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Theorem ss2ixp 8950
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 3977 . . . . 5 (𝐵𝐶 → ((𝑓𝑥) ∈ 𝐵 → (𝑓𝑥) ∈ 𝐶))
21ral2imi 3085 . . . 4 (∀𝑥𝐴 𝐵𝐶 → (∀𝑥𝐴 (𝑓𝑥) ∈ 𝐵 → ∀𝑥𝐴 (𝑓𝑥) ∈ 𝐶))
32anim2d 612 . . 3 (∀𝑥𝐴 𝐵𝐶 → ((𝑓 Fn {𝑥𝑥𝐴} ∧ ∀𝑥𝐴 (𝑓𝑥) ∈ 𝐵) → (𝑓 Fn {𝑥𝑥𝐴} ∧ ∀𝑥𝐴 (𝑓𝑥) ∈ 𝐶)))
43ss2abdv 4066 . 2 (∀𝑥𝐴 𝐵𝐶 → {𝑓 ∣ (𝑓 Fn {𝑥𝑥𝐴} ∧ ∀𝑥𝐴 (𝑓𝑥) ∈ 𝐵)} ⊆ {𝑓 ∣ (𝑓 Fn {𝑥𝑥𝐴} ∧ ∀𝑥𝐴 (𝑓𝑥) ∈ 𝐶)})
5 df-ixp 8938 . 2 X𝑥𝐴 𝐵 = {𝑓 ∣ (𝑓 Fn {𝑥𝑥𝐴} ∧ ∀𝑥𝐴 (𝑓𝑥) ∈ 𝐵)}
6 df-ixp 8938 . 2 X𝑥𝐴 𝐶 = {𝑓 ∣ (𝑓 Fn {𝑥𝑥𝐴} ∧ ∀𝑥𝐴 (𝑓𝑥) ∈ 𝐶)}
74, 5, 63sstr4g 4037 1 (∀𝑥𝐴 𝐵𝐶X𝑥𝐴 𝐵X𝑥𝐴 𝐶)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 395  wcel 2108  {cab 2714  wral 3061  wss 3951   Fn wfn 6556  cfv 6561  Xcixp 8937
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1795  ax-4 1809  ax-5 1910  ax-6 1967  ax-7 2007  ax-8 2110  ax-9 2118  ax-ext 2708
This theorem depends on definitions:  df-bi 207  df-an 396  df-ex 1780  df-sb 2065  df-clab 2715  df-cleq 2729  df-clel 2816  df-ral 3062  df-ss 3968  df-ixp 8938
This theorem is referenced by:  ixpeq2  8951  boxcutc  8981  pwcfsdom  10623  prdsvallem  17499  prdshom  17512  sscpwex  17859  wunfunc  17946  wunnat  18004  dprdss  20049  psrbaglefi  21946  ptuni2  23584  ptcld  23621  ptclsg  23623  prdstopn  23636  xkopt  23663  tmdgsum2  24104  ressprdsds  24381  prdsbl  24504  ptrecube  37627  prdstotbnd  37801  ixpssixp  45097  ioorrnopnxrlem  46321  ovnlecvr2  46625
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