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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 10964 | . . . 4 ⊢ (𝐴 ∈ N → 𝐴 ∈ ω) | |
| 2 | pinn 10964 | . . . 4 ⊢ (𝐵 ∈ N → 𝐵 ∈ ω) | |
| 3 | nnmcom 8636 | . . . 4 ⊢ ((𝐴 ∈ ω ∧ 𝐵 ∈ ω) → (𝐴 ·o 𝐵) = (𝐵 ·o 𝐴)) | |
| 4 | 1, 2, 3 | syl2an 608 | . . 3 ⊢ ((𝐴 ∈ N ∧ 𝐵 ∈ N) → (𝐴 ·o 𝐵) = (𝐵 ·o 𝐴)) |
| 5 | mulpiord 10971 | . . 3 ⊢ ((𝐴 ∈ N ∧ 𝐵 ∈ N) → (𝐴 ·N 𝐵) = (𝐴 ·o 𝐵)) | |
| 6 | mulpiord 10971 | . . . 4 ⊢ ((𝐵 ∈ N ∧ 𝐴 ∈ N) → (𝐵 ·N 𝐴) = (𝐵 ·o 𝐴)) | |
| 7 | 6 | ancoms 464 | . . 3 ⊢ ((𝐴 ∈ N ∧ 𝐵 ∈ N) → (𝐵 ·N 𝐴) = (𝐵 ·o 𝐴)) |
| 8 | 4, 5, 7 | 3eqtr4d 2805 | . 2 ⊢ ((𝐴 ∈ N ∧ 𝐵 ∈ N) → (𝐴 ·N 𝐵) = (𝐵 ·N 𝐴)) |
| 9 | dmmulpi 10977 | . . 3 ⊢ dom ·N = (N × N) | |
| 10 | 9 | ndmovcom 7608 | . 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 |
| This proof depends on syntax axioms: ∧ wa 401 = wceq 1569 ∈ wcel 2144 (class class class)co 7420 ωcom 7877 ·o comu 8475 Ncnpi 10930 ·N cmi 10932 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1942 ax-6 1999 ax-7 2040 ax-8 2146 ax-9 2154 ax-10 2177 ax-11 2193 ax-12 2212 ax-ext 2732 ax-sep 5248 ax-nul 5259 ax-pr 5390 ax-un 7751 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1572 df-fal 1582 df-ex 1812 df-nf 1816 df-sb 2099 df-mo 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 df-ne 2956 df-ral 3077 df-rex 3087 df-reu 3366 df-rab 3413 df-v 3452 df-sbc 3739 df-csb 3847 df-ss 3896 df-pss 4014 df-dif 4047 df-in 4091 df-un 4151 df-nul 4279 df-if 4482 df-pw 4558 df-sn 4584 df-pr 4586 df-op 4590 df-uni 4867 df-iun 4952 df-br 5103 df-opab 5167 df-mpt 5186 df-tr 5212 df-id 5545 df-eprel 5550 df-po 5558 df-so 5559 df-fr 5603 df-we 5605 df-xp 5656 df-rel 5657 df-cnv 5658 df-co 5659 df-dm 5660 df-rn 5661 df-res 5662 df-ima 5663 df-pred 6304 df-ord 6365 df-on 6366 df-lim 6367 df-suc 6368 df-iota 6494 df-fun 6540 df-fn 6541 df-f 6542 df-f1 6543 df-fo 6544 df-f1o 6545 df-fv 6546 df-ov 7423 df-oprab 7424 df-mpo 7425 df-om 7878 df-1st 8001 df-2nd 8002 df-frecs 8300 df-wrecs 8331 df-recs 8380 df-rdg 8419 df-oadd 8481 df-omul 8482 df-ni 10958 df-mi 10960 |
| This theorem is used by: enqbreq2 11006 enqer 11007 nqereu 11015 addcompq 11036 mulcompq 11038 adderpqlem 11040 mulerpqlem 11041 addassnq 11044 mulcanenq 11046 distrnq 11047 recmulnq 11050 ltsonq 11055 lterpq 11056 ltanq 11057 ltmnq 11058 ltexnq 11061 |
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