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Theorem dchrelbas2 24762
 Description: A Dirichlet character is a monoid homomorphism from the multiplicative monoid on ℤ/nℤ to the multiplicative monoid of ℂ, which is zero off the group of units of ℤ/nℤ. (Contributed by Mario Carneiro, 18-Apr-2016.)
Hypotheses
Ref Expression
dchrval.g 𝐺 = (DChr‘𝑁)
dchrval.z 𝑍 = (ℤ/nℤ‘𝑁)
dchrval.b 𝐵 = (Base‘𝑍)
dchrval.u 𝑈 = (Unit‘𝑍)
dchrval.n (𝜑𝑁 ∈ ℕ)
dchrbas.b 𝐷 = (Base‘𝐺)
Assertion
Ref Expression
dchrelbas2 (𝜑 → (𝑋𝐷 ↔ (𝑋 ∈ ((mulGrp‘𝑍) MndHom (mulGrp‘ℂfld)) ∧ ∀𝑥𝐵 ((𝑋𝑥) ≠ 0 → 𝑥𝑈))))
Distinct variable groups:   𝑥,𝐵   𝑥,𝑁   𝑥,𝑈   𝜑,𝑥   𝑥,𝑋   𝑥,𝑍
Allowed substitution hints:   𝐷(𝑥)   𝐺(𝑥)

Proof of Theorem dchrelbas2
StepHypRef Expression
1 dchrval.g . . 3 𝐺 = (DChr‘𝑁)
2 dchrval.z . . 3 𝑍 = (ℤ/nℤ‘𝑁)
3 dchrval.b . . 3 𝐵 = (Base‘𝑍)
4 dchrval.u . . 3 𝑈 = (Unit‘𝑍)
5 dchrval.n . . 3 (𝜑𝑁 ∈ ℕ)
6 dchrbas.b . . 3 𝐷 = (Base‘𝐺)
71, 2, 3, 4, 5, 6dchrelbas 24761 . 2 (𝜑 → (𝑋𝐷 ↔ (𝑋 ∈ ((mulGrp‘𝑍) MndHom (mulGrp‘ℂfld)) ∧ ((𝐵𝑈) × {0}) ⊆ 𝑋)))
8 eqid 2610 . . . . . . . . . . 11 (mulGrp‘𝑍) = (mulGrp‘𝑍)
98, 3mgpbas 18318 . . . . . . . . . 10 𝐵 = (Base‘(mulGrp‘𝑍))
10 eqid 2610 . . . . . . . . . . 11 (mulGrp‘ℂfld) = (mulGrp‘ℂfld)
11 cnfldbas 19571 . . . . . . . . . . 11 ℂ = (Base‘ℂfld)
1210, 11mgpbas 18318 . . . . . . . . . 10 ℂ = (Base‘(mulGrp‘ℂfld))
139, 12mhmf 17163 . . . . . . . . 9 (𝑋 ∈ ((mulGrp‘𝑍) MndHom (mulGrp‘ℂfld)) → 𝑋:𝐵⟶ℂ)
1413adantl 481 . . . . . . . 8 ((𝜑𝑋 ∈ ((mulGrp‘𝑍) MndHom (mulGrp‘ℂfld))) → 𝑋:𝐵⟶ℂ)
15 ffun 5961 . . . . . . . 8 (𝑋:𝐵⟶ℂ → Fun 𝑋)
1614, 15syl 17 . . . . . . 7 ((𝜑𝑋 ∈ ((mulGrp‘𝑍) MndHom (mulGrp‘ℂfld))) → Fun 𝑋)
17 funssres 5844 . . . . . . 7 ((Fun 𝑋 ∧ ((𝐵𝑈) × {0}) ⊆ 𝑋) → (𝑋 ↾ dom ((𝐵𝑈) × {0})) = ((𝐵𝑈) × {0}))
