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Theorem nzerooringczr 42397
Description: There is no zero object in the category of unital rings (at least in a universe which contains the zero ring and the ring of integers). Example 7.9 (3) in [Adamek] p. 103. (Contributed by AV, 18-Apr-2020.)
Hypotheses
Ref Expression
nzerooringczr.u (𝜑𝑈𝑉)
nzerooringczr.c 𝐶 = (RingCat‘𝑈)
nzerooringczr.z (𝜑𝑍 ∈ (Ring ∖ NzRing))
nzerooringczr.e (𝜑𝑍𝑈)
nzerooringczr.i (𝜑 → ℤring𝑈)
Assertion
Ref Expression
nzerooringczr (𝜑 → (ZeroO‘𝐶) = ∅)

Proof of Theorem nzerooringczr
Dummy variables 𝑓 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 ax-1 6 . 2 ((ZeroO‘𝐶) = ∅ → (𝜑 → (ZeroO‘𝐶) = ∅))
2 neq0 3963 . . 3 (¬ (ZeroO‘𝐶) = ∅ ↔ ∃ ∈ (ZeroO‘𝐶))
3 nzerooringczr.u . . . . . . . 8 (𝜑𝑈𝑉)
4 nzerooringczr.c . . . . . . . . 9 𝐶 = (RingCat‘𝑈)
54ringccat 42349 . . . . . . . 8 (𝑈𝑉𝐶 ∈ Cat)
63, 5syl 17 . . . . . . 7 (𝜑𝐶 ∈ Cat)
7 iszeroi 16706 . . . . . . 7 ((𝐶 ∈ Cat ∧ ∈ (ZeroO‘𝐶)) → ( ∈ (Base‘𝐶) ∧ ( ∈ (InitO‘𝐶) ∧ ∈ (TermO‘𝐶))))
86, 7sylan 487 . . . . . 6 ((𝜑 ∈ (ZeroO‘𝐶)) → ( ∈ (Base‘𝐶) ∧ ( ∈ (InitO‘𝐶) ∧ ∈ (TermO‘𝐶))))
9 nzerooringczr.z . . . . . . . . 9 (𝜑𝑍 ∈ (Ring ∖ NzRing))
10 nzerooringczr.e . . . . . . . . 9 (𝜑𝑍𝑈)
113, 4, 9, 10zrtermoringc 42395 . . . . . . . 8 (𝜑𝑍 ∈ (TermO‘𝐶))
12 nzerooringczr.i . . . . . . . . . 10 (𝜑 → ℤring𝑈)
133, 12, 4irinitoringc 42394 . . . . . . . . 9 (𝜑 → ℤring ∈ (InitO‘𝐶))
146ad2antrr 762 . . . . . . . . . . . . . . . . 17 (((𝜑 ∈ (InitO‘𝐶)) ∧ ℤring ∈ (InitO‘𝐶)) → 𝐶 ∈ Cat)
15 simplr 807 . . . . . . . . . . . . . . . . 17 (((𝜑 ∈ (InitO‘𝐶)) ∧ ℤring ∈ (InitO‘𝐶)) → ∈ (InitO‘𝐶))
16 simpr 476 . . . . . . . . . . . . . . . . 17 (((𝜑 ∈ (InitO‘𝐶)) ∧ ℤring ∈ (InitO‘𝐶)) → ℤring ∈ (InitO‘𝐶))
1714, 15, 16initoeu1w 16709 . . . . . . . . . . . . . . . 16 (((𝜑 ∈ (InitO‘𝐶)) ∧ ℤring ∈ (InitO‘𝐶)) → ( ≃𝑐𝐶)ℤring)
186ad2antrr 762 . . . . . . . . . . . . . . . . . . . . . 22 (((𝜑 ∈ (TermO‘𝐶)) ∧ 𝑍 ∈ (TermO‘𝐶)) → 𝐶 ∈ Cat)
19 simpr 476 . . . . . . . . . . . . . . . . . . . . . 22 (((𝜑 ∈ (TermO‘𝐶)) ∧ 𝑍 ∈ (TermO‘𝐶)) → 𝑍 ∈ (TermO‘𝐶))
20 simplr 807 . . . . . . . . . . . . . . . . . . . . . 22 (((𝜑 ∈ (TermO‘𝐶)) ∧ 𝑍 ∈ (TermO‘𝐶)) → ∈ (TermO‘𝐶))
2118, 19, 20termoeu1w 16716 . . . . . . . . . . . . . . . . . . . . 21 (((𝜑 ∈ (TermO‘𝐶)) ∧ 𝑍 ∈ (TermO‘𝐶)) → 𝑍( ≃𝑐𝐶))
22 cictr 16512 . . . . . . . . . . . . . . . . . . . . . . . . . 26 ((𝐶 ∈ Cat ∧ 𝑍( ≃𝑐𝐶)( ≃𝑐𝐶)ℤring) → 𝑍( ≃𝑐𝐶)ℤring)
236, 22syl3an1 1399 . . . . . . . . . . . . . . . . . . . . . . . . 25 ((𝜑𝑍( ≃𝑐𝐶)( ≃𝑐𝐶)ℤring) → 𝑍( ≃𝑐𝐶)ℤring)
