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Theorem ptval 21600
Description: The value of the product topology function. (Contributed by Mario Carneiro, 3-Feb-2015.)
Hypothesis
Ref Expression
ptval.1 𝐵 = {𝑥 ∣ ∃𝑔((𝑔 Fn 𝐴 ∧ ∀𝑦𝐴 (𝑔𝑦) ∈ (𝐹𝑦) ∧ ∃𝑧 ∈ Fin ∀𝑦 ∈ (𝐴𝑧)(𝑔𝑦) = (𝐹𝑦)) ∧ 𝑥 = X𝑦𝐴 (𝑔𝑦))}
Assertion
Ref Expression
ptval ((𝐴𝑉𝐹 Fn 𝐴) → (∏t𝐹) = (topGen‘𝐵))
Distinct variable groups:   𝑥,𝑔,𝑦,𝑧,𝐴   𝑔,𝐹,𝑥,𝑦,𝑧   𝑔,𝑉,𝑥,𝑦,𝑧
Allowed substitution hints:   𝐵(𝑥,𝑦,𝑧,𝑔)

Proof of Theorem ptval
Dummy variable 𝑓 is distinct from all other variables.
StepHypRef Expression
1 df-pt 16319 . . 3 t = (𝑓 ∈ V ↦ (topGen‘{𝑥 ∣ ∃𝑔((𝑔 Fn dom 𝑓 ∧ ∀𝑦 ∈ dom 𝑓(𝑔𝑦) ∈ (𝑓𝑦) ∧ ∃𝑧 ∈ Fin ∀𝑦 ∈ (dom 𝑓𝑧)(𝑔𝑦) = (𝑓𝑦)) ∧ 𝑥 = X𝑦 ∈ dom 𝑓(𝑔𝑦))}))
21a1i 11 . 2 ((𝐴𝑉𝐹 Fn 𝐴) → ∏t = (𝑓 ∈ V ↦ (topGen‘{𝑥 ∣ ∃𝑔((𝑔 Fn dom 𝑓 ∧ ∀𝑦 ∈ dom 𝑓(𝑔𝑦) ∈ (𝑓𝑦) ∧ ∃𝑧 ∈ Fin ∀𝑦 ∈ (dom 𝑓𝑧)(𝑔𝑦) = (𝑓𝑦)) ∧ 𝑥 = X𝑦 ∈ dom 𝑓(𝑔𝑦))})))
3 simpr 480 . . . . . . . . . . 11 (((𝐴𝑉𝐹 Fn 𝐴) ∧ 𝑓 = 𝐹) → 𝑓 = 𝐹)
43dmeqd 5463 . . . . . . . . . 10 (((𝐴𝑉𝐹 Fn 𝐴) ∧ 𝑓 = 𝐹) → dom 𝑓 = dom 𝐹)
5 fndm 6129 . . . . . . . . . . 11 (𝐹 Fn 𝐴 → dom 𝐹 = 𝐴)
65ad2antlr 762 . . . . . . . . . 10 (((𝐴𝑉𝐹 Fn 𝐴) ∧ 𝑓 = 𝐹) → dom 𝐹 = 𝐴)
74, 6eqtrd 2803 . . . . . . . . 9 (((𝐴𝑉𝐹 Fn 𝐴) ∧ 𝑓 = 𝐹) → dom 𝑓 = 𝐴)
87fneq2d 6121 . . . . . . . 8 (((𝐴𝑉𝐹 Fn 𝐴) ∧ 𝑓 = 𝐹) → (𝑔 Fn dom 𝑓𝑔 Fn 𝐴))
93fveq1d 6333 . . . . . . . . . 10 (((𝐴𝑉𝐹 Fn 𝐴) ∧ 𝑓 = 𝐹) → (𝑓𝑦) = (𝐹𝑦))
109eleq2d 2834 . . . . . . . . 9 (((𝐴𝑉𝐹 Fn 𝐴) ∧ 𝑓 = 𝐹) → ((𝑔𝑦) ∈ (𝑓𝑦) ↔ (𝑔𝑦) ∈ (𝐹𝑦)))
117, 10raleqbidv 3299 . . . . . . . 8 (((𝐴𝑉𝐹 Fn 𝐴) ∧ 𝑓 = 𝐹) → (∀𝑦 ∈ dom 𝑓(𝑔𝑦) ∈ (𝑓𝑦) ↔ ∀𝑦𝐴 (𝑔𝑦) ∈ (𝐹𝑦)))
127difeq1d 3875 . . . . . . . . . 10 (((𝐴𝑉𝐹 Fn 𝐴) ∧ 𝑓 = 𝐹) → (dom 𝑓𝑧) = (𝐴𝑧))
139unieqd 4581 . . . . . . . . . . 11 (((𝐴𝑉𝐹 Fn 𝐴) ∧ 𝑓 = 𝐹) → (𝑓𝑦) = (𝐹𝑦))
1413eqeq2d 2779 . . . . . . . . . 10 (((𝐴𝑉𝐹 Fn 𝐴) ∧ 𝑓 = 𝐹) → ((𝑔𝑦) = (𝑓𝑦) ↔ (𝑔𝑦) = (𝐹𝑦)))
