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Theorem mulpiord 7316
Description: Positive integer multiplication in terms of ordinal multiplication. (Contributed by NM, 27-Aug-1995.)
Assertion
Ref Expression
mulpiord ((𝐴N𝐵N) → (𝐴 ·N 𝐵) = (𝐴 ·o 𝐵))

Proof of Theorem mulpiord
StepHypRef Expression
1 opelxpi 4659 . 2 ((𝐴N𝐵N) → ⟨𝐴, 𝐵⟩ ∈ (N × N))
2 fvres 5540 . . 3 (⟨𝐴, 𝐵⟩ ∈ (N × N) → (( ·o ↾ (N × N))‘⟨𝐴, 𝐵⟩) = ( ·o ‘⟨𝐴, 𝐵⟩))
3 df-ov 5878 . . . 4 (𝐴 ·N 𝐵) = ( ·N ‘⟨𝐴, 𝐵⟩)
4 df-mi 7305 . . . . 5 ·N = ( ·o ↾ (N × N))
54fveq1i 5517 . . . 4 ( ·N ‘⟨𝐴, 𝐵⟩) = (( ·o ↾ (N × N))‘⟨𝐴, 𝐵⟩)
63, 5eqtri 2198 . . 3 (𝐴 ·N 𝐵) = (( ·o ↾ (N × N))‘⟨𝐴, 𝐵⟩)
7 df-ov 5878 . . 3 (𝐴 ·o 𝐵) = ( ·o ‘⟨𝐴, 𝐵⟩)
82, 6, 73eqtr4g 2235 . 2 (⟨𝐴, 𝐵⟩ ∈ (N × N) → (𝐴 ·N 𝐵) = (𝐴 ·o 𝐵))
91, 8syl 14 1 ((𝐴N𝐵N) → (𝐴 ·N 𝐵) = (𝐴 ·o 𝐵))
Colors of variables: wff set class
Syntax hints:  wi 4  wa 104   = wceq 1353  wcel 2148  cop 3596   × cxp 4625  cres 4629  cfv 5217  (class class class)co 5875   ·o comu 6415  Ncnpi 7271   ·N cmi 7273
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-io 709  ax-5 1447  ax-7 1448  ax-gen 1449  ax-ie1 1493  ax-ie2 1494  ax-8 1504  ax-10 1505  ax-11 1506  ax-i12 1507  ax-bndl 1509  ax-4 1510  ax-17 1526  ax-i9 1530  ax-ial 1534  ax-i5r 1535  ax-14 2151  ax-ext 2159  ax-sep 4122  ax-pow 4175  ax-pr 4210
This theorem depends on definitions:  df-bi 117  df-3an 980  df-tru 1356  df-nf 1461  df-sb 1763  df-clab 2164  df-cleq 2170  df-clel 2173  df-nfc 2308  df-ral 2460  df-rex 2461  df-v 2740  df-un 3134  df-in 3136  df-ss 3143  df-pw 3578  df-sn 3599  df-pr 3600  df-op 3602  df-uni 3811  df-br 4005  df-opab 4066  df-xp 4633  df-res 4639  df-iota 5179  df-fv 5225  df-ov 5878  df-mi 7305
This theorem is referenced by:  mulidpi  7317  mulclpi  7327  mulcompig  7330  mulasspig  7331  distrpig  7332  mulcanpig  7334  ltmpig  7338  archnqq  7416  enq0enq  7430  addcmpblnq0  7442  mulcmpblnq0  7443  mulcanenq0ec  7444  addclnq0  7450  mulclnq0  7451  nqpnq0nq  7452  nqnq0a  7453  nqnq0m  7454  nq0m0r  7455  distrnq0  7458  addassnq0lemcl  7460
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