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Theorem ishtpy 22818
Description: Membership in the class of homotopies between two continuous functions. (Contributed by Mario Carneiro, 22-Feb-2015.) (Revised by Mario Carneiro, 5-Sep-2015.)
Hypotheses
Ref Expression
ishtpy.1 (𝜑𝐽 ∈ (TopOn‘𝑋))
ishtpy.3 (𝜑𝐹 ∈ (𝐽 Cn 𝐾))
ishtpy.4 (𝜑𝐺 ∈ (𝐽 Cn 𝐾))
Assertion
Ref Expression
ishtpy (𝜑 → (𝐻 ∈ (𝐹(𝐽 Htpy 𝐾)𝐺) ↔ (𝐻 ∈ ((𝐽 ×t II) Cn 𝐾) ∧ ∀𝑠𝑋 ((𝑠𝐻0) = (𝐹𝑠) ∧ (𝑠𝐻1) = (𝐺𝑠)))))
Distinct variable groups:   𝐹,𝑠   𝐺,𝑠   𝐻,𝑠   𝐽,𝑠   𝜑,𝑠   𝑋,𝑠
Allowed substitution hint:   𝐾(𝑠)

Proof of Theorem ishtpy
Dummy variables 𝑓 𝑔 𝑗 𝑘 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 df-htpy 22816 . . . . . 6 Htpy = (𝑗 ∈ Top, 𝑘 ∈ Top ↦ (𝑓 ∈ (𝑗 Cn 𝑘), 𝑔 ∈ (𝑗 Cn 𝑘) ↦ { ∈ ((𝑗 ×t II) Cn 𝑘) ∣ ∀𝑠 𝑗((𝑠0) = (𝑓𝑠) ∧ (𝑠1) = (𝑔𝑠))}))
21a1i 11 . . . . 5 (𝜑 → Htpy = (𝑗 ∈ Top, 𝑘 ∈ Top ↦ (𝑓 ∈ (𝑗 Cn 𝑘), 𝑔 ∈ (𝑗 Cn 𝑘) ↦ { ∈ ((𝑗 ×t II) Cn 𝑘) ∣ ∀𝑠 𝑗((𝑠0) = (𝑓𝑠) ∧ (𝑠1) = (𝑔𝑠))})))
3 simprl 809 . . . . . . 7 ((𝜑 ∧ (𝑗 = 𝐽𝑘 = 𝐾)) → 𝑗 = 𝐽)
4 simprr 811 . . . . . . 7 ((𝜑 ∧ (𝑗 = 𝐽𝑘 = 𝐾)) → 𝑘 = 𝐾)
53, 4oveq12d 6708 . . . . . 6 ((𝜑 ∧ (𝑗 = 𝐽𝑘 = 𝐾)) → (𝑗 Cn 𝑘) = (𝐽 Cn 𝐾))
63oveq1d 6705 . . . . . . . 8 ((𝜑 ∧ (𝑗 = 𝐽𝑘 = 𝐾)) → (𝑗 ×t II) = (𝐽 ×t II))
76, 4oveq12d 6708 . . . . . . 7 ((𝜑 ∧ (𝑗 = 𝐽𝑘 = 𝐾)) → ((𝑗 ×t II) Cn 𝑘) = ((𝐽 ×t II) Cn 𝐾))
83unieqd 4478 . . . . . . . . 9 ((𝜑 ∧ (𝑗 = 𝐽𝑘 = 𝐾)) → 𝑗 = 𝐽)
9 ishtpy.1 . . . . . . . . . . 11 (𝜑𝐽 ∈ (TopOn‘𝑋))
10 toponuni 20767 . . . . . . . . . . 11 (𝐽 ∈ (TopOn‘𝑋) → 𝑋 = 𝐽)
119, 10syl 17 . . . . . . . . . 10 (𝜑𝑋 = 𝐽)
1211adantr 480 . . . . . . . . 9 ((𝜑 ∧ (𝑗 = 𝐽𝑘 = 𝐾)) → 𝑋 = 𝐽)
