ILE Home Intuitionistic Logic Explorer < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  ILE Home  >  Th. List  >  oa0 Unicode version

Theorem oa0 6624
Description: Addition with zero. Proposition 8.3 of [TakeutiZaring] p. 57. (Contributed by NM, 3-May-1995.) (Revised by Mario Carneiro, 8-Sep-2013.)
Assertion
Ref Expression
oa0  |-  ( A  e.  On  ->  ( A  +o  (/) )  =  A )

Proof of Theorem oa0
Dummy variable  x is distinct from all other variables.
StepHypRef Expression
1 0elon 4489 . . 3  |-  (/)  e.  On
2 oav 6621 . . 3  |-  ( ( A  e.  On  /\  (/) 
e.  On )  -> 
( A  +o  (/) )  =  ( rec ( ( x  e.  _V  |->  suc  x ) ,  A
) `  (/) ) )
31, 2mpan2 425 . 2  |-  ( A  e.  On  ->  ( A  +o  (/) )  =  ( rec ( ( x  e.  _V  |->  suc  x
) ,  A ) `
 (/) ) )
4 rdg0g 6553 . 2  |-  ( A  e.  On  ->  ( rec ( ( x  e. 
_V  |->  suc  x ) ,  A ) `  (/) )  =  A )
53, 4eqtrd 2264 1  |-  ( A  e.  On  ->  ( A  +o  (/) )  =  A )
Colors of variables: wff set class
Syntax hints:    -> wi 4    = wceq 1397    e. wcel 2202   _Vcvv 2802   (/)c0 3494    |-> cmpt 4150   Oncon0 4460   suc csuc 4462   ` cfv 5326  (class class class)co 6017   reccrdg 6534    +o coa 6578
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
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-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-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 6020  df-oprab 6021  df-mpo 6022  df-recs 6470  df-irdg 6535  df-oadd 6585
This theorem is referenced by:  oa1suc  6634  oaword1  6638  nna0  6641  nna0r  6645  nnm0r  6646
  Copyright terms: Public domain W3C validator