Intuitionistic Logic Explorer |
< Previous
Next >
Nearby theorems |
||
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 5520 | . . . . 5 | |
2 | 1 | eleq1d 2106 | . . . 4 |
3 | 2 | imbi2d 219 | . . 3 |
4 | oveq2 5520 | . . . . 5 | |
5 | 4 | eleq1d 2106 | . . . 4 |
6 | 5 | imbi2d 219 | . . 3 |
7 | oveq2 5520 | . . . . 5 | |
8 | 7 | eleq1d 2106 | . . . 4 |
9 | 8 | imbi2d 219 | . . 3 |
10 | oveq2 5520 | . . . . 5 | |
11 | 10 | eleq1d 2106 | . . . 4 |
12 | 11 | imbi2d 219 | . . 3 |
13 | peano2nn 7926 | . . 3 | |
14 | peano2nn 7926 | . . . . . 6 | |
15 | nncn 7922 | . . . . . . . 8 | |
16 | nncn 7922 | . . . . . . . 8 | |
17 | ax-1cn 6977 | . . . . . . . . 9 | |
18 | addass 7011 | . . . . . . . . 9 | |
19 | 17, 18 | mp3an3 1221 | . . . . . . . 8 |
20 | 15, 16, 19 | syl2an 273 | . . . . . . 7 |
21 | 20 | eleq1d 2106 | . . . . . 6 |
22 | 14, 21 | syl5ib 143 | . . . . 5 |
23 | 22 | expcom 109 | . . . 4 |
24 | 23 | a2d 23 | . . 3 |
25 | 3, 6, 9, 12, 13, 24 | nnind 7930 | . 2 |
26 | 25 | impcom 116 | 1 |
Colors of variables: wff set class |
Syntax hints: wi 4 wa 97 wceq 1243 wcel 1393 (class class class)co 5512 cc 6887 c1 6890 caddc 6892 cn 7914 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 99 ax-ia2 100 ax-ia3 101 ax-io 630 ax-5 1336 ax-7 1337 ax-gen 1338 ax-ie1 1382 ax-ie2 1383 ax-8 1395 ax-10 1396 ax-11 1397 ax-i12 1398 ax-bndl 1399 ax-4 1400 ax-17 1419 ax-i9 1423 ax-ial 1427 ax-i5r 1428 ax-ext 2022 ax-sep 3875 ax-cnex 6975 ax-resscn 6976 ax-1cn 6977 ax-1re 6978 ax-addrcl 6981 ax-addass 6986 |
This theorem depends on definitions: df-bi 110 df-3an 887 df-tru 1246 df-nf 1350 df-sb 1646 df-clab 2027 df-cleq 2033 df-clel 2036 df-nfc 2167 df-ral 2311 df-rex 2312 df-rab 2315 df-v 2559 df-un 2922 df-in 2924 df-ss 2931 df-sn 3381 df-pr 3382 df-op 3384 df-uni 3581 df-int 3616 df-br 3765 df-iota 4867 df-fv 4910 df-ov 5515 df-inn 7915 |
This theorem is referenced by: nnmulcl 7935 nn2ge 7946 nnaddcld 7961 nnnn0addcl 8212 nn0addcl 8217 |
Copyright terms: Public domain | W3C validator |