24 eqid 2651 . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 (Iso‘𝐶) = (Iso‘𝐶)
25 eqid 2651 . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 (Base‘𝐶) = (Base‘𝐶)
269eldifad 3619 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 (𝜑𝑍 ∈ Ring)
2710, 26elind 3831 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 (𝜑𝑍 ∈ (𝑈 ∩ Ring))
284, 25, 3ringcbas 42336 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 (𝜑 → (Base‘𝐶) = (𝑈 ∩ Ring))
2927, 28eleqtrrd 2733 . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 (𝜑𝑍 ∈ (Base‘𝐶))
30 zringring 19869 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 ring ∈ Ring
3130a1i 11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 (𝜑 → ℤring ∈ Ring)
3212, 31elind 3831 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 (𝜑 → ℤring ∈ (𝑈 ∩ Ring))
3332, 28eleqtrrd 2733 . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 (𝜑 → ℤring ∈ (Base‘𝐶))
3424, 25, 6, 29, 33cic 16506 . . . . . . . . . . . . . . . . . . . . . . . . . . 27 (𝜑 → (𝑍( ≃𝑐𝐶)ℤring ↔ ∃𝑓 𝑓 ∈ (𝑍(Iso‘𝐶)ℤring)))
35 n0 3964 . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 ((𝑍(Iso‘𝐶)ℤring) ≠ ∅ ↔ ∃𝑓 𝑓 ∈ (𝑍(Iso‘𝐶)ℤring))
36 eqid 2651 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 (Hom ‘𝐶) = (Hom ‘𝐶)
3725, 36, 24, 6, 29, 33isohom 16483 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 (𝜑 → (𝑍(Iso‘𝐶)ℤring) ⊆ (𝑍(Hom ‘𝐶)ℤring))
38 ssn0 4009 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 (((𝑍(Iso‘𝐶)ℤring) ⊆ (𝑍(Hom ‘𝐶)ℤring) ∧ (𝑍(Iso‘𝐶)ℤring) ≠ ∅) → (𝑍(Hom ‘𝐶)ℤring) ≠ ∅)
394, 25, 3, 36, 29, 33ringchom 42338 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 (𝜑 → (𝑍(Hom ‘𝐶)ℤring) = (𝑍 RingHom ℤring))
4039neeq1d 2882 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 (𝜑 → ((𝑍(Hom ‘𝐶)ℤring) ≠ ∅ ↔ (𝑍 RingHom ℤring) ≠ ∅))
41 zringnzr 19878 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 ring ∈ NzRing
42 nrhmzr 42198 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 ((𝑍 ∈ (Ring ∖ NzRing) ∧ ℤring ∈ NzRing) → (𝑍 RingHom ℤring) = ∅)
439, 41, 42sylancl 695 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 (𝜑 → (𝑍 RingHom ℤring) = ∅)
44 eqneqall 2834 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 ((𝑍 RingHom ℤring) = ∅ → ((𝑍 RingHom ℤring) ≠ ∅ → (ZeroO‘𝐶) = ∅))
4543, 44syl 17 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 (𝜑 → ((𝑍 RingHom ℤring) ≠ ∅ → (ZeroO‘𝐶) = ∅))
