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Theorem elbasfv 15841
Description: Utility theorem: reverse closure for any structure defined as a function. (Contributed by Stefan O'Rear, 24-Aug-2015.)
Hypotheses
Ref Expression
elbasfv.s 𝑆 = (𝐹𝑍)
elbasfv.b 𝐵 = (Base‘𝑆)
Assertion
Ref Expression
elbasfv (𝑋𝐵𝑍 ∈ V)

Proof of Theorem elbasfv
StepHypRef Expression
1 n0i 3896 . 2 (𝑋𝐵 → ¬ 𝐵 = ∅)
2 elbasfv.s . . . . 5 𝑆 = (𝐹𝑍)
3 fvprc 6142 . . . . 5 𝑍 ∈ V → (𝐹𝑍) = ∅)
42, 3syl5eq 2667 . . . 4 𝑍 ∈ V → 𝑆 = ∅)
54fveq2d 6152 . . 3 𝑍 ∈ V → (Base‘𝑆) = (Base‘∅))
6 elbasfv.b . . 3 𝐵 = (Base‘𝑆)
7 base0 15833 . . 3 ∅ = (Base‘∅)
85, 6, 73eqtr4g 2680 . 2 𝑍 ∈ V → 𝐵 = ∅)
91, 8nsyl2 142 1 (𝑋𝐵𝑍 ∈ V)
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4   = wceq 1480  wcel 1987  Vcvv 3186  c0 3891  cfv 5847  Basecbs 15781
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1719  ax-4 1734  ax-5 1836  ax-6 1885  ax-7 1932  ax-8 1989  ax-9 1996  ax-10 2016  ax-11 2031  ax-12 2044  ax-13 2245  ax-ext 2601  ax-sep 4741  ax-nul 4749  ax-pow 4803  ax-pr 4867
This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3an 1038  df-tru 1483  df-ex 1702  df-nf 1707  df-sb 1878  df-eu 2473  df-mo 2474  df-clab 2608  df-cleq 2614  df-clel 2617  df-nfc 2750  df-ral 2912  df-rex 2913  df-rab 2916  df-v 3188  df-sbc 3418  df-dif 3558  df-un 3560  df-in 3562  df-ss 3569  df-nul 3892  df-if 4059  df-sn 4149  df-pr 4151  df-op 4155  df-uni 4403  df-br 4614  df-opab 4674  df-mpt 4675  df-id 4989  df-xp 5080  df-rel 5081  df-cnv 5082  df-co 5083  df-dm 5084  df-iota 5810  df-fun 5849  df-fv 5855  df-slot 15785  df-base 15786
This theorem is referenced by:  frmdelbas  17311  symginv  17743  symggen  17811  psgneu  17847  psgnpmtr  17851  coe1sfi  19502  frgpcyg  19841  lindfind  20074  q1pval  23817  r1pval  23820
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