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Theorem dvdsabseq 16022
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 ((𝑀𝑁𝑁𝑀) → (abs‘𝑀) = (abs‘𝑁))

Proof of Theorem dvdsabseq
StepHypRef Expression
1 dvdszrcl 15968 . . 3 (𝑀𝑁 → (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ))
2 simpr 485 . . . . . 6 ((𝑀𝑁𝑁𝑀) → 𝑁𝑀)
3 breq1 5077 . . . . . . . 8 (𝑁 = 0 → (𝑁𝑀 ↔ 0 ∥ 𝑀))
4 0dvds 15986 . . . . . . . . . 10 (𝑀 ∈ ℤ → (0 ∥ 𝑀𝑀 = 0))
54adantr 481 . . . . . . . . 9 ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (0 ∥ 𝑀𝑀 = 0))
6 zcn 12324 . . . . . . . . . . . 12 (𝑀 ∈ ℤ → 𝑀 ∈ ℂ)
76abs00ad 15002 . . . . . . . . . . 11 (𝑀 ∈ ℤ → ((abs‘𝑀) = 0 ↔ 𝑀 = 0))
87bicomd 222 . . . . . . . . . 10 (𝑀 ∈ ℤ → (𝑀 = 0 ↔ (abs‘𝑀) = 0))
98adantr 481 . . . . . . . . 9 ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (𝑀 = 0 ↔ (abs‘𝑀) = 0))
105, 9bitrd 278 . . . . . . . 8 ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (0 ∥ 𝑀 ↔ (abs‘𝑀) = 0))
113, 10sylan9bb 510 . . . . . . 7 ((𝑁 = 0 ∧ (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ)) → (𝑁𝑀 ↔ (abs‘𝑀) = 0))
12 fveq2 6774 . . . . . . . . . 10 (𝑁 = 0 → (abs‘𝑁) = (abs‘0))
13 abs0 14997 . . . . . . . . . 10 (abs‘0) = 0
1412, 13eqtrdi 2794 . . . . . . . . 9 (𝑁 = 0 → (abs‘𝑁) = 0)
1514adantr 481 . . . . . . . 8 ((𝑁 = 0 ∧ (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ)) → (abs‘𝑁) = 0)
1615eqeq2d 2749 . . . . . . 7 ((𝑁 = 0 ∧ (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ)) → ((abs‘𝑀) = (abs‘𝑁) ↔ (abs‘𝑀) = 0))
1711, 16bitr4d 281 . . . . . 6 ((𝑁 = 0 ∧ (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ)) → (𝑁𝑀 ↔ (abs‘𝑀) = (abs‘𝑁)))
182, 17syl5ib 243 . . . . 5 ((𝑁 = 0 ∧ (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ)) → ((𝑀𝑁𝑁𝑀) → (abs‘𝑀) = (abs‘𝑁)))
1918expd 416 . . . 4 ((𝑁 = 0 ∧ (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ)) → (𝑀𝑁 → (𝑁𝑀 → (abs‘𝑀) = (abs‘𝑁))))
20 simprl 768 . . . . . 6 ((¬ 𝑁 = 0 ∧ (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ)) → 𝑀 ∈ ℤ)
21 simpr 485 . . . . . . 7 ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → 𝑁 ∈ ℤ)
2221adantl 482 . . . . . 6 ((¬ 𝑁 = 0 ∧ (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ)) → 𝑁 ∈ ℤ)
23 neqne 2951 . . . . . . 7 𝑁 = 0 → 𝑁 ≠ 0)
2423adantr 481 . . . . . 6 ((¬ 𝑁 = 0 ∧ (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ)) → 𝑁 ≠ 0)
25 dvdsleabs2 16021 . . . . . 6 ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝑁 ≠ 0) → (𝑀𝑁 → (abs‘𝑀) ≤ (abs‘𝑁)))
