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Theorem elbasfv 16536
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 4249 . 2 (𝑋𝐵 → ¬ 𝐵 = ∅)
2 elbasfv.s . . . . 5 𝑆 = (𝐹𝑍)
3 fvprc 6638 . . . . 5 𝑍 ∈ V → (𝐹𝑍) = ∅)
42, 3syl5eq 2845 . . . 4 𝑍 ∈ V → 𝑆 = ∅)
54fveq2d 6649 . . 3 𝑍 ∈ V → (Base‘𝑆) = (Base‘∅))
6 elbasfv.b . . 3 𝐵 = (Base‘𝑆)
7 base0 16528 . . 3 ∅ = (Base‘∅)
85, 6, 73eqtr4g 2858 . 2 𝑍 ∈ V → 𝐵 = ∅)
91, 8nsyl2 143 1 (𝑋𝐵𝑍 ∈ V)
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4   = wceq 1538  wcel 2111  Vcvv 3441  c0 4243  cfv 6324  Basecbs 16475
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1911  ax-6 1970  ax-7 2015  ax-8 2113  ax-9 2121  ax-10 2142  ax-11 2158  ax-12 2175  ax-ext 2770  ax-sep 5167  ax-nul 5174  ax-pow 5231  ax-pr 5295
This theorem depends on definitions:  df-bi 210  df-an 400  df-or 845  df-3an 1086  df-tru 1541  df-ex 1782  df-nf 1786  df-sb 2070  df-mo 2598  df-eu 2629  df-clab 2777  df-cleq 2791  df-clel 2870  df-nfc 2938  df-ral 3111  df-rex 3112  df-v 3443  df-sbc 3721  df-dif 3884  df-un 3886  df-in 3888  df-ss 3898  df-nul 4244  df-if 4426  df-sn 4526  df-pr 4528  df-op 4532  df-uni 4801  df-br 5031  df-opab 5093  df-mpt 5111  df-id 5425  df-xp 5525  df-rel 5526  df-cnv 5527  df-co 5528  df-dm 5529  df-iota 6283  df-fun 6326  df-fv 6332  df-slot 16479  df-base 16481
This theorem is referenced by:  frmdelbas  18010  symginv  18522  symggen  18590  psgneu  18626  psgnpmtr  18630  frgpcyg  20265  lindfind  20505  coe1sfi  20842  q1pval  24754  r1pval  24757  symgsubg  30781
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