Theorem dvdsabseq 12431

Description: If two integers divide each other, they must be equal, up to a difference in sign. Theorem 1.1(j) in [ApostolNT] p. 14. (Contributed by Mario Carneiro, 30-May-2014.) (Revised by AV, 7-Aug-2021.)

Assertion

Ref	Expression
dvdsabseq	|- ( ( M || N /\ N || M ) -> ( abs ` M ) = ( abs ` N ) )

Proof of Theorem dvdsabseq

Step	Hyp	Ref	Expression
1		dvdszrcl 12376	. . 3 |- ( M || N -> ( M e. ZZ /\ N e. ZZ ) )
2		simpr 110	. . . . . . 7 |- ( ( M || N /\ N || M ) -> N || M )
3		breq1 4092	. . . . . . . . 9 |- ( N = 0 -> ( N || M <-> 0 || M ) )
4		0dvds 12395	. . . . . . . . . . 11 |- ( M e. ZZ -> ( 0 || M <-> M = 0 ) )
5	4	adantr 276	. . . . . . . . . 10 |- ( ( M e. ZZ /\ N e. ZZ ) -> ( 0 || M <-> M = 0 ) )
6		zcn 9489	. . . . . . . . . . . . 13 |- ( M e. ZZ -> M e. CC )
7	6	abs00ad 11648	. . . . . . . . . . . 12 |- ( M e. ZZ -> ( ( abs ` M ) = 0 <-> M = 0 ) )
8	7	bicomd 141	. . . . . . . . . . 11 |- ( M e. ZZ -> ( M = 0 <-> ( abs ` M ) = 0 ) )
9	8	adantr 276	. . . . . . . . . 10 |- ( ( M e. ZZ /\ N e. ZZ ) -> ( M = 0 <-> ( abs ` M ) = 0 ) )
10	5, 9	bitrd 188	. . . . . . . . 9 |- ( ( M e. ZZ /\ N e. ZZ ) -> ( 0 || M <-> ( abs ` M ) = 0 ) )
11	3, 10	sylan9bb 462	. . . . . . . 8 |- ( ( N = 0 /\ ( M e. ZZ /\ N e. ZZ ) ) -> ( N || M <-> ( abs ` M ) = 0 ) )
12		fveq2 5642	. . . . . . . . . . 11 |- ( N = 0 -> ( abs ` N ) = ( abs ` 0 ) )
13		abs0 11641	. . . . . . . . . . 11 |- ( abs ` 0 ) = 0
14	12, 13	eqtrdi 2279	. . . . . . . . . 10 |- ( N = 0 -> ( abs ` N ) = 0 )
15	14	adantr 276	. . . . . . . . 9 |- ( ( N = 0 /\ ( M e. ZZ /\ N e. ZZ ) ) -> ( abs ` N ) = 0 )
16	15	eqeq2d 2242	. . . . . . . 8 |- ( ( N = 0 /\ ( M e. ZZ /\ N e. ZZ ) ) -> ( ( abs ` M ) = ( abs ` N ) <-> ( abs ` M ) = 0 ) )
17	11, 16	bitr4d 191	. . . . . . 7 |- ( ( N = 0 /\ ( M e. ZZ /\ N e. ZZ ) ) -> ( N || M <-> ( abs ` M ) = ( abs ` N ) ) )
18	2, 17	imbitrid 154	. . . . . 6 |- ( ( N = 0 /\ ( M e. ZZ /\ N e. ZZ ) ) -> ( ( M || N /\ N || M ) -> ( abs ` M ) = ( abs ` N ) ) )
19	18	expd 258	. . . . 5 |- ( ( N = 0 /\ ( M e. ZZ /\ N e. ZZ ) ) -> ( M || N -> ( N || M -> ( abs ` M ) = ( abs ` N ) ) ) )
20	19	expcom 116	. . . 4 |- ( ( M e. ZZ /\ N e. ZZ ) -> ( N = 0 -> ( M || N -> ( N || M -> ( abs ` M ) = ( abs ` N ) ) ) ) )
21		simprl 531	. . . . . . 7 |- ( ( -. N = 0 /\ ( M e. ZZ /\ N e. ZZ ) ) -> M e. ZZ )