2620, 22, 24, 25syl3anc 1370 . . . . 5 ((¬ 𝑁 = 0 ∧ (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ)) → (𝑀𝑁 → (abs‘𝑀) ≤ (abs‘𝑁)))
27 simpr 485 . . . . . . . . . . 11 ((𝑁𝑀𝑀𝑁) → 𝑀𝑁)
28 breq1 5077 . . . . . . . . . . . . 13 (𝑀 = 0 → (𝑀𝑁 ↔ 0 ∥ 𝑁))
29 0dvds 15986 . . . . . . . . . . . . . . 15 (𝑁 ∈ ℤ → (0 ∥ 𝑁𝑁 = 0))
30 zcn 12324 . . . . . . . . . . . . . . . . 17 (𝑁 ∈ ℤ → 𝑁 ∈ ℂ)
3130abs00ad 15002 . . . . . . . . . . . . . . . 16 (𝑁 ∈ ℤ → ((abs‘𝑁) = 0 ↔ 𝑁 = 0))
32 eqcom 2745 . . . . . . . . . . . . . . . 16 ((abs‘𝑁) = 0 ↔ 0 = (abs‘𝑁))
3331, 32bitr3di 286 . . . . . . . . . . . . . . 15 (𝑁 ∈ ℤ → (𝑁 = 0 ↔ 0 = (abs‘𝑁)))
3429, 33bitrd 278 . . . . . . . . . . . . . 14 (𝑁 ∈ ℤ → (0 ∥ 𝑁 ↔ 0 = (abs‘𝑁)))
3534adantl 482 . . . . . . . . . . . . 13 ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (0 ∥ 𝑁 ↔ 0 = (abs‘𝑁)))
3628, 35sylan9bb 510 . . . . . . . . . . . 12 ((𝑀 = 0 ∧ (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ)) → (𝑀𝑁 ↔ 0 = (abs‘𝑁)))
37 fveq2 6774 . . . . . . . . . . . . . . 15 (𝑀 = 0 → (abs‘𝑀) = (abs‘0))
3837, 13eqtrdi 2794 . . . . . . . . . . . . . 14 (𝑀 = 0 → (abs‘𝑀) = 0)
3938adantr 481 . . . . . . . . . . . . 13 ((𝑀 = 0 ∧ (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ)) → (abs‘𝑀) = 0)
4039eqeq1d 2740 . . . . . . . . . . . 12 ((𝑀 = 0 ∧ (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ)) → ((abs‘𝑀) = (abs‘𝑁) ↔ 0 = (abs‘𝑁)))
4136, 40bitr4d 281 . . . . . . . . . . 11 ((𝑀 = 0 ∧ (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ)) → (𝑀𝑁 ↔ (abs‘𝑀) = (abs‘𝑁)))
4227, 41syl5ib 243 . . . . . . . . . 10 ((𝑀 = 0 ∧ (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ)) → ((𝑁𝑀𝑀𝑁) → (abs‘𝑀) = (abs‘𝑁)))
4342a1dd 50 . . . . . . . . 9 ((𝑀 = 0 ∧ (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ)) → ((𝑁𝑀𝑀𝑁) → ((abs‘𝑀) ≤ (abs‘𝑁) → (abs‘𝑀) = (abs‘𝑁))))
4443expcomd 417 . . . . . . . 8 ((𝑀 = 0 ∧ (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ)) → (𝑀𝑁 → (𝑁𝑀 → ((abs‘𝑀) ≤ (abs‘𝑁) → (abs‘𝑀) = (abs‘𝑁)))))
4521adantl 482 . . . . . . . . . . 11 ((¬ 𝑀 = 0 ∧ (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ)) → 𝑁 ∈ ℤ)
46 simprl 768 . . . . . . . . . . 11 ((¬ 𝑀 = 0 ∧ (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ)) → 𝑀 ∈ ℤ)
47 neqne 2951 . . . . . . . . . . . 12 𝑀 = 0 → 𝑀 ≠ 0)
4847adantr 481 . . . . . . . . . . 11 ((¬ 𝑀 = 0 ∧ (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ)) → 𝑀 ≠ 0)