1816, 17sylan 487 . . . . . 6 (((𝜑𝑋 ∈ ((mulGrp‘𝑍) MndHom (mulGrp‘ℂfld))) ∧ ((𝐵𝑈) × {0}) ⊆ 𝑋) → (𝑋 ↾ dom ((𝐵𝑈) × {0})) = ((𝐵𝑈) × {0}))
19 simpr 476 . . . . . . 7 (((𝜑𝑋 ∈ ((mulGrp‘𝑍) MndHom (mulGrp‘ℂfld))) ∧ (𝑋 ↾ dom ((𝐵𝑈) × {0})) = ((𝐵𝑈) × {0})) → (𝑋 ↾ dom ((𝐵𝑈) × {0})) = ((𝐵𝑈) × {0}))
20 resss 5342 . . . . . . 7 (𝑋 ↾ dom ((𝐵𝑈) × {0})) ⊆ 𝑋
2119, 20syl6eqssr 3619 . . . . . 6 (((𝜑𝑋 ∈ ((mulGrp‘𝑍) MndHom (mulGrp‘ℂfld))) ∧ (𝑋 ↾ dom ((𝐵𝑈) × {0})) = ((𝐵𝑈) × {0})) → ((𝐵𝑈) × {0}) ⊆ 𝑋)
2218, 21impbida 873 . . . . 5 ((𝜑𝑋 ∈ ((mulGrp‘𝑍) MndHom (mulGrp‘ℂfld))) → (((𝐵𝑈) × {0}) ⊆ 𝑋 ↔ (𝑋 ↾ dom ((𝐵𝑈) × {0})) = ((𝐵𝑈) × {0})))
23 0cn 9911 . . . . . . . . 9 0 ∈ ℂ
24 fconst6g 6007 . . . . . . . . 9 (0 ∈ ℂ → ((𝐵𝑈) × {0}):(𝐵𝑈)⟶ℂ)
2523, 24mp1i 13 . . . . . . . 8 ((𝜑𝑋 ∈ ((mulGrp‘𝑍) MndHom (mulGrp‘ℂfld))) → ((𝐵𝑈) × {0}):(𝐵𝑈)⟶ℂ)
26 fdm 5964 . . . . . . . 8 (((𝐵𝑈) × {0}):(𝐵𝑈)⟶ℂ → dom ((𝐵𝑈) × {0}) = (𝐵𝑈))
2725, 26syl 17 . . . . . . 7 ((𝜑𝑋 ∈ ((mulGrp‘𝑍) MndHom (mulGrp‘ℂfld))) → dom ((𝐵𝑈) × {0}) = (𝐵𝑈))
2827reseq2d 5317 . . . . . 6 ((𝜑𝑋 ∈ ((mulGrp‘𝑍) MndHom (mulGrp‘ℂfld))) → (𝑋 ↾ dom ((𝐵𝑈) × {0})) = (𝑋 ↾ (𝐵𝑈)))
2928eqeq1d 2612 . . . . 5 ((𝜑𝑋 ∈ ((mulGrp‘𝑍) MndHom (mulGrp‘ℂfld))) → ((𝑋 ↾ dom ((𝐵𝑈) × {0})) = ((𝐵𝑈) × {0}) ↔ (𝑋 ↾ (𝐵𝑈)) = ((𝐵𝑈) × {0})))
3022, 29bitrd 267 . . . 4 ((𝜑𝑋 ∈ ((mulGrp‘𝑍) MndHom (mulGrp‘ℂfld))) → (((𝐵𝑈) × {0}) ⊆ 𝑋 ↔ (𝑋 ↾ (𝐵𝑈)) = ((𝐵𝑈) × {0})))
31 difss 3699 . . . . . . . 8 (𝐵𝑈) ⊆ 𝐵
32 fssres 5983 . . . . . . . 8 ((𝑋:𝐵⟶ℂ ∧ (𝐵𝑈) ⊆ 𝐵) → (𝑋 ↾ (𝐵𝑈)):(𝐵𝑈)⟶ℂ)
3314, 31, 32sylancl 693 . . . . . . 7 ((𝜑𝑋 ∈ ((mulGrp‘𝑍) MndHom (mulGrp‘ℂfld))) → (𝑋 ↾ (𝐵𝑈)):(𝐵𝑈)⟶ℂ)
34 ffn 5958 . . . . . . 7 ((𝑋 ↾ (𝐵𝑈)):(𝐵𝑈)⟶ℂ → (𝑋 ↾ (𝐵𝑈)) Fn (𝐵𝑈))
