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| Mirrors > Home > ILE Home > Th. List > mulpiord | GIF version | ||
| Description: Positive integer multiplication in terms of ordinal multiplication. (Contributed by NM, 27-Aug-1995.) |
| Ref | Expression |
|---|---|
| mulpiord | ⊢ ((𝐴 ∈ N ∧ 𝐵 ∈ N) → (𝐴 ·N 𝐵) = (𝐴 ·o 𝐵)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | opelxpi 4806 | . 2 ⊢ ((𝐴 ∈ N ∧ 𝐵 ∈ N) → 〈𝐴, 𝐵〉 ∈ (N × N)) | |
| 2 | fvres 5719 | . . 3 ⊢ (〈𝐴, 𝐵〉 ∈ (N × N) → (( ·o ↾ (N × N))‘〈𝐴, 𝐵〉) = ( ·o ‘〈𝐴, 𝐵〉)) | |
| 3 | df-ov 6088 | . . . 4 ⊢ (𝐴 ·N 𝐵) = ( ·N ‘〈𝐴, 𝐵〉) | |
| 4 | df-mi 7673 | . . . . 5 ⊢ ·N = ( ·o ↾ (N × N)) | |
| 5 | 4 | fveq1i 5696 | . . . 4 ⊢ ( ·N ‘〈𝐴, 𝐵〉) = (( ·o ↾ (N × N))‘〈𝐴, 𝐵〉) |
| 6 | 3, 5 | eqtri 2259 | . . 3 ⊢ (𝐴 ·N 𝐵) = (( ·o ↾ (N × N))‘〈𝐴, 𝐵〉) |
| 7 | df-ov 6088 | . . 3 ⊢ (𝐴 ·o 𝐵) = ( ·o ‘〈𝐴, 𝐵〉) | |
| 8 | 2, 6, 7 | 3eqtr4g 2296 | . 2 ⊢ (〈𝐴, 𝐵〉 ∈ (N × N) → (𝐴 ·N 𝐵) = (𝐴 ·o 𝐵)) |
| 9 | 1, 8 | syl 14 | 1 ⊢ ((𝐴 ∈ N ∧ 𝐵 ∈ N) → (𝐴 ·N 𝐵) = (𝐴 ·o 𝐵)) |
| Colors of variables: wff set class |
| This proof depends on syntax axioms: → wi 4 ∧ wa 104 = wceq 1402 ∈ wcel 2209 〈cop 3712 × cxp 4772 ↾ cres 4776 ‘cfv 5377 (class class class)co 6085 ·o comu 6685 Ncnpi 7639 ·N cmi 7641 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-io 721 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-10 1558 ax-11 1559 ax-i12 1560 ax-bndl 1562 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-14 2212 ax-ext 2220 ax-sep 4249 ax-pow 4311 ax-pr 4346 |
| This proof depends on definitions: df-bi 117 df-3an 1011 df-tru 1405 df-nf 1514 df-sb 1816 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-ral 2533 df-rex 2534 df-v 2823 df-un 3224 df-in 3226 df-ss 3233 df-pw 3690 df-sn 3715 df-pr 3716 df-op 3718 df-uni 3936 df-br 4131 df-opab 4193 df-xp 4780 df-res 4786 df-iota 5337 df-fv 5385 df-ov 6088 df-mi 7673 |
| This theorem is used by: mulidpi 7685 mulclpi 7695 mulcompig 7698 mulasspig 7699 distrpig 7700 mulcanpig 7702 ltmpig 7706 archnqq 7784 enq0enq 7798 addcmpblnq0 7810 mulcmpblnq0 7811 mulcanenq0ec 7812 addclnq0 7818 mulclnq0 7819 nqpnq0nq 7820 nqnq0a 7821 nqnq0m 7822 nq0m0r 7823 distrnq0 7826 addassnq0lemcl 7828 |
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