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Theorem ss2ixp 8513
Description: Subclass theorem for infinite Cartesian product. (Contributed by NM, 29-Sep-2006.) (Revised by Mario Carneiro, 12-Aug-2016.)
Assertion
Ref Expression
ss2ixp (∀𝑥𝐴 𝐵𝐶X𝑥𝐴 𝐵X𝑥𝐴 𝐶)

Proof of Theorem ss2ixp
Dummy variable 𝑓 is distinct from all other variables.
StepHypRef Expression
1 ssel 3868 . . . . 5 (𝐵𝐶 → ((𝑓𝑥) ∈ 𝐵 → (𝑓𝑥) ∈ 𝐶))
21ral2imi 3071 . . . 4 (∀𝑥𝐴 𝐵𝐶 → (∀𝑥𝐴 (𝑓𝑥) ∈ 𝐵 → ∀𝑥𝐴 (𝑓𝑥) ∈ 𝐶))
32anim2d 615 . . 3 (∀𝑥𝐴 𝐵𝐶 → ((𝑓 Fn {𝑥𝑥𝐴} ∧ ∀𝑥𝐴 (𝑓𝑥) ∈ 𝐵) → (𝑓 Fn {𝑥𝑥𝐴} ∧ ∀𝑥𝐴 (𝑓𝑥) ∈ 𝐶)))
43ss2abdv 3951 . 2 (∀𝑥𝐴 𝐵𝐶 → {𝑓 ∣ (𝑓 Fn {𝑥𝑥𝐴} ∧ ∀𝑥𝐴 (𝑓𝑥) ∈ 𝐵)} ⊆ {𝑓 ∣ (𝑓 Fn {𝑥𝑥𝐴} ∧ ∀𝑥𝐴 (𝑓𝑥) ∈ 𝐶)})
5 df-ixp 8501 . 2 X𝑥𝐴 𝐵 = {𝑓 ∣ (𝑓 Fn {𝑥𝑥𝐴} ∧ ∀𝑥𝐴 (𝑓𝑥) ∈ 𝐵)}
6 df-ixp 8501 . 2 X𝑥𝐴 𝐶 = {𝑓 ∣ (𝑓 Fn {𝑥𝑥𝐴} ∧ ∀𝑥𝐴 (𝑓𝑥) ∈ 𝐶)}
74, 5, 63sstr4g 3920 1 (∀𝑥𝐴 𝐵𝐶X𝑥𝐴 𝐵X𝑥𝐴 𝐶)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 399  wcel 2113  {cab 2716  wral 3053  wss 3841   Fn wfn 6328  cfv 6333  Xcixp 8500
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1802  ax-4 1816  ax-5 1916  ax-6 1974  ax-7 2019  ax-8 2115  ax-9 2123  ax-ext 2710
This theorem depends on definitions:  df-bi 210  df-an 400  df-tru 1545  df-ex 1787  df-sb 2074  df-clab 2717  df-cleq 2730  df-clel 2811  df-ral 3058  df-v 3399  df-in 3848  df-ss 3858  df-ixp 8501
This theorem is referenced by:  ixpeq2  8514  boxcutc  8544  pwcfsdom  10076  prdsval  16824  prdshom  16836  sscpwex  17183  wunfunc  17267  wunnat  17324  dprdss  19263  psrbaglefi  20738  psrbaglefiOLD  20739  ptuni2  22320  ptcld  22357  ptclsg  22359  prdstopn  22372  xkopt  22399  tmdgsum2  22840  ressprdsds  23117  prdsbl  23237  ptrecube  35389  prdstotbnd  35564  ixpssixp  42164  ioorrnopnxrlem  43373  ovnlecvr2  43674
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