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Mirrors > Home > ILE Home > Th. List > nnaddcl | Unicode version |
Description: Closure of addition of positive integers, proved by induction on the second addend. (Contributed by NM, 12-Jan-1997.) |
Ref | Expression |
---|---|
nnaddcl |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | oveq2 5782 | . . . . 5 | |
2 | 1 | eleq1d 2208 | . . . 4 |
3 | 2 | imbi2d 229 | . . 3 |
4 | oveq2 5782 | . . . . 5 | |
5 | 4 | eleq1d 2208 | . . . 4 |
6 | 5 | imbi2d 229 | . . 3 |
7 | oveq2 5782 | . . . . 5 | |
8 | 7 | eleq1d 2208 | . . . 4 |
9 | 8 | imbi2d 229 | . . 3 |
10 | oveq2 5782 | . . . . 5 | |
11 | 10 | eleq1d 2208 | . . . 4 |
12 | 11 | imbi2d 229 | . . 3 |
13 | peano2nn 8739 | . . 3 | |
14 | peano2nn 8739 | . . . . . 6 | |
15 | nncn 8735 | . . . . . . . 8 | |
16 | nncn 8735 | . . . . . . . 8 | |
17 | ax-1cn 7720 | . . . . . . . . 9 | |
18 | addass 7757 | . . . . . . . . 9 | |
19 | 17, 18 | mp3an3 1304 | . . . . . . . 8 |
20 | 15, 16, 19 | syl2an 287 | . . . . . . 7 |
21 | 20 | eleq1d 2208 | . . . . . 6 |
22 | 14, 21 | syl5ib 153 | . . . . 5 |
23 | 22 | expcom 115 | . . . 4 |
24 | 23 | a2d 26 | . . 3 |
25 | 3, 6, 9, 12, 13, 24 | nnind 8743 | . 2 |
26 | 25 | impcom 124 | 1 |
Colors of variables: wff set class |
Syntax hints: wi 4 wa 103 wceq 1331 wcel 1480 (class class class)co 5774 cc 7625 c1 7628 caddc 7630 cn 8727 |
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-io 698 ax-5 1423 ax-7 1424 ax-gen 1425 ax-ie1 1469 ax-ie2 1470 ax-8 1482 ax-10 1483 ax-11 1484 ax-i12 1485 ax-bndl 1486 ax-4 1487 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-ext 2121 ax-sep 4046 ax-cnex 7718 ax-resscn 7719 ax-1cn 7720 ax-1re 7721 ax-addrcl 7724 ax-addass 7729 |
This theorem depends on definitions: df-bi 116 df-3an 964 df-tru 1334 df-nf 1437 df-sb 1736 df-clab 2126 df-cleq 2132 df-clel 2135 df-nfc 2270 df-ral 2421 df-rex 2422 df-rab 2425 df-v 2688 df-un 3075 df-in 3077 df-ss 3084 df-sn 3533 df-pr 3534 df-op 3536 df-uni 3737 df-int 3772 df-br 3930 df-iota 5088 df-fv 5131 df-ov 5777 df-inn 8728 |
This theorem is referenced by: nnmulcl 8748 nn2ge 8760 nnaddcld 8775 nnnn0addcl 9014 nn0addcl 9019 9p1e10 9191 |
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