | 25, 28 | eqtrd 2833 | . . . . . . . 8 ⊢ ((𝐴 ∈ ℕ ∧ 𝑦 ∈ ℕ) → (𝐴 · (𝑦 + 1)) = ((𝐴 · 𝑦) + 𝐴)) |
30 | 29 | eleq1d 2874 | . . . . . . 7 ⊢ ((𝐴 ∈ ℕ ∧ 𝑦 ∈ ℕ) → ((𝐴 · (𝑦 + 1)) ∈ ℕ ↔ ((𝐴 · 𝑦) + 𝐴) ∈ ℕ)) |
31 | 19, 30 | syl5ibr 249 | . . . . . 6 ⊢ ((𝐴 ∈ ℕ ∧ 𝑦 ∈ ℕ) → ((𝐴 ∈ ℕ ∧ (𝐴 · 𝑦) ∈ ℕ) → (𝐴 · (𝑦 + 1)) ∈ ℕ)) |
32 | 31 | exp4b 434 | . . . . 5 ⊢ (𝐴 ∈ ℕ → (𝑦 ∈ ℕ → (𝐴 ∈ ℕ → ((𝐴 · 𝑦) ∈ ℕ → (𝐴 · (𝑦 + 1)) ∈ ℕ)))) |
33 | 32 | pm2.43b 55 | . . . 4 ⊢ (𝑦 ∈ ℕ → (𝐴 ∈ ℕ → ((𝐴 · 𝑦) ∈ ℕ → (𝐴 · (𝑦 + 1)) ∈ ℕ))) |
34 | 33 | a2d 29 | . . 3 ⊢ (𝑦 ∈ ℕ → ((𝐴 ∈ ℕ → (𝐴 · 𝑦) ∈ ℕ) → (𝐴 ∈ ℕ → (𝐴 · (𝑦 + 1)) ∈ ℕ))) |
35 | 3, 6, 9, 12, 17, 34 | nnind 11643 | . 2 ⊢ (𝐵 ∈ ℕ → (𝐴 ∈ ℕ → (𝐴 · 𝐵) ∈ ℕ)) |
36 | 35 | impcom 411 | 1 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ) → (𝐴 · 𝐵) ∈ ℕ) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 399 = wceq 1538 ∈ wcel 2111 (class class class)co 7135 ℂcc 10524 ℝcr 10525 1c1 10527 + caddc 10529 · cmul 10531 ℕcn 11625 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2113 ax-9 2121 ax-10 2142 ax-11 2158 ax-12 2175 ax-ext 2770 ax-sep 5167 ax-nul 5174 ax-pow 5231 ax-pr 5295 ax-un 7441 ax-1cn 10584 ax-icn 10585 ax-addcl 10586 ax-addrcl 10587 ax-mulcl 10588 ax-mulrcl 10589 ax-addass 10591 ax-distr 10593 ax-i2m1 10594 ax-1ne0 10595 ax-1rid 10596 ax-rrecex 10598 ax-cnre 10599 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 845 df-3or 1085 df-3an 1086 df-tru 1541 df-ex 1782 df-nf 1786 df-sb 2070 df-mo 2598 df-eu 2629 df-clab 2777 df-cleq 2791 df-clel 2870 df-nfc 2938 df-ne 2988 df-ral 3111 df-rex 3112 df-reu 3113 df-rab 3115 df-v 3443 df-sbc 3721 df-csb 3829 df-dif 3884 df-un 3886 df-in 3888 df-ss 3898 df-pss 3900 df-nul 4244 df-if 4426 df-pw 4499 df-sn 4526 df-pr 4528 df-tp 4530 df-op 4532 df-uni 4801 df-iun 4883 df-br 5031 df-opab 5093 df-mpt 5111 df-tr 5137 df-id 5425 df-eprel 5430 df-po 5438 df-so 5439 df-fr 5478 df-we 5480 df-xp 5525 df-rel 5526 df-cnv 5527 df-co 5528 df-dm 5529 df-rn 5530 df-res 5531 df-ima 5532 df-pred 6116 df-ord 6162 df-on 6163 df-lim 6164 df-suc 6165 df-iota 6283 df-fun 6326 df-fn 6327 df-f 6328 df-f1 6329 df-fo 6330 df-f1o 6331 df-fv 6332 df-ov 7138 df-om 7561 df-wrecs 7930 df-recs 7991 df-rdg 8029 df-nn 11626 |
This theorem is referenced by: nnmulcli 11650 nnmtmip 11651 nndivtr 11672 nnmulcld 11678 nn0mulcl 11921 qaddcl 12352 qmulcl 12354 modmulnn 13252 nnexpcl 13438 nnsqcl 13489 expmulnbnd 13592 faccl 13639 facdiv 13643 faclbnd3 13648 faclbnd4lem3 13651 faclbnd5 13654 bcrpcl 13664 trirecip 15210 fprodnncl 15301 nnrisefaccl 15365 lcmgcdlem 15940 lcmgcdnn 15945 pcmptcl 16217 prmreclem1 16242 prmreclem6 16247 4sqlem12 16282 vdwlem3 16309 vdwlem9 16315 vdwlem10 16316 mulgnnass 18254 ovolunlem1a 24100 ovolunlem1 24101 mbfi1fseqlem3 24321 mbfi1fseqlem4 24322 elqaalem2 24916 elqaalem3 24917 log2cnv 25530 log2tlbnd 25531 log2ublem2 25533 log2ub 25535 basellem1 25666 basellem2 25667 basellem3 25668 basellem4 25669 basellem5 25670 basellem6 25671 basellem7 25672 basellem8 25673 basellem9 25674 efnnfsumcl 25688 efchtdvds 25744 mumullem1 25764 mumullem2 25765 fsumdvdscom 25770 dvdsflf1o 25772 chtublem 25795 pcbcctr 25860 bclbnd 25864 bposlem1 25868 bposlem2 25869 bposlem3 25870 bposlem4 25871 bposlem5 25872 bposlem6 25873 lgseisenlem1 25959 lgseisenlem2 25960 lgseisenlem3 25961 lgseisenlem4 25962 lgsquadlem1 25964 lgsquadlem2 25965 chebbnd1lem1 26053 chebbnd1lem3 26055 dchrisumlem1 26073 mulogsum 26116 pntrsumo1 26149 pntrsumbnd 26150 ostth2lem1 26202 subfaclim 32548 jm2.17a 39901 jm2.17b 39902 jm2.17c 39903 acongrep 39921 acongeq 39924 jm2.27a 39946 jm2.27c 39948 |
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