138, 12eqtr4d 2688 . . . . . . . 8 ((𝜑 ∧ (𝑗 = 𝐽𝑘 = 𝐾)) → 𝑗 = 𝑋)
1413raleqdv 3174 . . . . . . 7 ((𝜑 ∧ (𝑗 = 𝐽𝑘 = 𝐾)) → (∀𝑠 𝑗((𝑠0) = (𝑓𝑠) ∧ (𝑠1) = (𝑔𝑠)) ↔ ∀𝑠𝑋 ((𝑠0) = (𝑓𝑠) ∧ (𝑠1) = (𝑔𝑠))))
157, 14rabeqbidv 3226 . . . . . 6 ((𝜑 ∧ (𝑗 = 𝐽𝑘 = 𝐾)) → { ∈ ((𝑗 ×t II) Cn 𝑘) ∣ ∀𝑠 𝑗((𝑠0) = (𝑓𝑠) ∧ (𝑠1) = (𝑔𝑠))} = { ∈ ((𝐽 ×t II) Cn 𝐾) ∣ ∀𝑠𝑋 ((𝑠0) = (𝑓𝑠) ∧ (𝑠1) = (𝑔𝑠))})
165, 5, 15mpt2eq123dv 6759 . . . . 5 ((𝜑 ∧ (𝑗 = 𝐽𝑘 = 𝐾)) → (𝑓 ∈ (𝑗 Cn 𝑘), 𝑔 ∈ (𝑗 Cn 𝑘) ↦ { ∈ ((𝑗 ×t II) Cn 𝑘) ∣ ∀𝑠 𝑗((𝑠0) = (𝑓𝑠) ∧ (𝑠1) = (𝑔𝑠))}) = (𝑓 ∈ (𝐽 Cn 𝐾), 𝑔 ∈ (𝐽 Cn 𝐾) ↦ { ∈ ((𝐽 ×t II) Cn 𝐾) ∣ ∀𝑠𝑋 ((𝑠0) = (𝑓𝑠) ∧ (𝑠1) = (𝑔𝑠))}))
17 topontop 20766 . . . . . 6 (𝐽 ∈ (TopOn‘𝑋) → 𝐽 ∈ Top)
189, 17syl 17 . . . . 5 (𝜑𝐽 ∈ Top)
19 ishtpy.3 . . . . . 6 (𝜑𝐹 ∈ (𝐽 Cn 𝐾))
20 cntop2 21093 . . . . . 6 (𝐹 ∈ (𝐽 Cn 𝐾) → 𝐾 ∈ Top)
2119, 20syl 17 . . . . 5 (𝜑𝐾 ∈ Top)
22 ssrab2 3720 . . . . . . . . . 10 { ∈ ((𝐽 ×t II) Cn 𝐾) ∣ ∀𝑠𝑋 ((𝑠0) = (𝑓𝑠) ∧ (𝑠1) = (𝑔𝑠))} ⊆ ((𝐽 ×t II) Cn 𝐾)
23 ovex 6718 . . . . . . . . . . 11 ((𝐽 ×t II) Cn 𝐾) ∈ V
2423elpw2 4858 . . . . . . . . . 10 ({ ∈ ((𝐽 ×t II) Cn 𝐾) ∣ ∀𝑠𝑋 ((𝑠0) = (𝑓𝑠) ∧ (𝑠1) = (𝑔𝑠))} ∈ 𝒫 ((𝐽 ×t II) Cn 𝐾) ↔ { ∈ ((𝐽 ×t II) Cn 𝐾) ∣ ∀𝑠𝑋 ((𝑠0) = (𝑓𝑠) ∧ (𝑠1) = (𝑔𝑠))} ⊆ ((𝐽 ×t II) Cn 𝐾))
2522, 24mpbir 221 . . . . . . . . 9 { ∈ ((𝐽 ×t II) Cn 𝐾) ∣ ∀𝑠𝑋 ((𝑠0) = (𝑓𝑠) ∧ (𝑠1) = (𝑔𝑠))} ∈ 𝒫 ((𝐽 ×t II) Cn 𝐾)
2625rgen2w 2954 . . . . . . . 8 𝑓 ∈ (𝐽 Cn 𝐾)∀𝑔 ∈ (𝐽 Cn 𝐾){ ∈ ((𝐽 ×t II) Cn 𝐾) ∣ ∀𝑠𝑋 ((𝑠0) = (𝑓𝑠) ∧ (𝑠1) = (𝑔𝑠))} ∈ 𝒫 ((𝐽 ×t II) Cn 𝐾)
27 eqid 2651 . . . . . . . . 9 (𝑓 ∈ (𝐽 Cn 𝐾), 𝑔 ∈ (𝐽 Cn 𝐾) ↦ { ∈ ((𝐽 ×t II) Cn 𝐾) ∣ ∀𝑠𝑋 ((𝑠0) = (𝑓𝑠) ∧ (𝑠1) = (𝑔𝑠))}) = (𝑓 ∈ (𝐽 Cn 𝐾), 𝑔 ∈ (𝐽 Cn 𝐾) ↦ { ∈ ((𝐽 ×t II) Cn 𝐾) ∣ ∀𝑠𝑋 ((𝑠0) = (𝑓𝑠) ∧ (𝑠1) = (𝑔𝑠))})