1512, 14raleqbidv 3299 . . . . . . . . 9 (((𝐴𝑉𝐹 Fn 𝐴) ∧ 𝑓 = 𝐹) → (∀𝑦 ∈ (dom 𝑓𝑧)(𝑔𝑦) = (𝑓𝑦) ↔ ∀𝑦 ∈ (𝐴𝑧)(𝑔𝑦) = (𝐹𝑦)))
1615rexbidv 3198 . . . . . . . 8 (((𝐴𝑉𝐹 Fn 𝐴) ∧ 𝑓 = 𝐹) → (∃𝑧 ∈ Fin ∀𝑦 ∈ (dom 𝑓𝑧)(𝑔𝑦) = (𝑓𝑦) ↔ ∃𝑧 ∈ Fin ∀𝑦 ∈ (𝐴𝑧)(𝑔𝑦) = (𝐹𝑦)))
178, 11, 163anbi123d 1545 . . . . . . 7 (((𝐴𝑉𝐹 Fn 𝐴) ∧ 𝑓 = 𝐹) → ((𝑔 Fn dom 𝑓 ∧ ∀𝑦 ∈ dom 𝑓(𝑔𝑦) ∈ (𝑓𝑦) ∧ ∃𝑧 ∈ Fin ∀𝑦 ∈ (dom 𝑓𝑧)(𝑔𝑦) = (𝑓𝑦)) ↔ (𝑔 Fn 𝐴 ∧ ∀𝑦𝐴 (𝑔𝑦) ∈ (𝐹𝑦) ∧ ∃𝑧 ∈ Fin ∀𝑦 ∈ (𝐴𝑧)(𝑔𝑦) = (𝐹𝑦))))
187ixpeq1d 8072 . . . . . . . 8 (((𝐴𝑉𝐹 Fn 𝐴) ∧ 𝑓 = 𝐹) → X𝑦 ∈ dom 𝑓(𝑔𝑦) = X𝑦𝐴 (𝑔𝑦))
1918eqeq2d 2779 . . . . . . 7 (((𝐴𝑉𝐹 Fn 𝐴) ∧ 𝑓 = 𝐹) → (𝑥 = X𝑦 ∈ dom 𝑓(𝑔𝑦) ↔ 𝑥 = X𝑦𝐴 (𝑔𝑦)))
2017, 19anbi12d 746 . . . . . 6 (((𝐴𝑉𝐹 Fn 𝐴) ∧ 𝑓 = 𝐹) → (((𝑔 Fn dom 𝑓 ∧ ∀𝑦 ∈ dom 𝑓(𝑔𝑦) ∈ (𝑓𝑦) ∧ ∃𝑧 ∈ Fin ∀𝑦 ∈ (dom 𝑓𝑧)(𝑔𝑦) = (𝑓𝑦)) ∧ 𝑥 = X𝑦 ∈ dom 𝑓(𝑔𝑦)) ↔ ((𝑔 Fn 𝐴 ∧ ∀𝑦𝐴 (𝑔𝑦) ∈ (𝐹𝑦) ∧ ∃𝑧 ∈ Fin ∀𝑦 ∈ (𝐴𝑧)(𝑔𝑦) = (𝐹𝑦)) ∧ 𝑥 = X𝑦𝐴 (𝑔𝑦))))
2120exbidv 2000 . . . . 5 (((𝐴𝑉𝐹 Fn 𝐴) ∧ 𝑓 = 𝐹) → (∃𝑔((𝑔 Fn dom 𝑓 ∧ ∀𝑦 ∈ dom 𝑓(𝑔𝑦) ∈ (𝑓𝑦) ∧ ∃𝑧 ∈ Fin ∀𝑦 ∈ (dom 𝑓𝑧)(𝑔𝑦) = (𝑓𝑦)) ∧ 𝑥 = X𝑦 ∈ dom 𝑓(𝑔𝑦)) ↔ ∃𝑔((𝑔 Fn 𝐴 ∧ ∀𝑦𝐴 (𝑔𝑦) ∈ (𝐹𝑦) ∧ ∃𝑧 ∈ Fin ∀𝑦 ∈ (𝐴𝑧)(𝑔𝑦) = (𝐹𝑦)) ∧ 𝑥 = X𝑦𝐴 (𝑔𝑦))))
2221abbidv 2888 . . . 4 (((𝐴𝑉𝐹 Fn 𝐴) ∧ 𝑓 = 𝐹) → {𝑥 ∣ ∃𝑔((𝑔 Fn dom 𝑓 ∧ ∀𝑦 ∈ dom 𝑓(𝑔𝑦) ∈ (𝑓𝑦) ∧ ∃𝑧 ∈ Fin ∀𝑦 ∈ (dom 𝑓𝑧)(𝑔𝑦) = (𝑓𝑦)) ∧ 𝑥 = X𝑦 ∈ dom 𝑓(𝑔𝑦))} = {𝑥 ∣ ∃𝑔((𝑔 Fn 𝐴 ∧ ∀𝑦𝐴 (𝑔𝑦) ∈ (𝐹𝑦) ∧ ∃𝑧 ∈ Fin ∀𝑦 ∈ (𝐴𝑧)(𝑔𝑦) = (𝐹𝑦)) ∧ 𝑥 = X𝑦𝐴 (𝑔𝑦))})
23 ptval.1 . . . 4 𝐵 = {𝑥 ∣ ∃𝑔((𝑔 Fn 𝐴 ∧ ∀𝑦𝐴 (𝑔𝑦) ∈ (𝐹𝑦) ∧ ∃𝑧 ∈ Fin ∀𝑦 ∈ (𝐴𝑧)(𝑔𝑦) = (𝐹𝑦)) ∧ 𝑥 = X𝑦𝐴 (𝑔𝑦))}
2422, 23syl6eqr 2821 . . 3 (((𝐴𝑉𝐹 Fn 𝐴) ∧ 𝑓 = 𝐹) → {𝑥 ∣ ∃𝑔((𝑔 Fn dom 𝑓 ∧ ∀𝑦 ∈ dom 𝑓(𝑔𝑦) ∈ (𝑓𝑦) ∧ ∃𝑧 ∈ Fin ∀𝑦 ∈ (dom 𝑓𝑧)(𝑔𝑦) = (𝑓𝑦)) ∧ 𝑥 = X𝑦 ∈ dom 𝑓(𝑔𝑦))} = 𝐵)
2524fveq2d 6335 . 2 (((𝐴𝑉𝐹 Fn 𝐴) ∧ 𝑓 = 𝐹) → (topGen‘{𝑥 ∣ ∃𝑔((𝑔 Fn dom 𝑓 ∧ ∀𝑦 ∈ dom 𝑓(𝑔𝑦) ∈ (𝑓𝑦) ∧ ∃𝑧 ∈ Fin ∀𝑦 ∈ (dom 𝑓𝑧)(𝑔𝑦) = (𝑓𝑦)) ∧ 𝑥 = X𝑦 ∈ dom 𝑓(𝑔𝑦))}) = (topGen‘𝐵))