3533, 34syl 17 . . . . . 6 ((𝜑𝑋 ∈ ((mulGrp‘𝑍) MndHom (mulGrp‘ℂfld))) → (𝑋 ↾ (𝐵𝑈)) Fn (𝐵𝑈))
36 ffn 5958 . . . . . . 7 (((𝐵𝑈) × {0}):(𝐵𝑈)⟶ℂ → ((𝐵𝑈) × {0}) Fn (𝐵𝑈))
3725, 36syl 17 . . . . . 6 ((𝜑𝑋 ∈ ((mulGrp‘𝑍) MndHom (mulGrp‘ℂfld))) → ((𝐵𝑈) × {0}) Fn (𝐵𝑈))
38 eqfnfv 6219 . . . . . 6 (((𝑋 ↾ (𝐵𝑈)) Fn (𝐵𝑈) ∧ ((𝐵𝑈) × {0}) Fn (𝐵𝑈)) → ((𝑋 ↾ (𝐵𝑈)) = ((𝐵𝑈) × {0}) ↔ ∀𝑥 ∈ (𝐵𝑈)((𝑋 ↾ (𝐵𝑈))‘𝑥) = (((𝐵𝑈) × {0})‘𝑥)))
3935, 37, 38syl2anc 691 . . . . 5 ((𝜑𝑋 ∈ ((mulGrp‘𝑍) MndHom (mulGrp‘ℂfld))) → ((𝑋 ↾ (𝐵𝑈)) = ((𝐵𝑈) × {0}) ↔ ∀𝑥 ∈ (𝐵𝑈)((𝑋 ↾ (𝐵𝑈))‘𝑥) = (((𝐵𝑈) × {0})‘𝑥)))
40 fvres 6117 . . . . . . . 8 (𝑥 ∈ (𝐵𝑈) → ((𝑋 ↾ (𝐵𝑈))‘𝑥) = (𝑋𝑥))
41 c0ex 9913 . . . . . . . . 9 0 ∈ V
4241fvconst2 6374 . . . . . . . 8 (𝑥 ∈ (𝐵𝑈) → (((𝐵𝑈) × {0})‘𝑥) = 0)
4340, 42eqeq12d 2625 . . . . . . 7 (𝑥 ∈ (𝐵𝑈) → (((𝑋 ↾ (𝐵𝑈))‘𝑥) = (((𝐵𝑈) × {0})‘𝑥) ↔ (𝑋𝑥) = 0))
4443ralbiia 2962 . . . . . 6 (∀𝑥 ∈ (𝐵𝑈)((𝑋 ↾ (𝐵𝑈))‘𝑥) = (((𝐵𝑈) × {0})‘𝑥) ↔ ∀𝑥 ∈ (𝐵𝑈)(𝑋𝑥) = 0)
45 eldif 3550 . . . . . . . . 9 (𝑥 ∈ (𝐵𝑈) ↔ (𝑥𝐵 ∧ ¬ 𝑥𝑈))
4645imbi1i 338 . . . . . . . 8 ((𝑥 ∈ (𝐵𝑈) → (𝑋𝑥) = 0) ↔ ((𝑥𝐵 ∧ ¬ 𝑥𝑈) → (𝑋𝑥) = 0))
47 impexp 461 . . . . . . . 8 (((𝑥𝐵 ∧ ¬ 𝑥𝑈) → (𝑋𝑥) = 0) ↔ (𝑥𝐵 → (¬ 𝑥𝑈 → (𝑋𝑥) = 0)))
48 con1b 347 . . . . . . . . . 10 ((¬ 𝑥𝑈 → (𝑋𝑥) = 0) ↔ (¬ (𝑋𝑥) = 0 → 𝑥𝑈))
49 df-ne 2782 . . . . . . . . . . 11 ((𝑋𝑥) ≠ 0 ↔ ¬ (𝑋𝑥) = 0)
5049imbi1i 338 . . . . . . . . . 10 (((𝑋𝑥) ≠ 0 → 𝑥𝑈) ↔ (¬ (𝑋𝑥) = 0 → 𝑥𝑈))
5148, 50bitr4i 266 . . . . . . . . 9 ((¬ 𝑥𝑈 → (𝑋𝑥) = 0) ↔ ((𝑋𝑥) ≠ 0 → 𝑥𝑈))
5251imbi2i 325 . . . . . . . 8 ((𝑥𝐵 → (¬ 𝑥𝑈 → (𝑋𝑥) = 0)) ↔ (𝑥𝐵 → ((𝑋𝑥) ≠ 0 → 𝑥𝑈)))
5346, 47, 523bitri 285 . . . . . . 7 ((𝑥 ∈ (𝐵𝑈) → (𝑋𝑥) = 0) ↔ (𝑥𝐵 → ((𝑋𝑥) ≠ 0 → 𝑥𝑈)))
5453ralbii2 2961 . . . . . 6 (∀𝑥 ∈ (𝐵𝑈)(𝑋𝑥) = 0 ↔ ∀𝑥𝐵 ((𝑋𝑥) ≠ 0 → 𝑥𝑈))
5544, 54bitri 263 . . . . 5 (∀𝑥 ∈ (𝐵𝑈)((𝑋 ↾ (𝐵𝑈))‘𝑥) = (((𝐵𝑈) × {0})‘𝑥) ↔ ∀𝑥𝐵 ((𝑋𝑥) ≠ 0 → 𝑥𝑈))