2827fmpt2 7282 . . . . . . . 8 (∀𝑓 ∈ (𝐽 Cn 𝐾)∀𝑔 ∈ (𝐽 Cn 𝐾){ ∈ ((𝐽 ×t II) Cn 𝐾) ∣ ∀𝑠𝑋 ((𝑠0) = (𝑓𝑠) ∧ (𝑠1) = (𝑔𝑠))} ∈ 𝒫 ((𝐽 ×t II) Cn 𝐾) ↔ (𝑓 ∈ (𝐽 Cn 𝐾), 𝑔 ∈ (𝐽 Cn 𝐾) ↦ { ∈ ((𝐽 ×t II) Cn 𝐾) ∣ ∀𝑠𝑋 ((𝑠0) = (𝑓𝑠) ∧ (𝑠1) = (𝑔𝑠))}):((𝐽 Cn 𝐾) × (𝐽 Cn 𝐾))⟶𝒫 ((𝐽 ×t II) Cn 𝐾))
2926, 28mpbi 220 . . . . . . 7 (𝑓 ∈ (𝐽 Cn 𝐾), 𝑔 ∈ (𝐽 Cn 𝐾) ↦ { ∈ ((𝐽 ×t II) Cn 𝐾) ∣ ∀𝑠𝑋 ((𝑠0) = (𝑓𝑠) ∧ (𝑠1) = (𝑔𝑠))}):((𝐽 Cn 𝐾) × (𝐽 Cn 𝐾))⟶𝒫 ((𝐽 ×t II) Cn 𝐾)
30 ovex 6718 . . . . . . . 8 (𝐽 Cn 𝐾) ∈ V
3130, 30xpex 7004 . . . . . . 7 ((𝐽 Cn 𝐾) × (𝐽 Cn 𝐾)) ∈ V
3223pwex 4878 . . . . . . 7 𝒫 ((𝐽 ×t II) Cn 𝐾) ∈ V
33 fex2 7163 . . . . . . 7 (((𝑓 ∈ (𝐽 Cn 𝐾), 𝑔 ∈ (𝐽 Cn 𝐾) ↦ { ∈ ((𝐽 ×t II) Cn 𝐾) ∣ ∀𝑠𝑋 ((𝑠0) = (𝑓𝑠) ∧ (𝑠1) = (𝑔𝑠))}):((𝐽 Cn 𝐾) × (𝐽 Cn 𝐾))⟶𝒫 ((𝐽 ×t II) Cn 𝐾) ∧ ((𝐽 Cn 𝐾) × (𝐽 Cn 𝐾)) ∈ V ∧ 𝒫 ((𝐽 ×t II) Cn 𝐾) ∈ V) → (𝑓 ∈ (𝐽 Cn 𝐾), 𝑔 ∈ (𝐽 Cn 𝐾) ↦ { ∈ ((𝐽 ×t II) Cn 𝐾) ∣ ∀𝑠𝑋 ((𝑠0) = (𝑓𝑠) ∧ (𝑠1) = (𝑔𝑠))}) ∈ V)
3429, 31, 32, 33mp3an 1464 . . . . . 6 (𝑓 ∈ (𝐽 Cn 𝐾), 𝑔 ∈ (𝐽 Cn 𝐾) ↦ { ∈ ((𝐽 ×t II) Cn 𝐾) ∣ ∀𝑠𝑋 ((𝑠0) = (𝑓𝑠) ∧ (𝑠1) = (𝑔𝑠))}) ∈ V
3534a1i 11 . . . . 5 (𝜑 → (𝑓 ∈ (𝐽 Cn 𝐾), 𝑔 ∈ (𝐽 Cn 𝐾) ↦ { ∈ ((𝐽 ×t II) Cn 𝐾) ∣ ∀𝑠𝑋 ((𝑠0) = (𝑓𝑠) ∧ (𝑠1) = (𝑔𝑠))}) ∈ V)
362, 16, 18, 21, 35ovmpt2d 6830 . . . 4 (𝜑 → (𝐽 Htpy 𝐾) = (𝑓 ∈ (𝐽 Cn 𝐾), 𝑔 ∈ (𝐽 Cn 𝐾) ↦ { ∈ ((𝐽 ×t II) Cn 𝐾) ∣ ∀𝑠𝑋 ((𝑠0) = (𝑓𝑠) ∧ (𝑠1) = (𝑔𝑠))}))
37 fveq1 6228 . . . . . . . . 9 (𝑓 = 𝐹 → (𝑓𝑠) = (𝐹𝑠))
3837eqeq2d 2661 . . . . . . . 8 (𝑓 = 𝐹 → ((𝑠0) = (𝑓𝑠) ↔ (𝑠0) = (𝐹𝑠)))
39 fveq1 6228 . . . . . . . . 9 (𝑔 = 𝐺 → (𝑔𝑠) = (𝐺𝑠))
4039eqeq2d 2661 . . . . . . . 8 (𝑔 = 𝐺 → ((𝑠1) = (𝑔𝑠) ↔ (𝑠1) = (𝐺𝑠)))