4640, 45sylbid 230 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 (𝜑 → ((𝑍(Hom ‘𝐶)ℤring) ≠ ∅ → (ZeroO‘𝐶) = ∅))
4738, 46syl5com 31 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 (((𝑍(Iso‘𝐶)ℤring) ⊆ (𝑍(Hom ‘𝐶)ℤring) ∧ (𝑍(Iso‘𝐶)ℤring) ≠ ∅) → (𝜑 → (ZeroO‘𝐶) = ∅))
4847expcom 450 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 ((𝑍(Iso‘𝐶)ℤring) ≠ ∅ → ((𝑍(Iso‘𝐶)ℤring) ⊆ (𝑍(Hom ‘𝐶)ℤring) → (𝜑 → (ZeroO‘𝐶) = ∅)))
4948com13 88 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 (𝜑 → ((𝑍(Iso‘𝐶)ℤring) ⊆ (𝑍(Hom ‘𝐶)ℤring) → ((𝑍(Iso‘𝐶)ℤring) ≠ ∅ → (ZeroO‘𝐶) = ∅)))
5037, 49mpd 15 . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 (𝜑 → ((𝑍(Iso‘𝐶)ℤring) ≠ ∅ → (ZeroO‘𝐶) = ∅))
5135, 50syl5bir 233 . . . . . . . . . . . . . . . . . . . . . . . . . . 27 (𝜑 → (∃𝑓 𝑓 ∈ (𝑍(Iso‘𝐶)ℤring) → (ZeroO‘𝐶) = ∅))
5234, 51sylbid 230 . . . . . . . . . . . . . . . . . . . . . . . . . 26 (𝜑 → (𝑍( ≃𝑐𝐶)ℤring → (ZeroO‘𝐶) = ∅))
53523ad2ant1 1102 . . . . . . . . . . . . . . . . . . . . . . . . 25 ((𝜑𝑍( ≃𝑐𝐶)( ≃𝑐𝐶)ℤring) → (𝑍( ≃𝑐𝐶)ℤring → (ZeroO‘𝐶) = ∅))
5423, 53mpd 15 . . . . . . . . . . . . . . . . . . . . . . . 24 ((𝜑𝑍( ≃𝑐𝐶)( ≃𝑐𝐶)ℤring) → (ZeroO‘𝐶) = ∅)
55543exp 1283 . . . . . . . . . . . . . . . . . . . . . . 23 (𝜑 → (𝑍( ≃𝑐𝐶) → (( ≃𝑐𝐶)ℤring → (ZeroO‘𝐶) = ∅)))
5655a1dd 50 . . . . . . . . . . . . . . . . . . . . . 22 (𝜑 → (𝑍( ≃𝑐𝐶) → ( ∈ (Base‘𝐶) → (( ≃𝑐𝐶)ℤring → (ZeroO‘𝐶) = ∅))))
5756ad2antrr 762 . . . . . . . . . . . . . . . . . . . . 21 (((𝜑 ∈ (TermO‘𝐶)) ∧ 𝑍 ∈ (TermO‘𝐶)) → (𝑍( ≃𝑐𝐶) → ( ∈ (Base‘𝐶) → (( ≃𝑐𝐶)ℤring → (ZeroO‘𝐶) = ∅))))
5821, 57mpd 15 . . . . . . . . . . . . . . . . . . . 20 (((𝜑 ∈ (TermO‘𝐶)) ∧ 𝑍 ∈ (TermO‘𝐶)) → ( ∈ (Base‘𝐶) → (( ≃𝑐𝐶)ℤring → (ZeroO‘𝐶) = ∅)))
5958exp31 629 . . . . . . . . . . . . . . . . . . 19 (𝜑 → ( ∈ (TermO‘𝐶) → (𝑍 ∈ (TermO‘𝐶) → ( ∈ (Base‘𝐶) → (( ≃𝑐𝐶)ℤring → (ZeroO‘𝐶) = ∅)))))
6059com34 91 . . . . . . . . . . . . . . . . . 18 (𝜑 → ( ∈ (TermO‘𝐶) → ( ∈ (Base‘𝐶) → (𝑍 ∈ (TermO‘𝐶) → (( ≃𝑐𝐶)ℤring → (ZeroO‘𝐶) = ∅)))))
6160com25 99 . . . . . . . . . . . . . . . . 17 (𝜑 → (( ≃𝑐𝐶)ℤring → ( ∈ (Base‘𝐶) → (𝑍 ∈ (TermO‘𝐶) → ( ∈ (TermO‘𝐶) → (ZeroO‘𝐶) = ∅)))))
6261ad2antrr 762 . . . . . . . . . . . . . . . 16 (((𝜑 ∈ (InitO‘𝐶)) ∧ ℤring ∈ (InitO‘𝐶)) → (( ≃𝑐𝐶)ℤring → ( ∈ (Base‘𝐶) → (𝑍 ∈ (TermO‘𝐶) → ( ∈ (TermO‘𝐶) → (ZeroO‘𝐶) = ∅)))))
6317, 62mpd 15 . . . . . . . . . . . . . . 15 (((𝜑 ∈ (InitO‘𝐶)) ∧ ℤring ∈ (InitO‘𝐶)) → ( ∈ (Base‘𝐶) → (𝑍 ∈ (TermO‘𝐶) → ( ∈ (TermO‘𝐶) → (ZeroO‘𝐶) = ∅))))
6463ex 449 . . . . . . . . . . . . . 14 ((𝜑 ∈ (InitO‘𝐶)) → (ℤring ∈ (InitO‘𝐶) → ( ∈ (Base‘𝐶) → (𝑍 ∈ (TermO‘𝐶) → ( ∈ (TermO‘𝐶) → (ZeroO‘𝐶) = ∅)))))