22		simpr 110	. . . . . . . 8 |- ( ( M e. ZZ /\ N e. ZZ ) -> N e. ZZ )
23	22	adantl 277	. . . . . . 7 |- ( ( -. N = 0 /\ ( M e. ZZ /\ N e. ZZ ) ) -> N e. ZZ )
24		neqne 2409	. . . . . . . 8 |- ( -. N = 0 -> N =/= 0 )
25	24	adantr 276	. . . . . . 7 |- ( ( -. N = 0 /\ ( M e. ZZ /\ N e. ZZ ) ) -> N =/= 0 )
26		dvdsleabs2 12430	. . . . . . 7 |- ( ( M e. ZZ /\ N e. ZZ /\ N =/= 0 ) -> ( M || N -> ( abs ` M ) <_ ( abs ` N ) ) )
27	21, 23, 25, 26	syl3anc 1273	. . . . . 6 |- ( ( -. N = 0 /\ ( M e. ZZ /\ N e. ZZ ) ) -> ( M || N -> ( abs ` M ) <_ ( abs ` N ) ) )
28		simpr 110	. . . . . . . . . . . . 13 |- ( ( N || M /\ M || N ) -> M || N )
29		breq1 4092	. . . . . . . . . . . . . . 15 |- ( M = 0 -> ( M || N <-> 0 || N ) )
30		0dvds 12395	. . . . . . . . . . . . . . . . 17 |- ( N e. ZZ -> ( 0 || N <-> N = 0 ) )
31		zcn 9489	. . . . . . . . . . . . . . . . . . 19 |- ( N e. ZZ -> N e. CC )
32	31	abs00ad 11648	. . . . . . . . . . . . . . . . . 18 |- ( N e. ZZ -> ( ( abs ` N ) = 0 <-> N = 0 ) )
33		eqcom 2232	. . . . . . . . . . . . . . . . . 18 |- ( ( abs ` N ) = 0 <-> 0 = ( abs ` N ) )
34	32, 33	bitr3di 195	. . . . . . . . . . . . . . . . 17 |- ( N e. ZZ -> ( N = 0 <-> 0 = ( abs ` N ) ) )
35	30, 34	bitrd 188	. . . . . . . . . . . . . . . 16 |- ( N e. ZZ -> ( 0 || N <-> 0 = ( abs ` N ) ) )
36	35	adantl 277	. . . . . . . . . . . . . . 15 |- ( ( M e. ZZ /\ N e. ZZ ) -> ( 0 || N <-> 0 = ( abs ` N ) ) )
37	29, 36	sylan9bb 462	. . . . . . . . . . . . . 14 |- ( ( M = 0 /\ ( M e. ZZ /\ N e. ZZ ) ) -> ( M || N <-> 0 = ( abs ` N ) ) )
38		fveq2 5642	. . . . . . . . . . . . . . . . 17 |- ( M = 0 -> ( abs ` M ) = ( abs ` 0 ) )
39	38, 13	eqtrdi 2279	. . . . . . . . . . . . . . . 16 |- ( M = 0 -> ( abs ` M ) = 0 )
40	39	adantr 276	. . . . . . . . . . . . . . 15 |- ( ( M = 0 /\ ( M e. ZZ /\ N e. ZZ ) ) -> ( abs ` M ) = 0 )
41	40	eqeq1d 2239	. . . . . . . . . . . . . 14 |- ( ( M = 0 /\ ( M e. ZZ /\ N e. ZZ ) ) -> ( ( abs ` M ) = ( abs ` N ) <-> 0 = ( abs ` N ) ) )
42	37, 41	bitr4d 191	. . . . . . . . . . . . 13 |- ( ( M = 0 /\ ( M e. ZZ /\ N e. ZZ ) ) -> ( M || N <-> ( abs ` M ) = ( abs ` N ) ) )
43	28, 42	imbitrid 154	. . . . . . . . . . . 12 |- ( ( M = 0 /\ ( M e. ZZ /\ N e. ZZ ) ) -> ( ( N || M /\ M || N ) -> ( abs ` M ) = ( abs ` N ) ) )
44	43	a1dd 48	. . . . . . . . . . 11 |- ( ( M = 0 /\ ( M e. ZZ /\ N e. ZZ ) ) -> ( ( N || M /\ M || N ) -> ( ( abs ` M ) <_ ( abs ` N ) -> ( abs ` M ) = ( abs ` N ) ) ) )
