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| Mirrors > Home > MPE Home > Th. List > mulcompi | Structured version Visualization version GIF version | ||
| Description: Multiplication of positive integers is commutative. (Contributed by NM, 21-Sep-1995.) (New usage is discouraged.) |
| Ref | Expression |
|---|---|
| mulcompi | ⊢ (𝐴 ·N 𝐵) = (𝐵 ·N 𝐴) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | pinn 10851 | . . . 4 ⊢ (𝐴 ∈ N → 𝐴 ∈ ω) | |
| 2 | pinn 10851 | . . . 4 ⊢ (𝐵 ∈ N → 𝐵 ∈ ω) | |
| 3 | nnmcom 8600 | . . . 4 ⊢ ((𝐴 ∈ ω ∧ 𝐵 ∈ ω) → (𝐴 ·o 𝐵) = (𝐵 ·o 𝐴)) | |
| 4 | 1, 2, 3 | syl2an 607 | . . 3 ⊢ ((𝐴 ∈ N ∧ 𝐵 ∈ N) → (𝐴 ·o 𝐵) = (𝐵 ·o 𝐴)) |
| 5 | mulpiord 10858 | . . 3 ⊢ ((𝐴 ∈ N ∧ 𝐵 ∈ N) → (𝐴 ·N 𝐵) = (𝐴 ·o 𝐵)) | |
| 6 | mulpiord 10858 | . . . 4 ⊢ ((𝐵 ∈ N ∧ 𝐴 ∈ N) → (𝐵 ·N 𝐴) = (𝐵 ·o 𝐴)) | |
| 7 | 6 | ancoms 463 | . . 3 ⊢ ((𝐴 ∈ N ∧ 𝐵 ∈ N) → (𝐵 ·N 𝐴) = (𝐵 ·o 𝐴)) |
| 8 | 4, 5, 7 | 3eqtr4d 2810 | . 2 ⊢ ((𝐴 ∈ N ∧ 𝐵 ∈ N) → (𝐴 ·N 𝐵) = (𝐵 ·N 𝐴)) |
| 9 | dmmulpi 10864 | . . 3 ⊢ dom ·N = (N × N) | |
| 10 | 9 | ndmovcom 7587 | . 2 ⊢ (¬ (𝐴 ∈ N ∧ 𝐵 ∈ N) → (𝐴 ·N 𝐵) = (𝐵 ·N 𝐴)) |
| 11 | 8, 10 | pm2.61i 184 | 1 ⊢ (𝐴 ·N 𝐵) = (𝐵 ·N 𝐴) |
| Colors of variables: wff setvar class |
| Syntax hints: ∧ wa 400 = wceq 1563 ∈ wcel 2145 (class class class)co 7400 ωcom 7850 ·o comu 8439 Ncnpi 10817 ·N cmi 10819 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1818 ax-4 1832 ax-5 1933 ax-6 1990 ax-7 2031 ax-8 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2215 ax-ext 2737 ax-sep 5251 ax-nul 5261 ax-pr 5395 ax-un 7722 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3or 1102 df-3an 1103 df-tru 1566 df-fal 1576 df-ex 1803 df-nf 1807 df-sb 2094 df-mo 2569 df-eu 2599 df-clab 2744 df-cleq 2757 df-clel 2840 df-nfc 2914 df-ne 2961 df-ral 3080 df-rex 3090 df-reu 3371 df-rab 3418 df-v 3459 df-sbc 3748 df-csb 3856 df-dif 3910 df-un 3912 df-in 3914 df-ss 3924 df-pss 3927 df-nul 4289 df-if 4484 df-pw 4560 df-sn 4586 df-pr 4588 df-op 4592 df-uni 4869 df-iun 4954 df-br 5106 df-opab 5168 df-mpt 5187 df-tr 5213 df-id 5547 df-eprel 5552 df-po 5560 df-so 5561 df-fr 5605 df-we 5607 df-xp 5658 df-rel 5659 df-cnv 5660 df-co 5661 df-dm 5662 df-rn 5663 df-res 5664 df-ima 5665 df-pred 6292 df-ord 6353 df-on 6354 df-lim 6355 df-suc 6356 df-iota 6481 df-fun 6527 df-fn 6528 df-f 6529 df-f1 6530 df-fo 6531 df-f1o 6532 df-fv 6533 df-ov 7403 df-oprab 7404 df-mpo 7405 df-om 7851 df-1st 7974 df-2nd 7975 df-frecs 8266 df-wrecs 8297 df-recs 8346 df-rdg 8385 df-oadd 8445 df-omul 8446 df-ni 10845 df-mi 10847 |
| This theorem is referenced by: enqbreq2 10893 enqer 10894 nqereu 10902 addcompq 10923 mulcompq 10925 adderpqlem 10927 mulerpqlem 10928 addassnq 10931 mulcanenq 10933 distrnq 10934 recmulnq 10937 ltsonq 10942 lterpq 10943 ltanq 10944 ltmnq 10945 ltexnq 10948 |
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