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Theorem dvdsabseq 16020
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 15966 . . 3 (𝑀𝑁 → (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ))
2 simpr 485 . . . . . 6 ((𝑀𝑁𝑁𝑀) → 𝑁𝑀)
3 breq1 5079 . . . . . . . 8 (𝑁 = 0 → (𝑁𝑀 ↔ 0 ∥ 𝑀))
4 0dvds 15984 . . . . . . . . . 10 (𝑀 ∈ ℤ → (0 ∥ 𝑀𝑀 = 0))
54adantr 481 . . . . . . . . 9 ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (0 ∥ 𝑀𝑀 = 0))
6 zcn 12322 . . . . . . . . . . . 12 (𝑀 ∈ ℤ → 𝑀 ∈ ℂ)
76abs00ad 15000 . . . . . . . . . . 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 6776 . . . . . . . . . 10 (𝑁 = 0 → (abs‘𝑁) = (abs‘0))
13 abs0 14995 . . . . . . . . . 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 16019 . . . . . 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 5079 . . . . . . . . . . . . 13 (𝑀 = 0 → (𝑀𝑁 ↔ 0 ∥ 𝑁))
29 0dvds 15984 . . . . . . . . . . . . . . 15 (𝑁 ∈ ℤ → (0 ∥ 𝑁𝑁 = 0))
30 zcn 12322 . . . . . . . . . . . . . . . . 17 (𝑁 ∈ ℤ → 𝑁 ∈ ℂ)
3130abs00ad 15000 . . . . . . . . . . . . . . . 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 6776 . . . . . . . . . . . . . . 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 16019 . . . . . . . . . . 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 15146 . . . . . . . . . . . . . . 15 (𝑁 ∈ ℤ → (abs‘𝑁) ∈ ℝ)
536abscld 15146 . . . . . . . . . . . . . . 15 (𝑀 ∈ ℤ → (abs‘𝑀) ∈ ℝ)
54 letri3 11058 . . . . . . . . . . . . . . 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 5076  cfv 6435  cr 10868  0cc0 10869  cle 11008  cz 12317  abscabs 14943  cdvds 15961
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 5225  ax-nul 5232  ax-pow 5290  ax-pr 5354  ax-un 7588  ax-cnex 10925  ax-resscn 10926  ax-1cn 10927  ax-icn 10928  ax-addcl 10929  ax-addrcl 10930  ax-mulcl 10931  ax-mulrcl 10932  ax-mulcom 10933  ax-addass 10934  ax-mulass 10935  ax-distr 10936  ax-i2m1 10937  ax-1ne0 10938  ax-1rid 10939  ax-rnegex 10940  ax-rrecex 10941  ax-cnre 10942  ax-pre-lttri 10943  ax-pre-lttrn 10944  ax-pre-ltadd 10945  ax-pre-mulgt0 10946  ax-pre-sup 10947
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 3433  df-sbc 3718  df-csb 3834  df-dif 3891  df-un 3893  df-in 3895  df-ss 3905  df-pss 3907  df-nul 4259  df-if 4462  df-pw 4537  df-sn 4564  df-pr 4566  df-op 4570  df-uni 4842  df-iun 4928  df-br 5077  df-opab 5139  df-mpt 5160  df-tr 5194  df-id 5491  df-eprel 5497  df-po 5505  df-so 5506  df-fr 5546  df-we 5548  df-xp 5597  df-rel 5598  df-cnv 5599  df-co 5600  df-dm 5601  df-rn 5602  df-res 5603  df-ima 5604  df-pred 6204  df-ord 6271  df-on 6272  df-lim 6273  df-suc 6274  df-iota 6393  df-fun 6437  df-fn 6438  df-f 6439  df-f1 6440  df-fo 6441  df-f1o 6442  df-fv 6443  df-riota 7234  df-ov 7280  df-oprab 7281  df-mpo 7282  df-om 7713  df-2nd 7832  df-frecs 8095  df-wrecs 8126  df-recs 8200  df-rdg 8239  df-er 8496  df-en 8732  df-dom 8733  df-sdom 8734  df-sup 9199  df-pnf 11009  df-mnf 11010  df-xr 11011  df-ltxr 11012  df-le 11013  df-sub 11205  df-neg 11206  df-div 11631  df-nn 11972  df-2 12034  df-3 12035  df-n0 12232  df-z 12318  df-uz 12581  df-rp 12729  df-seq 13720  df-exp 13781  df-cj 14808  df-re 14809  df-im 14810  df-sqrt 14944  df-abs 14945  df-dvds 15962
This theorem is referenced by:  dvdseq  16021
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