26 fnex 6623 . . 3 ((𝐹 Fn 𝐴𝐴𝑉) → 𝐹 ∈ V)
2726ancoms 469 . 2 ((𝐴𝑉𝐹 Fn 𝐴) → 𝐹 ∈ V)
28 fvexd 6343 . 2 ((𝐴𝑉𝐹 Fn 𝐴) → (topGen‘𝐵) ∈ V)
292, 25, 27, 28fvmptd 6429 1 ((𝐴𝑉𝐹 Fn 𝐴) → (∏t𝐹) = (topGen‘𝐵))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 383  w3a 1069   = wceq 1629  wex 1850  wcel 2143  {cab 2755  wral 3059  wrex 3060  Vcvv 3348  cdif 3717   cuni 4571  cmpt 4860  dom cdm 5248   Fn wfn 6025  cfv 6030  Xcixp 8060  Fincfn 8107  topGenctg 16312  tcpt 16313
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1868  ax-4 1883  ax-5 1989  ax-6 2055  ax-7 2091  ax-9 2152  ax-10 2172  ax-11 2188  ax-12 2201  ax-13 2406  ax-ext 2749  ax-rep 4901  ax-sep 4911  ax-nul 4919  ax-pr 5033
This theorem depends on definitions:  df-bi 197  df-or 384  df-an 385  df-3an 1071  df-tru 1632  df-ex 1851  df-nf 1856  df-sb 2048  df-eu 2620  df-mo 2621  df-clab 2756  df-cleq 2762  df-clel 2765  df-nfc 2900  df-ne 2942  df-ral 3064  df-rex 3065  df-reu 3066  df-rab 3068  df-v 3350  df-sbc 3585  df-csb 3680  df-dif 3723  df-un 3725  df-in 3727  df-ss 3734  df-nul 4061  df-if 4223  df-sn 4314  df-pr 4316  df-op 4320  df-uni 4572  df-iun 4653  df-br 4784  df-opab 4844  df-mpt 4861  df-id 5156  df-xp 5254  df-rel 5255  df-cnv 5256  df-co 5257  df-dm 5258  df-rn 5259  df-res 5260  df-ima 5261  df-iota 5993  df-fun 6032  df-fn 6033  df-f 6034  df-f1 6035  df-fo 6036  df-f1o 6037  df-fv 6038  df-ixp 8061  df-pt 16319
This theorem is referenced by:  pttop  21612  ptopn  21613  ptuni  21624  ptval2  21631  ptpjcn  21641  ptpjopn  21642  ptclsg  21645  ptcnp  21652  prdstopn  21658  xkoptsub  21684  ptcmplem1  22082  tmdgsum2  22126  prdsxmslem2  22560  ptrecube  33742
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