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Theorem uzin2 15380
Description: The upper integers are closed under intersection. (Contributed by Mario Carneiro, 24-Dec-2013.)
Assertion
Ref Expression
uzin2 ((𝐴 ∈ ran ℤ𝐵 ∈ ran ℤ) → (𝐴𝐵) ∈ ran ℤ)

Proof of Theorem uzin2
Dummy variables 𝑥 𝑦 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 uzf 12879 . . . 4 :ℤ⟶𝒫 ℤ
2 ffn 6737 . . . 4 (ℤ:ℤ⟶𝒫 ℤ → ℤ Fn ℤ)
31, 2ax-mp 5 . . 3 Fn ℤ
4 fvelrnb 6969 . . 3 (ℤ Fn ℤ → (𝐴 ∈ ran ℤ ↔ ∃𝑥 ∈ ℤ (ℤ𝑥) = 𝐴))
53, 4ax-mp 5 . 2 (𝐴 ∈ ran ℤ ↔ ∃𝑥 ∈ ℤ (ℤ𝑥) = 𝐴)
6 fvelrnb 6969 . . 3 (ℤ Fn ℤ → (𝐵 ∈ ran ℤ ↔ ∃𝑦 ∈ ℤ (ℤ𝑦) = 𝐵))
73, 6ax-mp 5 . 2 (𝐵 ∈ ran ℤ ↔ ∃𝑦 ∈ ℤ (ℤ𝑦) = 𝐵)
8 ineq1 4221 . . 3 ((ℤ𝑥) = 𝐴 → ((ℤ𝑥) ∩ (ℤ𝑦)) = (𝐴 ∩ (ℤ𝑦)))
98eleq1d 2824 . 2 ((ℤ𝑥) = 𝐴 → (((ℤ𝑥) ∩ (ℤ𝑦)) ∈ ran ℤ ↔ (𝐴 ∩ (ℤ𝑦)) ∈ ran ℤ))
10 ineq2 4222 . . 3 ((ℤ𝑦) = 𝐵 → (𝐴 ∩ (ℤ𝑦)) = (𝐴𝐵))
1110eleq1d 2824 . 2 ((ℤ𝑦) = 𝐵 → ((𝐴 ∩ (ℤ𝑦)) ∈ ran ℤ ↔ (𝐴𝐵) ∈ ran ℤ))
12 uzin 12916 . . 3 ((𝑥 ∈ ℤ ∧ 𝑦 ∈ ℤ) → ((ℤ𝑥) ∩ (ℤ𝑦)) = (ℤ‘if(𝑥𝑦, 𝑦, 𝑥)))
13 ifcl 4576 . . . . 5 ((𝑦 ∈ ℤ ∧ 𝑥 ∈ ℤ) → if(𝑥𝑦, 𝑦, 𝑥) ∈ ℤ)
1413ancoms 458 . . . 4 ((𝑥 ∈ ℤ ∧ 𝑦 ∈ ℤ) → if(𝑥𝑦, 𝑦, 𝑥) ∈ ℤ)
15 fnfvelrn 7100 . . . 4 ((ℤ Fn ℤ ∧ if(𝑥𝑦, 𝑦, 𝑥) ∈ ℤ) → (ℤ‘if(𝑥𝑦, 𝑦, 𝑥)) ∈ ran ℤ)
163, 14, 15sylancr 587 . . 3 ((𝑥 ∈ ℤ ∧ 𝑦 ∈ ℤ) → (ℤ‘if(𝑥𝑦, 𝑦, 𝑥)) ∈ ran ℤ)
1712, 16eqeltrd 2839 . 2 ((𝑥 ∈ ℤ ∧ 𝑦 ∈ ℤ) → ((ℤ𝑥) ∩ (ℤ𝑦)) ∈ ran ℤ)
185, 7, 9, 11, 172gencl 3522 1 ((𝐴 ∈ ran ℤ𝐵 ∈ ran ℤ) → (𝐴𝐵) ∈ ran ℤ)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 206  wa 395   = wceq 1537  wcel 2106  wrex 3068  cin 3962  ifcif 4531  𝒫 cpw 4605   class class class wbr 5148  ran crn 5690   Fn wfn 6558  wf 6559  cfv 6563  cle 11294  cz 12611  cuz 12876
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1792  ax-4 1806  ax-5 1908  ax-6 1965  ax-7 2005  ax-8 2108  ax-9 2116  ax-10 2139  ax-11 2155  ax-12 2175  ax-ext 2706  ax-sep 5302  ax-nul 5312  ax-pow 5371  ax-pr 5438  ax-un 7754  ax-cnex 11209  ax-resscn 11210  ax-pre-lttri 11227  ax-pre-lttrn 11228
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3or 1087  df-3an 1088  df-tru 1540  df-fal 1550  df-ex 1777  df-nf 1781  df-sb 2063  df-mo 2538  df-eu 2567  df-clab 2713  df-cleq 2727  df-clel 2814  df-nfc 2890  df-ne 2939  df-nel 3045  df-ral 3060  df-rex 3069  df-rab 3434  df-v 3480  df-sbc 3792  df-csb 3909  df-dif 3966  df-un 3968  df-in 3970  df-ss 3980  df-nul 4340  df-if 4532  df-pw 4607  df-sn 4632  df-pr 4634  df-op 4638  df-uni 4913  df-br 5149  df-opab 5211  df-mpt 5232  df-id 5583  df-po 5597  df-so 5598  df-xp 5695  df-rel 5696  df-cnv 5697  df-co 5698  df-dm 5699  df-rn 5700  df-res 5701  df-ima 5702  df-iota 6516  df-fun 6565  df-fn 6566  df-f 6567  df-f1 6568  df-fo 6569  df-f1o 6570  df-fv 6571  df-ov 7434  df-er 8744  df-en 8985  df-dom 8986  df-sdom 8987  df-pnf 11295  df-mnf 11296  df-xr 11297  df-ltxr 11298  df-le 11299  df-neg 11493  df-z 12612  df-uz 12877
This theorem is referenced by:  rexanuz  15381  zfbas  23920  heibor1lem  37796
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