4138, 40bi2anan9 935 . . . . . . 7 ((𝑓 = 𝐹𝑔 = 𝐺) → (((𝑠0) = (𝑓𝑠) ∧ (𝑠1) = (𝑔𝑠)) ↔ ((𝑠0) = (𝐹𝑠) ∧ (𝑠1) = (𝐺𝑠))))
4241adantl 481 . . . . . 6 ((𝜑 ∧ (𝑓 = 𝐹𝑔 = 𝐺)) → (((𝑠0) = (𝑓𝑠) ∧ (𝑠1) = (𝑔𝑠)) ↔ ((𝑠0) = (𝐹𝑠) ∧ (𝑠1) = (𝐺𝑠))))
4342ralbidv 3015 . . . . 5 ((𝜑 ∧ (𝑓 = 𝐹𝑔 = 𝐺)) → (∀𝑠𝑋 ((𝑠0) = (𝑓𝑠) ∧ (𝑠1) = (𝑔𝑠)) ↔ ∀𝑠𝑋 ((𝑠0) = (𝐹𝑠) ∧ (𝑠1) = (𝐺𝑠))))
4443rabbidv 3220 . . . 4 ((𝜑 ∧ (𝑓 = 𝐹𝑔 = 𝐺)) → { ∈ ((𝐽 ×t II) Cn 𝐾) ∣ ∀𝑠𝑋 ((𝑠0) = (𝑓𝑠) ∧ (𝑠1) = (𝑔𝑠))} = { ∈ ((𝐽 ×t II) Cn 𝐾) ∣ ∀𝑠𝑋 ((𝑠0) = (𝐹𝑠) ∧ (𝑠1) = (𝐺𝑠))})
45 ishtpy.4 . . . 4 (𝜑𝐺 ∈ (𝐽 Cn 𝐾))
4623rabex 4845 . . . . 5 { ∈ ((𝐽 ×t II) Cn 𝐾) ∣ ∀𝑠𝑋 ((𝑠0) = (𝐹𝑠) ∧ (𝑠1) = (𝐺𝑠))} ∈ V
4746a1i 11 . . . 4 (𝜑 → { ∈ ((𝐽 ×t II) Cn 𝐾) ∣ ∀𝑠𝑋 ((𝑠0) = (𝐹𝑠) ∧ (𝑠1) = (𝐺𝑠))} ∈ V)
4836, 44, 19, 45, 47ovmpt2d 6830 . . 3 (𝜑 → (𝐹(𝐽 Htpy 𝐾)𝐺) = { ∈ ((𝐽 ×t II) Cn 𝐾) ∣ ∀𝑠𝑋 ((𝑠0) = (𝐹𝑠) ∧ (𝑠1) = (𝐺𝑠))})
4948eleq2d 2716 . 2 (𝜑 → (𝐻 ∈ (𝐹(𝐽 Htpy 𝐾)𝐺) ↔ 𝐻 ∈ { ∈ ((𝐽 ×t II) Cn 𝐾) ∣ ∀𝑠𝑋 ((𝑠0) = (𝐹𝑠) ∧ (𝑠1) = (𝐺𝑠))}))
50 oveq 6696 . . . . . 6 ( = 𝐻 → (𝑠0) = (𝑠𝐻0))
5150eqeq1d 2653 . . . . 5 ( = 𝐻 → ((𝑠0) = (𝐹𝑠) ↔ (𝑠𝐻0) = (𝐹𝑠)))
52 oveq 6696 . . . . . 6 ( = 𝐻 → (𝑠1) = (𝑠𝐻1))
5352eqeq1d 2653 . . . . 5 ( = 𝐻 → ((𝑠1) = (𝐺𝑠) ↔ (𝑠𝐻1) = (𝐺𝑠)))
5451, 53anbi12d 747 . . . 4 ( = 𝐻 → (((𝑠0) = (𝐹𝑠) ∧ (𝑠1) = (𝐺𝑠)) ↔ ((𝑠𝐻0) = (𝐹𝑠) ∧ (𝑠𝐻1) = (𝐺𝑠))))
5554ralbidv 3015 . . 3 ( = 𝐻 → (∀𝑠𝑋 ((𝑠0) = (𝐹𝑠) ∧ (𝑠1) = (𝐺𝑠)) ↔ ∀𝑠𝑋 ((𝑠𝐻0) = (𝐹𝑠) ∧ (𝑠𝐻1) = (𝐺𝑠))))
5655elrab 3396 . 2 (𝐻 ∈ { ∈ ((𝐽 ×t II) Cn 𝐾) ∣ ∀𝑠𝑋 ((𝑠0) = (𝐹𝑠) ∧ (𝑠1) = (𝐺𝑠))} ↔ (𝐻 ∈ ((𝐽 ×t II) Cn 𝐾) ∧ ∀𝑠𝑋 ((𝑠𝐻0) = (𝐹𝑠) ∧ (𝑠𝐻1) = (𝐺𝑠))))
