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Mirrors > Home > ILE Home > Th. List > nnmcom | Unicode version |
Description: Multiplication of natural numbers is commutative. Theorem 4K(5) of [Enderton] p. 81. (Contributed by NM, 21-Sep-1995.) (Proof shortened by Andrew Salmon, 22-Oct-2011.) |
Ref | Expression |
---|---|
nnmcom |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | oveq1 5774 | . . . . 5 | |
2 | oveq2 5775 | . . . . 5 | |
3 | 1, 2 | eqeq12d 2152 | . . . 4 |
4 | 3 | imbi2d 229 | . . 3 |
5 | oveq1 5774 | . . . . 5 | |
6 | oveq2 5775 | . . . . 5 | |
7 | 5, 6 | eqeq12d 2152 | . . . 4 |
8 | oveq1 5774 | . . . . 5 | |
9 | oveq2 5775 | . . . . 5 | |
10 | 8, 9 | eqeq12d 2152 | . . . 4 |
11 | oveq1 5774 | . . . . 5 | |
12 | oveq2 5775 | . . . . 5 | |
13 | 11, 12 | eqeq12d 2152 | . . . 4 |
14 | nnm0r 6368 | . . . . 5 | |
15 | nnm0 6364 | . . . . 5 | |
16 | 14, 15 | eqtr4d 2173 | . . . 4 |
17 | oveq1 5774 | . . . . . 6 | |
18 | nnmsucr 6377 | . . . . . . 7 | |
19 | nnmsuc 6366 | . . . . . . . 8 | |
20 | 19 | ancoms 266 | . . . . . . 7 |
21 | 18, 20 | eqeq12d 2152 | . . . . . 6 |
22 | 17, 21 | syl5ibr 155 | . . . . 5 |
23 | 22 | ex 114 | . . . 4 |
24 | 7, 10, 13, 16, 23 | finds2 4510 | . . 3 |
25 | 4, 24 | vtoclga 2747 | . 2 |
26 | 25 | imp 123 | 1 |
Colors of variables: wff set class |
Syntax hints: wi 4 wa 103 wceq 1331 wcel 1480 c0 3358 csuc 4282 com 4499 (class class class)co 5767 coa 6303 comu 6304 |
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 603 ax-in2 604 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-13 1491 ax-14 1492 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-ext 2119 ax-coll 4038 ax-sep 4041 ax-nul 4049 ax-pow 4093 ax-pr 4126 ax-un 4350 ax-setind 4447 ax-iinf 4497 |
This theorem depends on definitions: df-bi 116 df-3an 964 df-tru 1334 df-fal 1337 df-nf 1437 df-sb 1736 df-eu 2000 df-mo 2001 df-clab 2124 df-cleq 2130 df-clel 2133 df-nfc 2268 df-ne 2307 df-ral 2419 df-rex 2420 df-reu 2421 df-rab 2423 df-v 2683 df-sbc 2905 df-csb 2999 df-dif 3068 df-un 3070 df-in 3072 df-ss 3079 df-nul 3359 df-pw 3507 df-sn 3528 df-pr 3529 df-op 3531 df-uni 3732 df-int 3767 df-iun 3810 df-br 3925 df-opab 3985 df-mpt 3986 df-tr 4022 df-id 4210 df-iord 4283 df-on 4285 df-suc 4288 df-iom 4500 df-xp 4540 df-rel 4541 df-cnv 4542 df-co 4543 df-dm 4544 df-rn 4545 df-res 4546 df-ima 4547 df-iota 5083 df-fun 5120 df-fn 5121 df-f 5122 df-f1 5123 df-fo 5124 df-f1o 5125 df-fv 5126 df-ov 5770 df-oprab 5771 df-mpo 5772 df-1st 6031 df-2nd 6032 df-recs 6195 df-irdg 6260 df-oadd 6310 df-omul 6311 |
This theorem is referenced by: nndir 6379 nn2m 6415 mulcompig 7132 enq0sym 7233 enq0ref 7234 enq0tr 7235 addcmpblnq0 7244 mulcmpblnq0 7245 mulcanenq0ec 7246 nnanq0 7259 distrnq0 7260 mulcomnq0 7261 addassnq0 7263 nq02m 7266 |
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