45	44	expcomd 1486	. . . . . . . . . 10 |- ( ( M = 0 /\ ( M e. ZZ /\ N e. ZZ ) ) -> ( M || N -> ( N || M -> ( ( abs ` M ) <_ ( abs ` N ) -> ( abs ` M ) = ( abs ` N ) ) ) ) )
46	45	expcom 116	. . . . . . . . 9 |- ( ( M e. ZZ /\ N e. ZZ ) -> ( M = 0 -> ( M || N -> ( N || M -> ( ( abs ` M ) <_ ( abs ` N ) -> ( abs ` M ) = ( abs ` N ) ) ) ) ) )
47	22	adantl 277	. . . . . . . . . . . . 13 |- ( ( -. M = 0 /\ ( M e. ZZ /\ N e. ZZ ) ) -> N e. ZZ )
48		simprl 531	. . . . . . . . . . . . 13 |- ( ( -. M = 0 /\ ( M e. ZZ /\ N e. ZZ ) ) -> M e. ZZ )
49		neqne 2409	. . . . . . . . . . . . . 14 |- ( -. M = 0 -> M =/= 0 )
50	49	adantr 276	. . . . . . . . . . . . 13 |- ( ( -. M = 0 /\ ( M e. ZZ /\ N e. ZZ ) ) -> M =/= 0 )
51		dvdsleabs2 12430	. . . . . . . . . . . . 13 |- ( ( N e. ZZ /\ M e. ZZ /\ M =/= 0 ) -> ( N || M -> ( abs ` N ) <_ ( abs ` M ) ) )
52	47, 48, 50, 51	syl3anc 1273	. . . . . . . . . . . 12 |- ( ( -. M = 0 /\ ( M e. ZZ /\ N e. ZZ ) ) -> ( N || M -> ( abs ` N ) <_ ( abs ` M ) ) )
53		eqcom 2232	. . . . . . . . . . . . . . . 16 |- ( ( abs ` M ) = ( abs ` N ) <-> ( abs ` N ) = ( abs ` M ) )
54	31	abscld 11764	. . . . . . . . . . . . . . . . 17 |- ( N e. ZZ -> ( abs ` N ) e. RR )
55	6	abscld 11764	. . . . . . . . . . . . . . . . 17 |- ( M e. ZZ -> ( abs ` M ) e. RR )
56		letri3 8265	. . . . . . . . . . . . . . . . 17 |- ( ( ( abs ` N ) e. RR /\ ( abs ` M ) e. RR ) -> ( ( abs ` N ) = ( abs ` M ) <-> ( ( abs ` N ) <_ ( abs ` M ) /\ ( abs ` M ) <_ ( abs ` N ) ) ) )
57	54, 55, 56	syl2anr 290	. . . . . . . . . . . . . . . 16 |- ( ( M e. ZZ /\ N e. ZZ ) -> ( ( abs ` N ) = ( abs ` M ) <-> ( ( abs ` N ) <_ ( abs ` M ) /\ ( abs ` M ) <_ ( abs ` N ) ) ) )
58	53, 57	bitrid 192	. . . . . . . . . . . . . . 15 |- ( ( M e. ZZ /\ N e. ZZ ) -> ( ( abs ` M ) = ( abs ` N ) <-> ( ( abs ` N ) <_ ( abs ` M ) /\ ( abs ` M ) <_ ( abs ` N ) ) ) )
59	58	biimprd 158	. . . . . . . . . . . . . 14 |- ( ( M e. ZZ /\ N e. ZZ ) -> ( ( ( abs ` N ) <_ ( abs ` M ) /\ ( abs ` M ) <_ ( abs ` N ) ) -> ( abs ` M ) = ( abs ` N ) ) )
60	59	expd 258	. . . . . . . . . . . . 13 |- ( ( M e. ZZ /\ N e. ZZ ) -> ( ( abs ` N ) <_ ( abs ` M ) -> ( ( abs ` M ) <_ ( abs ` N ) -> ( abs ` M ) = ( abs ` N ) ) ) )
61	60	adantl 277	. . . . . . . . . . . 12 |- ( ( -. M = 0 /\ ( M e. ZZ /\ N e. ZZ ) ) -> ( ( abs ` N ) <_ ( abs ` M ) -> ( ( abs ` M ) <_ ( abs ` N ) -> ( abs ` M ) = ( abs ` N ) ) ) )