6564com25 99 . . . . . . . . . . . . 13 ((𝜑 ∈ (InitO‘𝐶)) → ( ∈ (TermO‘𝐶) → ( ∈ (Base‘𝐶) → (𝑍 ∈ (TermO‘𝐶) → (ℤring ∈ (InitO‘𝐶) → (ZeroO‘𝐶) = ∅)))))
6665expimpd 628 . . . . . . . . . . . 12 (𝜑 → (( ∈ (InitO‘𝐶) ∧ ∈ (TermO‘𝐶)) → ( ∈ (Base‘𝐶) → (𝑍 ∈ (TermO‘𝐶) → (ℤring ∈ (InitO‘𝐶) → (ZeroO‘𝐶) = ∅)))))
6766com23 86 . . . . . . . . . . 11 (𝜑 → ( ∈ (Base‘𝐶) → (( ∈ (InitO‘𝐶) ∧ ∈ (TermO‘𝐶)) → (𝑍 ∈ (TermO‘𝐶) → (ℤring ∈ (InitO‘𝐶) → (ZeroO‘𝐶) = ∅)))))
6867impd 446 . . . . . . . . . 10 (𝜑 → (( ∈ (Base‘𝐶) ∧ ( ∈ (InitO‘𝐶) ∧ ∈ (TermO‘𝐶))) → (𝑍 ∈ (TermO‘𝐶) → (ℤring ∈ (InitO‘𝐶) → (ZeroO‘𝐶) = ∅))))
6968com24 95 . . . . . . . . 9 (𝜑 → (ℤring ∈ (InitO‘𝐶) → (𝑍 ∈ (TermO‘𝐶) → (( ∈ (Base‘𝐶) ∧ ( ∈ (InitO‘𝐶) ∧ ∈ (TermO‘𝐶))) → (ZeroO‘𝐶) = ∅))))
7013, 69mpd 15 . . . . . . . 8 (𝜑 → (𝑍 ∈ (TermO‘𝐶) → (( ∈ (Base‘𝐶) ∧ ( ∈ (InitO‘𝐶) ∧ ∈ (TermO‘𝐶))) → (ZeroO‘𝐶) = ∅)))
7111, 70mpd 15 . . . . . . 7 (𝜑 → (( ∈ (Base‘𝐶) ∧ ( ∈ (InitO‘𝐶) ∧ ∈ (TermO‘𝐶))) → (ZeroO‘𝐶) = ∅))
7271adantr 480 . . . . . 6 ((𝜑 ∈ (ZeroO‘𝐶)) → (( ∈ (Base‘𝐶) ∧ ( ∈ (InitO‘𝐶) ∧ ∈ (TermO‘𝐶))) → (ZeroO‘𝐶) = ∅))
738, 72mpd 15 . . . . 5 ((𝜑 ∈ (ZeroO‘𝐶)) → (ZeroO‘𝐶) = ∅)
7473expcom 450 . . . 4 ( ∈ (ZeroO‘𝐶) → (𝜑 → (ZeroO‘𝐶) = ∅))
7574exlimiv 1898 . . 3 (∃ ∈ (ZeroO‘𝐶) → (𝜑 → (ZeroO‘𝐶) = ∅))
762, 75sylbi 207 . 2 (¬ (ZeroO‘𝐶) = ∅ → (𝜑 → (ZeroO‘𝐶) = ∅))
771, 76pm2.61i 176 1 (𝜑 → (ZeroO‘𝐶) = ∅)
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wa 383  w3a 1054   = wceq 1523  wex 1744  wcel 2030  wne 2823  cdif 3604  cin 3606  wss 3607  c0 3948   class class class wbr 4685  cfv 5926  (class class class)co 6690  Basecbs 15904  Hom chom 15999  Catccat 16372  Isociso 16453  𝑐 ccic 16502  InitOcinito 16685  TermOctermo 16686  ZeroOczeroo 16687  Ringcrg 18593   RingHom crh 18760  NzRingcnzr 19305  ringzring 19866  RingCatcringc 42328
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1762  ax-4 1777  ax-5 1879  ax-6 1945  ax-7 1981  ax-8 2032  ax-9 2039  ax-10 2059  ax-11 2074  ax-12 2087  ax-13 2282  ax-ext 2631  ax-rep 4804  ax-sep 4814  ax-nul 4822  ax-pow 4873  ax-pr 4936  ax-un 6991  ax-inf2 8576  ax-cnex 10030  ax-resscn 10031  ax-1cn 10032  ax-icn 10033  ax-addcl 10034  ax-addrcl 10035  ax-mulcl 10036  ax-mulrcl 10037  ax-mulcom 10038  ax-addass 10039  ax-mulass 10040  ax-distr 10041  ax-i2m1 10042  ax-1ne0 10043  ax-1rid 10044  ax-rnegex 10045  ax-rrecex 10046  ax-cnre 10047  ax-pre-lttri 10048  ax-pre-lttrn 10049  ax-pre-ltadd 10050  ax-pre-mulgt0 10051  ax-addf 10053  ax-mulf 10054