5749, 56syl6bb 276 1 (𝜑 → (𝐻 ∈ (𝐹(𝐽 Htpy 𝐾)𝐺) ↔ (𝐻 ∈ ((𝐽 ×t II) Cn 𝐾) ∧ ∀𝑠𝑋 ((𝑠𝐻0) = (𝐹𝑠) ∧ (𝑠𝐻1) = (𝐺𝑠)))))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 196  wa 383   = wceq 1523  wcel 2030  wral 2941  {crab 2945  Vcvv 3231  wss 3607  𝒫 cpw 4191   cuni 4468   × cxp 5141  wf 5922  cfv 5926  (class class class)co 6690  cmpt2 6692  0cc0 9974  1c1 9975  Topctop 20746  TopOnctopon 20763   Cn ccn 21076   ×t ctx 21411  IIcii 22725   Htpy chtpy 22813
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1762  ax-4 1777  ax-5 1879  ax-6 1945  ax-7 1981  ax-8 2032  ax-9 2039  ax-10 2059  ax-11 2074  ax-12 2087  ax-13 2282  ax-ext 2631  ax-sep 4814  ax-nul 4822  ax-pow 4873  ax-pr 4936  ax-un 6991
This theorem depends on definitions:  df-bi 197  df-or 384  df-an 385  df-3an 1056  df-tru 1526  df-ex 1745  df-nf 1750  df-sb 1938  df-eu 2502  df-mo 2503  df-clab 2638  df-cleq 2644  df-clel 2647  df-nfc 2782  df-ne 2824  df-ral 2946  df-rex 2947  df-rab 2950  df-v 3233  df-sbc 3469  df-csb 3567  df-dif 3610  df-un 3612  df-in 3614  df-ss 3621  df-nul 3949  df-if 4120  df-pw 4193  df-sn 4211  df-pr 4213  df-op 4217  df-uni 4469  df-iun 4554  df-br 4686  df-opab 4746  df-mpt 4763  df-id 5053  df-xp 5149  df-rel 5150  df-cnv 5151  df-co 5152  df-dm 5153  df-rn 5154  df-res 5155  df-ima 5156  df-iota 5889  df-fun 5928  df-fn 5929  df-f 5930  df-fv 5934  df-ov 6693  df-oprab 6694  df-mpt2 6695  df-1st 7210  df-2nd 7211  df-map 7901  df-top 20747  df-topon 20764  df-cn 21079  df-htpy 22816
This theorem is referenced by:  htpycn  22819  htpyi  22820  ishtpyd  22821
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