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Theorem addpiord 7535
Description: Positive integer addition in terms of ordinal addition. (Contributed by NM, 27-Aug-1995.)
Assertion
Ref Expression
addpiord  |-  ( ( A  e.  N.  /\  B  e.  N. )  ->  ( A  +N  B
)  =  ( A  +o  B ) )

Proof of Theorem addpiord
StepHypRef Expression
1 opelxpi 4757 . 2  |-  ( ( A  e.  N.  /\  B  e.  N. )  -> 
<. A ,  B >.  e.  ( N.  X.  N. ) )
2 fvres 5663 . . 3  |-  ( <. A ,  B >.  e.  ( N.  X.  N. )  ->  ( (  +o  |`  ( N.  X.  N. ) ) `  <. A ,  B >. )  =  (  +o  `  <. A ,  B >. )
)
3 df-ov 6020 . . . 4  |-  ( A  +N  B )  =  (  +N  `  <. A ,  B >. )
4 df-pli 7524 . . . . 5  |-  +N  =  (  +o  |`  ( N.  X.  N. ) )
54fveq1i 5640 . . . 4  |-  (  +N 
`  <. A ,  B >. )  =  ( (  +o  |`  ( N.  X.  N. ) ) `  <. A ,  B >. )
63, 5eqtri 2252 . . 3  |-  ( A  +N  B )  =  ( (  +o  |`  ( N.  X.  N. ) ) `
 <. A ,  B >. )
7 df-ov 6020 . . 3  |-  ( A  +o  B )  =  (  +o  `  <. A ,  B >. )
82, 6, 73eqtr4g 2289 . 2  |-  ( <. A ,  B >.  e.  ( N.  X.  N. )  ->  ( A  +N  B )  =  ( A  +o  B ) )
91, 8syl 14 1  |-  ( ( A  e.  N.  /\  B  e.  N. )  ->  ( A  +N  B
)  =  ( A  +o  B ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 104    = wceq 1397    e. wcel 2202   <.cop 3672    X. cxp 4723    |` cres 4727   ` cfv 5326  (class class class)co 6017    +o coa 6578   N.cnpi 7491    +N cpli 7492
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 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-14 2205  ax-ext 2213  ax-sep 4207  ax-pow 4264  ax-pr 4299
This theorem depends on definitions:  df-bi 117  df-3an 1006  df-tru 1400  df-nf 1509  df-sb 1811  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2363  df-ral 2515  df-rex 2516  df-v 2804  df-un 3204  df-in 3206  df-ss 3213  df-pw 3654  df-sn 3675  df-pr 3676  df-op 3678  df-uni 3894  df-br 4089  df-opab 4151  df-xp 4731  df-res 4737  df-iota 5286  df-fv 5334  df-ov 6020  df-pli 7524
This theorem is referenced by:  addclpi  7546  addcompig  7548  addasspig  7549  distrpig  7552  addcanpig  7553  addnidpig  7555  ltexpi  7556  ltapig  7557  1lt2pi  7559  indpi  7561  archnqq  7636  prarloclemarch2  7638  nqnq0a  7673
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