62	52, 61	syld 45	. . . . . . . . . . 11 |- ( ( -. M = 0 /\ ( M e. ZZ /\ N e. ZZ ) ) -> ( N || M -> ( ( abs ` M ) <_ ( abs ` N ) -> ( abs ` M ) = ( abs ` N ) ) ) )
63	62	a1d 22	. . . . . . . . . 10 |- ( ( -. M = 0 /\ ( M e. ZZ /\ N e. ZZ ) ) -> ( M || N -> ( N || M -> ( ( abs ` M ) <_ ( abs ` N ) -> ( abs ` M ) = ( abs ` N ) ) ) ) )
64	63	expcom 116	. . . . . . . . 9 |- ( ( M e. ZZ /\ N e. ZZ ) -> ( -. M = 0 -> ( M || N -> ( N || M -> ( ( abs ` M ) <_ ( abs ` N ) -> ( abs ` M ) = ( abs ` N ) ) ) ) ) )
65		0z 9495	. . . . . . . . . . . 12 |- 0 e. ZZ
66		zdceq 9560	. . . . . . . . . . . 12 |- ( ( M e. ZZ /\ 0 e. ZZ ) -> DECID M = 0 )
67	65, 66	mpan2 425	. . . . . . . . . . 11 |- ( M e. ZZ -> DECID M = 0 )
68		exmiddc 843	. . . . . . . . . . 11 |- (DECID M = 0 -> ( M = 0 \/ -. M = 0 ) )
69	67, 68	syl 14	. . . . . . . . . 10 |- ( M e. ZZ -> ( M = 0 \/ -. M = 0 ) )
70	69	adantr 276	. . . . . . . . 9 |- ( ( M e. ZZ /\ N e. ZZ ) -> ( M = 0 \/ -. M = 0 ) )
71	46, 64, 70	mpjaod 725	. . . . . . . 8 |- ( ( M e. ZZ /\ N e. ZZ ) -> ( M || N -> ( N || M -> ( ( abs ` M ) <_ ( abs ` N ) -> ( abs ` M ) = ( abs ` N ) ) ) ) )
72	71	com34 83	. . . . . . 7 |- ( ( M e. ZZ /\ N e. ZZ ) -> ( M || N -> ( ( abs ` M ) <_ ( abs ` N ) -> ( N || M -> ( abs ` M ) = ( abs ` N ) ) ) ) )
73	72	adantl 277	. . . . . 6 |- ( ( -. N = 0 /\ ( M e. ZZ /\ N e. ZZ ) ) -> ( M || N -> ( ( abs ` M ) <_ ( abs ` N ) -> ( N || M -> ( abs ` M ) = ( abs ` N ) ) ) ) )
74	27, 73	mpdd 41	. . . . 5 |- ( ( -. N = 0 /\ ( M e. ZZ /\ N e. ZZ ) ) -> ( M || N -> ( N || M -> ( abs ` M ) = ( abs ` N ) ) ) )
75	74	expcom 116	. . . 4 |- ( ( M e. ZZ /\ N e. ZZ ) -> ( -. N = 0 -> ( M || N -> ( N || M -> ( abs ` M ) = ( abs ` N ) ) ) ) )
76		zdceq 9560	. . . . . . 7 |- ( ( N e. ZZ /\ 0 e. ZZ ) -> DECID N = 0 )
77	65, 76	mpan2 425	. . . . . 6 |- ( N e. ZZ -> DECID N = 0 )
78		exmiddc 843	. . . . . 6 |- (DECID N = 0 -> ( N = 0 \/ -. N = 0 ) )
79	77, 78	syl 14	. . . . 5 |- ( N e. ZZ -> ( N = 0 \/ -. N = 0 ) )
80	79	adantl 277	. . . 4 |- ( ( M e. ZZ /\ N e. ZZ ) -> ( N = 0 \/ -. N = 0 ) )
81	20, 75, 80	mpjaod 725	. . 3 |- ( ( M e. ZZ /\ N e. ZZ ) -> ( M || N -> ( N || M -> ( abs ` M ) = ( abs ` N ) ) ) )
82	1, 81	mpcom 36	. 2 |- ( M || N -> ( N || M -> ( abs ` M ) = ( abs ` N ) ) )
83	82	imp 124	1 |- ( ( M || N /\ N || M ) -> ( abs ` M ) = ( abs ` N ) )

