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Mirrors > Home > ILE Home > Th. List > dmaddpi | GIF version |
Description: Domain of addition on positive integers. (Contributed by NM, 26-Aug-1995.) |
Ref | Expression |
---|---|
dmaddpi | ⊢ dom +N = (N × N) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | dmres 4848 | . . 3 ⊢ dom ( +o ↾ (N × N)) = ((N × N) ∩ dom +o ) | |
2 | fnoa 6351 | . . . . 5 ⊢ +o Fn (On × On) | |
3 | fndm 5230 | . . . . 5 ⊢ ( +o Fn (On × On) → dom +o = (On × On)) | |
4 | 2, 3 | ax-mp 5 | . . . 4 ⊢ dom +o = (On × On) |
5 | 4 | ineq2i 3279 | . . 3 ⊢ ((N × N) ∩ dom +o ) = ((N × N) ∩ (On × On)) |
6 | 1, 5 | eqtri 2161 | . 2 ⊢ dom ( +o ↾ (N × N)) = ((N × N) ∩ (On × On)) |
7 | df-pli 7137 | . . 3 ⊢ +N = ( +o ↾ (N × N)) | |
8 | 7 | dmeqi 4748 | . 2 ⊢ dom +N = dom ( +o ↾ (N × N)) |
9 | df-ni 7136 | . . . . . . 7 ⊢ N = (ω ∖ {∅}) | |
10 | difss 3207 | . . . . . . 7 ⊢ (ω ∖ {∅}) ⊆ ω | |
11 | 9, 10 | eqsstri 3134 | . . . . . 6 ⊢ N ⊆ ω |
12 | omsson 4534 | . . . . . 6 ⊢ ω ⊆ On | |
13 | 11, 12 | sstri 3111 | . . . . 5 ⊢ N ⊆ On |
14 | anidm 394 | . . . . 5 ⊢ ((N ⊆ On ∧ N ⊆ On) ↔ N ⊆ On) | |
15 | 13, 14 | mpbir 145 | . . . 4 ⊢ (N ⊆ On ∧ N ⊆ On) |
16 | xpss12 4654 | . . . 4 ⊢ ((N ⊆ On ∧ N ⊆ On) → (N × N) ⊆ (On × On)) | |
17 | 15, 16 | ax-mp 5 | . . 3 ⊢ (N × N) ⊆ (On × On) |
18 | dfss 3090 | . . 3 ⊢ ((N × N) ⊆ (On × On) ↔ (N × N) = ((N × N) ∩ (On × On))) | |
19 | 17, 18 | mpbi 144 | . 2 ⊢ (N × N) = ((N × N) ∩ (On × On)) |
20 | 6, 8, 19 | 3eqtr4i 2171 | 1 ⊢ dom +N = (N × N) |
Colors of variables: wff set class |
Syntax hints: ∧ wa 103 = wceq 1332 ∖ cdif 3073 ∩ cin 3075 ⊆ wss 3076 ∅c0 3368 {csn 3532 Oncon0 4293 ωcom 4512 × cxp 4545 dom cdm 4547 ↾ cres 4549 Fn wfn 5126 +o coa 6318 Ncnpi 7104 +N cpli 7105 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 604 ax-in2 605 ax-io 699 ax-5 1424 ax-7 1425 ax-gen 1426 ax-ie1 1470 ax-ie2 1471 ax-8 1483 ax-10 1484 ax-11 1485 ax-i12 1486 ax-bndl 1487 ax-4 1488 ax-13 1492 ax-14 1493 ax-17 1507 ax-i9 1511 ax-ial 1515 ax-i5r 1516 ax-ext 2122 ax-coll 4051 ax-sep 4054 ax-nul 4062 ax-pow 4106 ax-pr 4139 ax-un 4363 ax-setind 4460 ax-iinf 4510 |
This theorem depends on definitions: df-bi 116 df-3an 965 df-tru 1335 df-fal 1338 df-nf 1438 df-sb 1737 df-eu 2003 df-mo 2004 df-clab 2127 df-cleq 2133 df-clel 2136 df-nfc 2271 df-ne 2310 df-ral 2422 df-rex 2423 df-reu 2424 df-rab 2426 df-v 2691 df-sbc 2914 df-csb 3008 df-dif 3078 df-un 3080 df-in 3082 df-ss 3089 df-nul 3369 df-pw 3517 df-sn 3538 df-pr 3539 df-op 3541 df-uni 3745 df-int 3780 df-iun 3823 df-br 3938 df-opab 3998 df-mpt 3999 df-tr 4035 df-id 4223 df-iord 4296 df-on 4298 df-suc 4301 df-iom 4513 df-xp 4553 df-rel 4554 df-cnv 4555 df-co 4556 df-dm 4557 df-rn 4558 df-res 4559 df-ima 4560 df-iota 5096 df-fun 5133 df-fn 5134 df-f 5135 df-f1 5136 df-fo 5137 df-f1o 5138 df-fv 5139 df-oprab 5786 df-mpo 5787 df-1st 6046 df-2nd 6047 df-recs 6210 df-irdg 6275 df-oadd 6325 df-ni 7136 df-pli 7137 |
This theorem is referenced by: (None) |
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