Theorem dvdsabseq 12639

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 12584	. . 3 |- ( M || N -> ( M e. ZZ /\ N e. ZZ ) )
2		simpr 110	. . . . . . 7 |- ( ( M || N /\ N || M ) -> N || M )
3		breq1 4134	. . . . . . . . 9 |- ( N = 0 -> ( N || M <-> 0 || M ) )
4		0dvds 12603	. . . . . . . . . . 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 9660	. . . . . . . . . . . . 13 |- ( M e. ZZ -> M e. CC )
7	6	abs00ad 11853	. . . . . . . . . . . 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 466	. . . . . . . 8 |- ( ( N = 0 /\ ( M e. ZZ /\ N e. ZZ ) ) -> ( N || M <-> ( abs ` M ) = 0 ) )
12		fveq2 5698	. . . . . . . . . . 11 |- ( N = 0 -> ( abs ` N ) = ( abs ` 0 ) )
13		abs0 11846	. . . . . . . . . . 11 |- ( abs ` 0 ) = 0
14	12, 13	eqtrdi 2287	. . . . . . . . . 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 2250	. . . . . . . 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 535	. . . . . . 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 2428	. . . . . . . 8 |- ( -. N = 0 -> N =/= 0 )
25	24	adantr 276	. . . . . . 7 |- ( ( -. N = 0 /\ ( M e. ZZ /\ N e. ZZ ) ) -> N =/= 0 )
26		dvdsleabs2 12638	. . . . . . 7 |- ( ( M e. ZZ /\ N e. ZZ /\ N =/= 0 ) -> ( M || N -> ( abs ` M ) <_ ( abs ` N ) ) )
27	21, 23, 25, 26	syl3anc 1278	. . . . . 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 4134	. . . . . . . . . . . . . . 15 |- ( M = 0 -> ( M || N <-> 0 || N ) )
30		0dvds 12603	. . . . . . . . . . . . . . . . 17 |- ( N e. ZZ -> ( 0 || N <-> N = 0 ) )
31		zcn 9660	. . . . . . . . . . . . . . . . . . 19 |- ( N e. ZZ -> N e. CC )
32	31	abs00ad 11853	. . . . . . . . . . . . . . . . . 18 |- ( N e. ZZ -> ( ( abs ` N ) = 0 <-> N = 0 ) )
33		eqcom 2240	. . . . . . . . . . . . . . . . . 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 466	. . . . . . . . . . . . . 14 |- ( ( M = 0 /\ ( M e. ZZ /\ N e. ZZ ) ) -> ( M || N <-> 0 = ( abs ` N ) ) )
38		fveq2 5698	. . . . . . . . . . . . . . . . 17 |- ( M = 0 -> ( abs ` M ) = ( abs ` 0 ) )
39	38, 13	eqtrdi 2287	. . . . . . . . . . . . . . . 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 2247	. . . . . . . . . . . . . 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 1491	. . . . . . . . . 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 535	. . . . . . . . . . . . 13 |- ( ( -. M = 0 /\ ( M e. ZZ /\ N e. ZZ ) ) -> M e. ZZ )
49		neqne 2428	. . . . . . . . . . . . . 14 |- ( -. M = 0 -> M =/= 0 )
50	49	adantr 276	. . . . . . . . . . . . 13 |- ( ( -. M = 0 /\ ( M e. ZZ /\ N e. ZZ ) ) -> M =/= 0 )
51		dvdsleabs2 12638	. . . . . . . . . . . . 13 |- ( ( N e. ZZ /\ M e. ZZ /\ M =/= 0 ) -> ( N || M -> ( abs ` N ) <_ ( abs ` M ) ) )
52	47, 48, 50, 51	syl3anc 1278	. . . . . . . . . . . 12 |- ( ( -. M = 0 /\ ( M e. ZZ /\ N e. ZZ ) ) -> ( N || M -> ( abs ` N ) <_ ( abs ` M ) ) )
53		eqcom 2240	. . . . . . . . . . . . . . . 16 |- ( ( abs ` M ) = ( abs ` N ) <-> ( abs ` N ) = ( abs ` M ) )
54	31	abscld 11970	. . . . . . . . . . . . . . . . 17 |- ( N e. ZZ -> ( abs ` N ) e. RR )
55	6	abscld 11970	. . . . . . . . . . . . . . . . 17 |- ( M e. ZZ -> ( abs ` M ) e. RR )
56		letri3 8412	. . . . . . . . . . . . . . . . 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 9666	. . . . . . . . . . . 12 |- 0 e. ZZ
66		zdceq 9731	. . . . . . . . . . . 12 |- ( ( M e. ZZ /\ 0 e. ZZ ) -> DECID M = 0 )
67	65, 66	mpan2 429	. . . . . . . . . . 11 |- ( M e. ZZ -> DECID M = 0 )
68		exmiddc 848	. . . . . . . . . . 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 730	. . . . . . . 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 9731	. . . . . . 7 |- ( ( N e. ZZ /\ 0 e. ZZ ) -> DECID N = 0 )
77	65, 76	mpan2 429	. . . . . 6 |- ( N e. ZZ -> DECID N = 0 )
78		exmiddc 848	. . . . . 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 730	. . 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 ) )