49 dvdsleabs2 16021 . . . . . . . . . . 11 ((𝑁 ∈ ℤ ∧ 𝑀 ∈ ℤ ∧ 𝑀 ≠ 0) → (𝑁𝑀 → (abs‘𝑁) ≤ (abs‘𝑀)))
5045, 46, 48, 49syl3anc 1370 . . . . . . . . . 10 ((¬ 𝑀 = 0 ∧ (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ)) → (𝑁𝑀 → (abs‘𝑁) ≤ (abs‘𝑀)))
51 eqcom 2745 . . . . . . . . . . . . . 14 ((abs‘𝑀) = (abs‘𝑁) ↔ (abs‘𝑁) = (abs‘𝑀))
5230abscld 15148 . . . . . . . . . . . . . . 15 (𝑁 ∈ ℤ → (abs‘𝑁) ∈ ℝ)
536abscld 15148 . . . . . . . . . . . . . . 15 (𝑀 ∈ ℤ → (abs‘𝑀) ∈ ℝ)
54 letri3 11060 . . . . . . . . . . . . . . 15 (((abs‘𝑁) ∈ ℝ ∧ (abs‘𝑀) ∈ ℝ) → ((abs‘𝑁) = (abs‘𝑀) ↔ ((abs‘𝑁) ≤ (abs‘𝑀) ∧ (abs‘𝑀) ≤ (abs‘𝑁))))
5552, 53, 54syl2anr 597 . . . . . . . . . . . . . 14 ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → ((abs‘𝑁) = (abs‘𝑀) ↔ ((abs‘𝑁) ≤ (abs‘𝑀) ∧ (abs‘𝑀) ≤ (abs‘𝑁))))
5651, 55bitrid 282 . . . . . . . . . . . . 13 ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → ((abs‘𝑀) = (abs‘𝑁) ↔ ((abs‘𝑁) ≤ (abs‘𝑀) ∧ (abs‘𝑀) ≤ (abs‘𝑁))))
5756biimprd 247 . . . . . . . . . . . 12 ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (((abs‘𝑁) ≤ (abs‘𝑀) ∧ (abs‘𝑀) ≤ (abs‘𝑁)) → (abs‘𝑀) = (abs‘𝑁)))
5857expd 416 . . . . . . . . . . 11 ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → ((abs‘𝑁) ≤ (abs‘𝑀) → ((abs‘𝑀) ≤ (abs‘𝑁) → (abs‘𝑀) = (abs‘𝑁))))
5958adantl 482 . . . . . . . . . 10 ((¬ 𝑀 = 0 ∧ (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ)) → ((abs‘𝑁) ≤ (abs‘𝑀) → ((abs‘𝑀) ≤ (abs‘𝑁) → (abs‘𝑀) = (abs‘𝑁))))
6050, 59syld 47 . . . . . . . . 9 ((¬ 𝑀 = 0 ∧ (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ)) → (𝑁𝑀 → ((abs‘𝑀) ≤ (abs‘𝑁) → (abs‘𝑀) = (abs‘𝑁))))
6160a1d 25 . . . . . . . 8 ((¬ 𝑀 = 0 ∧ (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ)) → (𝑀𝑁 → (𝑁𝑀 → ((abs‘𝑀) ≤ (abs‘𝑁) → (abs‘𝑀) = (abs‘𝑁)))))
6244, 61pm2.61ian 809 . . . . . . 7 ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (𝑀𝑁 → (𝑁𝑀 → ((abs‘𝑀) ≤ (abs‘𝑁) → (abs‘𝑀) = (abs‘𝑁)))))
6362com34 91 . . . . . 6 ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (𝑀𝑁 → ((abs‘𝑀) ≤ (abs‘𝑁) → (𝑁𝑀 → (abs‘𝑀) = (abs‘𝑁)))))
6463adantl 482 . . . . 5 ((¬ 𝑁 = 0 ∧ (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ)) → (𝑀𝑁 → ((abs‘𝑀) ≤ (abs‘𝑁) → (𝑁𝑀 → (abs‘𝑀) = (abs‘𝑁)))))
6526, 64mpdd 43 . . . 4 ((¬ 𝑁 = 0 ∧ (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ)) → (𝑀𝑁 → (𝑁𝑀 → (abs‘𝑀) = (abs‘𝑁))))
6619, 65pm2.61ian 809 . . 3 ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (𝑀𝑁 → (𝑁𝑀 → (abs‘𝑀) = (abs‘𝑁))))
671, 66mpcom 38 . 2 (𝑀𝑁 → (𝑁𝑀 → (abs‘𝑀) = (abs‘𝑁)))
