Theorem dmaddpi 7508

Description: Domain of addition on positive integers. (Contributed by NM, 26-Aug-1995.)

Assertion

Ref	Expression
dmaddpi	|- dom +N = ( N. X. N. )

Proof of Theorem dmaddpi

Step	Hyp	Ref	Expression
1		dmres 5025	. . 3 |- dom ( +o |` ( N. X. N. ) ) = ( ( N. X. N. ) i^i dom +o )
2		fnoa 6591	. . . . 5 |- +o Fn ( On X. On )
3		fndm 5419	. . . . 5 |- ( +o Fn ( On X. On ) -> dom +o = ( On X. On ) )
4	2, 3	ax-mp 5	. . . 4 |- dom +o = ( On X. On )
5	4	ineq2i 3402	. . 3 |- ( ( N. X. N. ) i^i dom +o ) = ( ( N. X. N. ) i^i ( On X. On ) )
6	1, 5	eqtri 2250	. 2 |- dom ( +o |` ( N. X. N. ) ) = ( ( N. X. N. ) i^i ( On X. On ) )
7		df-pli 7488	. . 3 |- +N = ( +o |` ( N. X. N. ) )
8	7	dmeqi 4923	. 2 |- dom +N = dom ( +o |` ( N. X. N. ) )
9		df-ni 7487	. . . . . . 7 |- N. = ( om \ { (/) } )
10		difss 3330	. . . . . . 7 |- ( om \ { (/) } ) C_ om
11	9, 10	eqsstri 3256	. . . . . 6 |- N. C_ om
12		omsson 4704	. . . . . 6 |- om C_ On
13	11, 12	sstri 3233	. . . . 5 |- N. C_ On
14		anidm 396	. . . . 5 |- ( ( N. C_ On /\ N. C_ On ) <-> N. C_ On )
15	13, 14	mpbir 146	. . . 4 |- ( N. C_ On /\ N. C_ On )
16		xpss12 4825	. . . 4 |- ( ( N. C_ On /\ N. C_ On ) -> ( N. X. N. ) C_ ( On X. On ) )
17	15, 16	ax-mp 5	. . 3 |- ( N. X. N. ) C_ ( On X. On )
18		dfss 3211	. . 3 |- ( ( N. X. N. ) C_ ( On X. On ) <-> ( N. X. N. ) = ( ( N. X. N. ) i^i ( On X. On ) ) )
19	17, 18	mpbi 145	. 2 |- ( N. X. N. ) = ( ( N. X. N. ) i^i ( On X. On ) )
20	6, 8, 19	3eqtr4i 2260	1 |- dom +N = ( N. X. N. )

Syntax hints:   /\ wa 104   = wceq 1395   \ cdif 3194   i^i cin 3196   C_ wss 3197   (/)c0 3491   {csn 3666   Oncon0 4453   omcom 4681   X. cxp 4716   dom cdm 4718   |` cres 4720   Fn wfn 5312   +o coa 6557   N.cnpi 7455   +N cpli 7456

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 617  ax-in2 618  ax-io 714  ax-5 1493  ax-7 1494  ax-gen 1495  ax-ie1 1539  ax-ie2 1540  ax-8 1550  ax-10 1551  ax-11 1552  ax-i12 1553  ax-bndl 1555  ax-4 1556  ax-17 1572  ax-i9 1576  ax-ial 1580  ax-i5r 1581  ax-13 2202  ax-14 2203  ax-ext 2211  ax-coll 4198  ax-sep 4201  ax-nul 4209  ax-pow 4257  ax-pr 4292  ax-un 4523  ax-setind 4628  ax-iinf 4679

This theorem depends on definitions:  df-bi 117  df-3an 1004  df-tru 1398  df-fal 1401  df-nf 1507  df-sb 1809  df-eu 2080  df-mo 2081  df-clab 2216  df-cleq 2222  df-clel 2225  df-nfc 2361  df-ne 2401  df-ral 2513  df-rex 2514  df-reu 2515  df-rab 2517  df-v 2801  df-sbc 3029  df-csb 3125  df-dif 3199  df-un 3201  df-in 3203  df-ss 3210  df-nul 3492  df-pw 3651  df-sn 3672  df-pr 3673  df-op 3675  df-uni 3888  df-int 3923  df-iun 3966  df-br 4083  df-opab 4145  df-mpt 4146  df-tr 4182  df-id 4383  df-iord 4456  df-on 4458  df-suc 4461  df-iom 4682  df-xp 4724  df-rel 4725  df-cnv 4726  df-co 4727  df-dm 4728  df-rn 4729  df-res 4730  df-ima 4731  df-iota 5277  df-fun 5319  df-fn 5320  df-f 5321  df-f1 5322  df-fo 5323  df-f1o 5324  df-fv 5325  df-oprab 6004  df-mpo 6005  df-1st 6284  df-2nd 6285  df-recs 6449  df-irdg 6514  df-oadd 6564  df-ni 7487  df-pli 7488

This theorem is referenced by: (None)