This proof depends on syntax axioms:   -. wn 3   -> wi 4   /\ wa 104   <-> wb 105   \/ wo 720  DECID wdc 846   = wceq 1402   e. wcel 2209   =/= wne 2420   class class class wbr 4131   ` cfv 5380   RRcr 8184   0cc0 8185   <_ cle 8367   ZZcz 9655   abscabs 11785   || cdvds 12579

This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 623  ax-in2 624  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-coll 4248  ax-sep 4251  ax-nul 4261  ax-pow 4313  ax-pr 4348  ax-un 4580  ax-setind 4686  ax-iinf 4737  ax-cnex 8276  ax-resscn 8277  ax-1cn 8278  ax-1re 8279  ax-icn 8280  ax-addcl 8281  ax-addrcl 8282  ax-mulcl 8283  ax-mulrcl 8284  ax-addcom 8285  ax-mulcom 8286  ax-addass 8287  ax-mulass 8288  ax-distr 8289  ax-i2m1 8290  ax-0lt1 8291  ax-1rid 8292  ax-0id 8293  ax-rnegex 8294  ax-precex 8295  ax-cnre 8296  ax-pre-ltirr 8297  ax-pre-ltwlin 8298  ax-pre-lttrn 8299  ax-pre-apti 8300  ax-pre-ltadd 8301  ax-pre-mulgt0 8302  ax-pre-mulext 8303  ax-arch 8304  ax-caucvg 8305

This proof depends on definitions:  df-bi 117  df-dc 847  df-3or 1010  df-3an 1011  df-tru 1405  df-fal 1408  df-nf 1514  df-sb 1816  df-eu 2089  df-mo 2090  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ne 2421  df-nel 2516  df-ral 2533  df-rex 2534  df-reu 2535  df-rmo 2536  df-rab 2537  df-v 2823  df-sbc 3052  df-csb 3148  df-dif 3222  df-un 3224  df-in 3226  df-ss 3233  df-nul 3521  df-if 3639  df-pw 3690  df-sn 3715  df-pr 3716  df-op 3718  df-uni 3936  df-int 3971  df-iun 4014  df-br 4132  df-opab 4194  df-mpt 4195  df-tr 4232  df-id 4440  df-po 4443  df-iso 4444  df-iord 4513  df-on 4515  df-ilim 4516  df-suc 4518  df-iom 4740  df-xp 4782  df-rel 4783  df-cnv 4784  df-co 4785  df-dm 4786  df-rn 4787  df-res 4788  df-ima 4789  df-iota 5340  df-fun 5382  df-fn 5383  df-f 5384  df-f1 5385  df-fo 5386  df-f1o 5387  df-fv 5388  df-riota 6041  df-ov 6091  df-oprab 6092  df-mpo 6093  df-1st 6378  df-2nd 6379  df-recs 6580  df-frec 6666  df-pnf 8368  df-mnf 8369  df-xr 8370  df-ltxr 8371  df-le 8372  df-sub 8506  df-neg 8507  df-reap 8911  df-ap 8918  df-div 9011  df-inn 9314  df-2 9372  df-3 9373  df-4 9374  df-n0 9575  df-z 9656  df-uz 9938  df-q 10036  df-rp 10072  df-seqfrec 10906  df-exp 10997  df-cj 11629  df-re 11630  df-im 11631  df-rsqrt 11786  df-abs 11787  df-dvds 12580

This theorem is used by:  dvdseq  12640