6867imp 407 1 ((𝑀𝑁𝑁𝑀) → (abs‘𝑀) = (abs‘𝑁))
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wb 205  wa 396   = wceq 1539  wcel 2106  wne 2943   class class class wbr 5074  cfv 6433  cr 10870  0cc0 10871  cle 11010  cz 12319  abscabs 14945  cdvds 15963
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1798  ax-4 1812  ax-5 1913  ax-6 1971  ax-7 2011  ax-8 2108  ax-9 2116  ax-10 2137  ax-11 2154  ax-12 2171  ax-ext 2709  ax-sep 5223  ax-nul 5230  ax-pow 5288  ax-pr 5352  ax-un 7588  ax-cnex 10927  ax-resscn 10928  ax-1cn 10929  ax-icn 10930  ax-addcl 10931  ax-addrcl 10932  ax-mulcl 10933  ax-mulrcl 10934  ax-mulcom 10935  ax-addass 10936  ax-mulass 10937  ax-distr 10938  ax-i2m1 10939  ax-1ne0 10940  ax-1rid 10941  ax-rnegex 10942  ax-rrecex 10943  ax-cnre 10944  ax-pre-lttri 10945  ax-pre-lttrn 10946  ax-pre-ltadd 10947  ax-pre-mulgt0 10948  ax-pre-sup 10949
This theorem depends on definitions:  df-bi 206  df-an 397  df-or 845  df-3or 1087  df-3an 1088  df-tru 1542  df-fal 1552  df-ex 1783  df-nf 1787  df-sb 2068  df-mo 2540  df-eu 2569  df-clab 2716  df-cleq 2730  df-clel 2816  df-nfc 2889  df-ne 2944  df-nel 3050  df-ral 3069  df-rex 3070  df-rmo 3071  df-reu 3072  df-rab 3073  df-v 3434  df-sbc 3717  df-csb 3833  df-dif 3890  df-un 3892  df-in 3894  df-ss 3904  df-pss 3906  df-nul 4257  df-if 4460  df-pw 4535  df-sn 4562  df-pr 4564  df-op 4568  df-uni 4840  df-iun 4926  df-br 5075  df-opab 5137  df-mpt 5158  df-tr 5192  df-id 5489  df-eprel 5495  df-po 5503  df-so 5504  df-fr 5544  df-we 5546  df-xp 5595  df-rel 5596  df-cnv 5597  df-co 5598  df-dm 5599  df-rn 5600  df-res 5601  df-ima 5602  df-pred 6202  df-ord 6269  df-on 6270  df-lim 6271  df-suc 6272  df-iota 6391  df-fun 6435  df-fn 6436  df-f 6437  df-f1 6438  df-fo 6439  df-f1o 6440  df-fv 6441  df-riota 7232  df-ov 7278  df-oprab 7279  df-mpo 7280  df-om 7713  df-2nd 7832  df-frecs 8097  df-wrecs 8128  df-recs 8202  df-rdg 8241  df-er 8498  df-en 8734  df-dom 8735  df-sdom 8736  df-sup 9201  df-pnf 11011  df-mnf 11012  df-xr 11013  df-ltxr 11014  df-le 11015  df-sub 11207  df-neg 11208  df-div 11633  df-nn 11974  df-2 12036  df-3 12037  df-n0 12234  df-z 12320  df-uz 12583  df-rp 12731  df-seq 13722  df-exp 13783  df-cj 14810  df-re 14811  df-im 14812  df-sqrt 14946  df-abs 14947  df-dvds 15964
This theorem is referenced by:  dvdseq  16023
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