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Theorem mulasspig 7273
Description: Multiplication of positive integers is associative. (Contributed by Jim Kingdon, 26-Aug-2019.)
Assertion
Ref Expression
mulasspig ((𝐴N𝐵N𝐶N) → ((𝐴 ·N 𝐵) ·N 𝐶) = (𝐴 ·N (𝐵 ·N 𝐶)))

Proof of Theorem mulasspig
StepHypRef Expression
1 pinn 7250 . . 3 (𝐴N𝐴 ∈ ω)
2 pinn 7250 . . 3 (𝐵N𝐵 ∈ ω)
3 pinn 7250 . . 3 (𝐶N𝐶 ∈ ω)
4 nnmass 6455 . . 3 ((𝐴 ∈ ω ∧ 𝐵 ∈ ω ∧ 𝐶 ∈ ω) → ((𝐴 ·o 𝐵) ·o 𝐶) = (𝐴 ·o (𝐵 ·o 𝐶)))
51, 2, 3, 4syl3an 1270 . 2 ((𝐴N𝐵N𝐶N) → ((𝐴 ·o 𝐵) ·o 𝐶) = (𝐴 ·o (𝐵 ·o 𝐶)))
6 mulclpi 7269 . . . . 5 ((𝐴N𝐵N) → (𝐴 ·N 𝐵) ∈ N)
7 mulpiord 7258 . . . . 5 (((𝐴 ·N 𝐵) ∈ N𝐶N) → ((𝐴 ·N 𝐵) ·N 𝐶) = ((𝐴 ·N 𝐵) ·o 𝐶))
86, 7sylan 281 . . . 4 (((𝐴N𝐵N) ∧ 𝐶N) → ((𝐴 ·N 𝐵) ·N 𝐶) = ((𝐴 ·N 𝐵) ·o 𝐶))
9 mulpiord 7258 . . . . . 6 ((𝐴N𝐵N) → (𝐴 ·N 𝐵) = (𝐴 ·o 𝐵))
109oveq1d 5857 . . . . 5 ((𝐴N𝐵N) → ((𝐴 ·N 𝐵) ·o 𝐶) = ((𝐴 ·o 𝐵) ·o 𝐶))
1110adantr 274 . . . 4 (((𝐴N𝐵N) ∧ 𝐶N) → ((𝐴 ·N 𝐵) ·o 𝐶) = ((𝐴 ·o 𝐵) ·o 𝐶))
128, 11eqtrd 2198 . . 3 (((𝐴N𝐵N) ∧ 𝐶N) → ((𝐴 ·N 𝐵) ·N 𝐶) = ((𝐴 ·o 𝐵) ·o 𝐶))
13123impa 1184 . 2 ((𝐴N𝐵N𝐶N) → ((𝐴 ·N 𝐵) ·N 𝐶) = ((𝐴 ·o 𝐵) ·o 𝐶))
14 mulclpi 7269 . . . . 5 ((𝐵N𝐶N) → (𝐵 ·N 𝐶) ∈ N)
15 mulpiord 7258 . . . . 5 ((𝐴N ∧ (𝐵 ·N 𝐶) ∈ N) → (𝐴 ·N (𝐵 ·N 𝐶)) = (𝐴 ·o (𝐵 ·N 𝐶)))
1614, 15sylan2 284 . . . 4 ((𝐴N ∧ (𝐵N𝐶N)) → (𝐴 ·N (𝐵 ·N 𝐶)) = (𝐴 ·o (𝐵 ·N 𝐶)))
17 mulpiord 7258 . . . . . 6 ((𝐵N𝐶N) → (𝐵 ·N 𝐶) = (𝐵 ·o 𝐶))
1817oveq2d 5858 . . . . 5 ((𝐵N𝐶N) → (𝐴 ·o (𝐵 ·N 𝐶)) = (𝐴 ·o (𝐵 ·o 𝐶)))
1918adantl 275 . . . 4 ((𝐴N ∧ (𝐵N𝐶N)) → (𝐴 ·o (𝐵 ·N 𝐶)) = (𝐴 ·o (𝐵 ·o 𝐶)))
2016, 19eqtrd 2198 . . 3 ((𝐴N ∧ (𝐵N𝐶N)) → (𝐴 ·N (𝐵 ·N 𝐶)) = (𝐴 ·o (𝐵 ·o 𝐶)))
21203impb 1189 . 2 ((𝐴N𝐵N𝐶N) → (𝐴 ·N (𝐵 ·N 𝐶)) = (𝐴 ·o (𝐵 ·o 𝐶)))
225, 13, 213eqtr4d 2208 1 ((𝐴N𝐵N𝐶N) → ((𝐴 ·N 𝐵) ·N 𝐶) = (𝐴 ·N (𝐵 ·N 𝐶)))
Colors of variables: wff set class
Syntax hints:  wi 4  wa 103  w3a 968   = wceq 1343  wcel 2136  ωcom 4567  (class class class)co 5842   ·o comu 6382  Ncnpi 7213   ·N cmi 7215
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-in1 604  ax-in2 605  ax-io 699  ax-5 1435  ax-7 1436  ax-gen 1437  ax-ie1 1481  ax-ie2 1482  ax-8 1492  ax-10 1493  ax-11 1494  ax-i12 1495  ax-bndl 1497  ax-4 1498  ax-17 1514  ax-i9 1518  ax-ial 1522  ax-i5r 1523  ax-13 2138  ax-14 2139  ax-ext 2147  ax-coll 4097  ax-sep 4100  ax-nul 4108  ax-pow 4153  ax-pr 4187  ax-un 4411  ax-setind 4514  ax-iinf 4565
This theorem depends on definitions:  df-bi 116  df-dc 825  df-3an 970  df-tru 1346  df-fal 1349  df-nf 1449  df-sb 1751  df-eu 2017  df-mo 2018  df-clab 2152  df-cleq 2158  df-clel 2161  df-nfc 2297  df-ne 2337  df-ral 2449  df-rex 2450  df-reu 2451  df-rab 2453  df-v 2728  df-sbc 2952  df-csb 3046  df-dif 3118  df-un 3120  df-in 3122  df-ss 3129  df-nul 3410  df-pw 3561  df-sn 3582  df-pr 3583  df-op 3585  df-uni 3790  df-int 3825  df-iun 3868  df-br 3983  df-opab 4044  df-mpt 4045  df-tr 4081  df-id 4271  df-iord 4344  df-on 4346  df-suc 4349  df-iom 4568  df-xp 4610  df-rel 4611  df-cnv 4612  df-co 4613  df-dm 4614  df-rn 4615  df-res 4616  df-ima 4617  df-iota 5153  df-fun 5190  df-fn 5191  df-f 5192  df-f1 5193  df-fo 5194  df-f1o 5195  df-fv 5196  df-ov 5845  df-oprab 5846  df-mpo 5847  df-1st 6108  df-2nd 6109  df-recs 6273  df-irdg 6338  df-oadd 6388  df-omul 6389  df-ni 7245  df-mi 7247
This theorem is referenced by:  enqer  7299  addcmpblnq  7308  mulcmpblnq  7309  ordpipqqs  7315  addassnqg  7323  mulassnqg  7325  mulcanenq  7326  distrnqg  7328  ltsonq  7339  ltanqg  7341  ltmnqg  7342  ltexnqq  7349
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