This theorem depends on definitions:  df-bi 197  df-or 384  df-an 385  df-3or 1055  df-3an 1056  df-tru 1526  df-fal 1529  df-ex 1745  df-nf 1750  df-sb 1938  df-eu 2502  df-mo 2503  df-clab 2638  df-cleq 2644  df-clel 2647  df-nfc 2782  df-ne 2824  df-nel 2927  df-ral 2946  df-rex 2947  df-reu 2948  df-rmo 2949  df-rab 2950  df-v 3233  df-sbc 3469  df-csb 3567  df-dif 3610  df-un 3612  df-in 3614  df-ss 3621  df-pss 3623  df-nul 3949  df-if 4120  df-pw 4193  df-sn 4211  df-pr 4213  df-tp 4215  df-op 4217  df-uni 4469  df-int 4508  df-iun 4554  df-br 4686  df-opab 4746  df-mpt 4763  df-tr 4786  df-id 5053  df-eprel 5058  df-po 5064  df-so 5065  df-fr 5102  df-we 5104  df-xp 5149  df-rel 5150  df-cnv 5151  df-co 5152  df-dm 5153  df-rn 5154  df-res 5155  df-ima 5156  df-pred 5718  df-ord 5764  df-on 5765  df-lim 5766  df-suc 5767  df-iota 5889  df-fun 5928  df-fn 5929  df-f 5930  df-f1 5931  df-fo 5932  df-f1o 5933  df-fv 5934  df-riota 6651  df-ov 6693  df-oprab 6694  df-mpt2 6695  df-om 7108  df-1st 7210  df-2nd 7211  df-supp 7341  df-wrecs 7452  df-recs 7513  df-rdg 7551  df-1o 7605  df-oadd 7609  df-er 7787  df-map 7901  df-pm 7902  df-ixp 7951  df-en 7998  df-dom 7999  df-sdom 8000  df-fin 8001  df-card 8803  df-cda 9028  df-pnf 10114  df-mnf 10115  df-xr 10116  df-ltxr 10117  df-le 10118  df-sub 10306  df-neg 10307  df-nn 11059  df-2 11117  df-3 11118  df-4 11119  df-5 11120  df-6 11121  df-7 11122  df-8 11123  df-9 11124  df-n0 11331  df-xnn0 11402  df-z 11416  df-dec 11532  df-uz 11726  df-fz 12365  df-seq 12842  df-hash 13158  df-struct 15906  df-ndx 15907  df-slot 15908  df-base 15910  df-sets 15911  df-ress 15912  df-plusg 16001  df-mulr 16002  df-starv 16003  df-tset 16007  df-ple 16008  df-ds 16011  df-unif 16012  df-hom 16013  df-cco 16014  df-0g 16149  df-cat 16376  df-cid 16377  df-homf 16378  df-sect 16454  df-inv 16455  df-iso 16456  df-cic 16503  df-ssc 16517  df-resc 16518  df-subc 16519  df-inito 16688  df-termo 16689  df-zeroo 16690  df-estrc 16810  df-mgm 17289  df-sgrp 17331  df-mnd 17342  df-mhm 17382  df-grp 17472  df-minusg 17473  df-mulg 17588  df-subg 17638  df-ghm 17705  df-cmn 18241  df-mgp 18536  df-ur 18548  df-ring 18595  df-cring 18596  df-rnghom 18763  df-subrg 18826  df-nzr 19306  df-cnfld 19795  df-zring 19867  df-ringc 42330
This theorem is referenced by: (None)
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