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| Mirrors > Home > ILE Home > Th. List > mulcompig | GIF version | ||
| Description: Multiplication of positive integers is commutative. (Contributed by Jim Kingdon, 26-Aug-2019.) |
| Ref | Expression |
|---|---|
| mulcompig | ⊢ ((𝐴 ∈ N ∧ 𝐵 ∈ N) → (𝐴 ·N 𝐵) = (𝐵 ·N 𝐴)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | pinn 7529 | . . 3 ⊢ (𝐴 ∈ N → 𝐴 ∈ ω) | |
| 2 | pinn 7529 | . . 3 ⊢ (𝐵 ∈ N → 𝐵 ∈ ω) | |
| 3 | nnmcom 6657 | . . 3 ⊢ ((𝐴 ∈ ω ∧ 𝐵 ∈ ω) → (𝐴 ·o 𝐵) = (𝐵 ·o 𝐴)) | |
| 4 | 1, 2, 3 | syl2an 289 | . 2 ⊢ ((𝐴 ∈ N ∧ 𝐵 ∈ N) → (𝐴 ·o 𝐵) = (𝐵 ·o 𝐴)) |
| 5 | mulpiord 7537 | . 2 ⊢ ((𝐴 ∈ N ∧ 𝐵 ∈ N) → (𝐴 ·N 𝐵) = (𝐴 ·o 𝐵)) | |
| 6 | mulpiord 7537 | . . 3 ⊢ ((𝐵 ∈ N ∧ 𝐴 ∈ N) → (𝐵 ·N 𝐴) = (𝐵 ·o 𝐴)) | |
| 7 | 6 | ancoms 268 | . 2 ⊢ ((𝐴 ∈ N ∧ 𝐵 ∈ N) → (𝐵 ·N 𝐴) = (𝐵 ·o 𝐴)) |
| 8 | 4, 5, 7 | 3eqtr4d 2274 | 1 ⊢ ((𝐴 ∈ N ∧ 𝐵 ∈ N) → (𝐴 ·N 𝐵) = (𝐵 ·N 𝐴)) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∧ wa 104 = wceq 1397 ∈ wcel 2202 ωcom 4688 (class class class)co 6018 ·o comu 6580 Ncnpi 7492 ·N cmi 7494 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 619 ax-in2 620 ax-io 716 ax-5 1495 ax-7 1496 ax-gen 1497 ax-ie1 1541 ax-ie2 1542 ax-8 1552 ax-10 1553 ax-11 1554 ax-i12 1555 ax-bndl 1557 ax-4 1558 ax-17 1574 ax-i9 1578 ax-ial 1582 ax-i5r 1583 ax-13 2204 ax-14 2205 ax-ext 2213 ax-coll 4204 ax-sep 4207 ax-nul 4215 ax-pow 4264 ax-pr 4299 ax-un 4530 ax-setind 4635 ax-iinf 4686 |
| This theorem depends on definitions: df-bi 117 df-3an 1006 df-tru 1400 df-fal 1403 df-nf 1509 df-sb 1811 df-eu 2082 df-mo 2083 df-clab 2218 df-cleq 2224 df-clel 2227 df-nfc 2363 df-ne 2403 df-ral 2515 df-rex 2516 df-reu 2517 df-rab 2519 df-v 2804 df-sbc 3032 df-csb 3128 df-dif 3202 df-un 3204 df-in 3206 df-ss 3213 df-nul 3495 df-pw 3654 df-sn 3675 df-pr 3676 df-op 3678 df-uni 3894 df-int 3929 df-iun 3972 df-br 4089 df-opab 4151 df-mpt 4152 df-tr 4188 df-id 4390 df-iord 4463 df-on 4465 df-suc 4468 df-iom 4689 df-xp 4731 df-rel 4732 df-cnv 4733 df-co 4734 df-dm 4735 df-rn 4736 df-res 4737 df-ima 4738 df-iota 5286 df-fun 5328 df-fn 5329 df-f 5330 df-f1 5331 df-fo 5332 df-f1o 5333 df-fv 5334 df-ov 6021 df-oprab 6022 df-mpo 6023 df-1st 6303 df-2nd 6304 df-recs 6471 df-irdg 6536 df-oadd 6586 df-omul 6587 df-ni 7524 df-mi 7526 |
| This theorem is referenced by: dfplpq2 7574 enqbreq2 7577 enqer 7578 addcmpblnq 7587 mulcmpblnq 7588 ordpipqqs 7594 addcomnqg 7601 addassnqg 7602 mulcomnqg 7603 mulcanenq 7605 distrnqg 7607 mulidnq 7609 recexnq 7610 nqtri3or 7616 ltsonq 7618 ltanqg 7620 ltmnqg 7621 ltexnqq 7628 archnqq 7637 prarloclemarch2 7639 ltnnnq 7643 prarloclemlt 7713 |
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