Syntax hints:   -. wn 3   -> wi 4   /\ wa 104   <-> wb 105   \/ wo 715  DECID wdc 841   = wceq 1397   e. wcel 2201   =/= wne 2401   class class class wbr 4089   ` cfv 5328   RRcr 8036   0cc0 8037   <_ cle 8220   ZZcz 9484   abscabs 11580   || cdvds 12371

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 619  ax-in2 620  ax-io 716  ax-5 1495  ax-7 1496  ax-gen 1497  ax-ie1 1541  ax-ie2 1542  ax-8 1552  ax-10 1553  ax-11 1554  ax-i12 1555  ax-bndl 1557  ax-4 1558  ax-17 1574  ax-i9 1578  ax-ial 1582  ax-i5r 1583  ax-13 2203  ax-14 2204  ax-ext 2212  ax-coll 4205  ax-sep 4208  ax-nul 4216  ax-pow 4266  ax-pr 4301  ax-un 4532  ax-setind 4637  ax-iinf 4688  ax-cnex 8128  ax-resscn 8129  ax-1cn 8130  ax-1re 8131  ax-icn 8132  ax-addcl 8133  ax-addrcl 8134  ax-mulcl 8135  ax-mulrcl 8136  ax-addcom 8137  ax-mulcom 8138  ax-addass 8139  ax-mulass 8140  ax-distr 8141  ax-i2m1 8142  ax-0lt1 8143  ax-1rid 8144  ax-0id 8145  ax-rnegex 8146  ax-precex 8147  ax-cnre 8148  ax-pre-ltirr 8149  ax-pre-ltwlin 8150  ax-pre-lttrn 8151  ax-pre-apti 8152  ax-pre-ltadd 8153  ax-pre-mulgt0 8154  ax-pre-mulext 8155  ax-arch 8156  ax-caucvg 8157

This theorem depends on definitions:  df-bi 117  df-dc 842  df-3or 1005  df-3an 1006  df-tru 1400  df-fal 1403  df-nf 1509  df-sb 1810  df-eu 2081  df-mo 2082  df-clab 2217  df-cleq 2223  df-clel 2226  df-nfc 2362  df-ne 2402  df-nel 2497  df-ral 2514  df-rex 2515  df-reu 2516  df-rmo 2517  df-rab 2518  df-v 2803  df-sbc 3031  df-csb 3127  df-dif 3201  df-un 3203  df-in 3205  df-ss 3212  df-nul 3494  df-if 3605  df-pw 3655  df-sn 3676  df-pr 3677  df-op 3679  df-uni 3895  df-int 3930  df-iun 3973  df-br 4090  df-opab 4152  df-mpt 4153  df-tr 4189  df-id 4392  df-po 4395  df-iso 4396  df-iord 4465  df-on 4467  df-ilim 4468  df-suc 4470  df-iom 4691  df-xp 4733  df-rel 4734  df-cnv 4735  df-co 4736  df-dm 4737  df-rn 4738  df-res 4739  df-ima 4740  df-iota 5288  df-fun 5330  df-fn 5331  df-f 5332  df-f1 5333  df-fo 5334  df-f1o 5335  df-fv 5336  df-riota 5976  df-ov 6026  df-oprab 6027  df-mpo 6028  df-1st 6308  df-2nd 6309  df-recs 6476  df-frec 6562  df-pnf 8221  df-mnf 8222  df-xr 8223  df-ltxr 8224  df-le 8225  df-sub 8357  df-neg 8358  df-reap 8760  df-ap 8767  df-div 8858  df-inn 9149  df-2 9207  df-3 9208  df-4 9209  df-n0 9408  df-z 9485  df-uz 9761  df-q 9859  df-rp 9894  df-seqfrec 10716  df-exp 10807  df-cj 11425  df-re 11426  df-im 11427  df-rsqrt 11581  df-abs 11582  df-dvds 12372

This theorem is referenced by:  dvdseq  12432