5639, 55syl6bb 275 . . . 4 ((𝜑𝑋 ∈ ((mulGrp‘𝑍) MndHom (mulGrp‘ℂfld))) → ((𝑋 ↾ (𝐵𝑈)) = ((𝐵𝑈) × {0}) ↔ ∀𝑥𝐵 ((𝑋𝑥) ≠ 0 → 𝑥𝑈)))
5730, 56bitrd 267 . . 3 ((𝜑𝑋 ∈ ((mulGrp‘𝑍) MndHom (mulGrp‘ℂfld))) → (((𝐵𝑈) × {0}) ⊆ 𝑋 ↔ ∀𝑥𝐵 ((𝑋𝑥) ≠ 0 → 𝑥𝑈)))
5857pm5.32da 671 . 2 (𝜑 → ((𝑋 ∈ ((mulGrp‘𝑍) MndHom (mulGrp‘ℂfld)) ∧ ((𝐵𝑈) × {0}) ⊆ 𝑋) ↔ (𝑋 ∈ ((mulGrp‘𝑍) MndHom (mulGrp‘ℂfld)) ∧ ∀𝑥𝐵 ((𝑋𝑥) ≠ 0 → 𝑥𝑈))))
597, 58bitrd 267 1 (𝜑 → (𝑋𝐷 ↔ (𝑋 ∈ ((mulGrp‘𝑍) MndHom (mulGrp‘ℂfld)) ∧ ∀𝑥𝐵 ((𝑋𝑥) ≠ 0 → 𝑥𝑈))))
 Colors of variables: wff setvar class Syntax hints:  ¬ wn 3   → wi 4   ↔ wb 195   ∧ wa 383   = wceq 1475   ∈ wcel 1977   ≠ wne 2780  ∀wral 2896   ∖ cdif 3537   ⊆ wss 3540  {csn 4125   × cxp 5036  dom cdm 5038   ↾ cres 5040  Fun wfun 5798   Fn wfn 5799  ⟶wf 5800  ‘cfv 5804  (class class class)co 6549  ℂcc 9813  0cc0 9815  ℕcn 10897  Basecbs 15695   MndHom cmhm 17156  mulGrpcmgp 18312  Unitcui 18462  ℂfldccnfld 19567  ℤ/nℤczn 19670  DChrcdchr 24757 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1713  ax-4 1728  ax-5 1827  ax-6 1875  ax-7 1922  ax-8 1979  ax-9 1986  ax-10 2006  ax-11 2021  ax-12 2034  ax-13 2234  ax-ext 2590  ax-sep 4709  ax-nul 4717  ax-pow 4769  ax-pr 4833  ax-un 6847  ax-cnex 9871  ax-resscn 9872  ax-1cn 9873  ax-icn 9874  ax-addcl 9875  ax-addrcl 9876  ax-mulcl 9877  ax-mulrcl 9878  ax-mulcom 9879  ax-addass 9880  ax-mulass 9881  ax-distr 9882  ax-i2m1 9883  ax-1ne0 9884  ax-1rid 9885  ax-rnegex 9886  ax-rrecex 9887  ax-cnre 9888  ax-pre-lttri 9889  ax-pre-lttrn 9890  ax-pre-ltadd 9891  ax-pre-mulgt0 9892 This theorem depends on definitions:  df-bi 196  df-or 384  df-an 385  df-3or 1032  df-3an 1033  df-tru 1478  df-ex 1696  df-nf 1701  df-sb 