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Theorem p1val 18486
Description: Value of poset zero. (Contributed by NM, 22-Oct-2011.)
Hypotheses
Ref Expression
p1val.b 𝐵 = (Base‘𝐾)
p1val.u 𝑈 = (lub‘𝐾)
p1val.t 1 = (1.‘𝐾)
Assertion
Ref Expression
p1val (𝐾𝑉1 = (𝑈𝐵))

Proof of Theorem p1val
Dummy variable 𝑘 is distinct from all other variables.
StepHypRef Expression
1 elex 3499 . 2 (𝐾𝑉𝐾 ∈ V)
2 p1val.t . . 3 1 = (1.‘𝐾)
3 fveq2 6907 . . . . . 6 (𝑘 = 𝐾 → (lub‘𝑘) = (lub‘𝐾))
4 p1val.u . . . . . 6 𝑈 = (lub‘𝐾)
53, 4eqtr4di 2793 . . . . 5 (𝑘 = 𝐾 → (lub‘𝑘) = 𝑈)
6 fveq2 6907 . . . . . 6 (𝑘 = 𝐾 → (Base‘𝑘) = (Base‘𝐾))
7 p1val.b . . . . . 6 𝐵 = (Base‘𝐾)
86, 7eqtr4di 2793 . . . . 5 (𝑘 = 𝐾 → (Base‘𝑘) = 𝐵)
95, 8fveq12d 6914 . . . 4 (𝑘 = 𝐾 → ((lub‘𝑘)‘(Base‘𝑘)) = (𝑈𝐵))
10 df-p1 18484 . . . 4 1. = (𝑘 ∈ V ↦ ((lub‘𝑘)‘(Base‘𝑘)))
11 fvex 6920 . . . 4 (𝑈𝐵) ∈ V
129, 10, 11fvmpt 7016 . . 3 (𝐾 ∈ V → (1.‘𝐾) = (𝑈𝐵))
132, 12eqtrid 2787 . 2 (𝐾 ∈ V → 1 = (𝑈𝐵))
141, 13syl 17 1 (𝐾𝑉1 = (𝑈𝐵))
Colors of variables: wff setvar class
Syntax hints:  wi 4   = wceq 1537  wcel 2106  Vcvv 3478  cfv 6563  Basecbs 17245  lubclub 18367  1.cp1 18482
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-pr 5438
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  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-ral 3060  df-rex 3069  df-rab 3434  df-v 3480  df-dif 3966  df-un 3968  df-ss 3980  df-nul 4340  df-if 4532  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-xp 5695  df-rel 5696  df-cnv 5697  df-co 5698  df-dm 5699  df-iota 6516  df-fun 6565  df-fv 6571  df-p1 18484
This theorem is referenced by:  ple1  18488  clatp1cl  32952  xrsp1  32998  op1cl  39167
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