1868  df-eu 2462  df-mo 2463  df-clab 2597  df-cleq 2603  df-clel 2606  df-nfc 2740  df-ne 2782  df-nel 2783  df-ral 2901  df-rex 2902  df-reu 2903  df-rab 2905  df-v 3175  df-sbc 3403  df-csb 3500  df-dif 3543  df-un 3545  df-in 3547  df-ss 3554  df-pss 3556  df-nul 3875  df-if 4037  df-pw 4110  df-sn 4126  df-pr 4128  df-tp 4130  df-op 4132  df-uni 4373  df-int 4411  df-iun 4457  df-br 4584  df-opab 4644  df-mpt 4645  df-tr 4681  df-eprel 4949  df-id 4953  df-po 4959  df-so 4960  df-fr 4997  df-we 4999  df-xp 5044  df-rel 5045  df-cnv 5046  df-co 5047  df-dm 5048  df-rn 5049  df-res 5050  df-ima 5051  df-pred 5597  df-ord 5643  df-on 5644  df-lim 5645  df-suc 5646  df-iota 5768  df-fun 5806  df-fn 5807  df-f 5808  df-f1 5809  df-fo 5810  df-f1o 5811  df-fv 5812  df-riota 6511  df-ov 6552  df-oprab 6553  df-mpt2 6554  df-om 6958  df-1st 7059  df-2nd 7060  df-wrecs 7294  df-recs 7355  df-rdg 7393  df-1o 7447  df-oadd 7451  df-er 7629  df-map 7746  df-en 7842  df-dom 7843  df-sdom 7844  df-fin 7845  df-pnf 9955  df-mnf 9956  df-xr 9957  df-ltxr 9958  df-le 9959  df-sub 10147  df-neg 10148  df-nn 10898  df-2 10956  df-3 10957  df-4 10958  df-5 10959  df-6 10960  df-7 10961  df-8 10962  df-9 10963  df-n0 11170  df-z 11255  df-dec 11370  df-uz 11564  df-fz 12198  df-struct 15697  df-ndx 15698  df-slot 15699  df-base 15700  df-sets 15701  df-plusg 15781  df-mulr 15782  df-starv 15783  df-tset 15787  df-ple 15788  df-ds 15791  df-unif 15792  df-mhm 17158  df-mgp 18313  df-cnfld 19568  df-dchr 24758 This theorem is referenced by:  dchrelbas3  24763  dchrelbas4  24768  dchrmulcl  24774  dchrn0  24775  dchrmulid2  24777
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