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Theorem basm 12739
Description: A structure whose base is inhabited is inhabited. (Contributed by Jim Kingdon, 14-Jun-2025.)
Hypothesis
Ref Expression
basm.b 𝐵 = (Base‘𝐺)
Assertion
Ref Expression
basm (𝐴𝐵 → ∃𝑗 𝑗𝐺)
Distinct variable group:   𝑗,𝐺
Allowed substitution hints:   𝐴(𝑗)   𝐵(𝑗)

Proof of Theorem basm
StepHypRef Expression
1 id 19 . . 3 (𝐴𝐵𝐴𝐵)
2 basm.b . . . 4 𝐵 = (Base‘𝐺)
3 baseid 12732 . . . . 5 Base = Slot (Base‘ndx)
42basmex 12737 . . . . 5 (𝐴𝐵𝐺 ∈ V)
5 basendxnn 12734 . . . . . 6 (Base‘ndx) ∈ ℕ
65a1i 9 . . . . 5 (𝐴𝐵 → (Base‘ndx) ∈ ℕ)
73, 4, 6strnfvnd 12698 . . . 4 (𝐴𝐵 → (Base‘𝐺) = (𝐺‘(Base‘ndx)))
82, 7eqtrid 2241 . . 3 (𝐴𝐵𝐵 = (𝐺‘(Base‘ndx)))
91, 8eleqtrd 2275 . 2 (𝐴𝐵𝐴 ∈ (𝐺‘(Base‘ndx)))
10 elfvm 5591 . 2 (𝐴 ∈ (𝐺‘(Base‘ndx)) → ∃𝑗 𝑗𝐺)
119, 10syl 14 1 (𝐴𝐵 → ∃𝑗 𝑗𝐺)
Colors of variables: wff set class
Syntax hints:  wi 4   = wceq 1364  wex 1506  wcel 2167  Vcvv 2763  cfv 5258  cn 8990  ndxcnx 12675  Basecbs 12678
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 710  ax-5 1461  ax-7 1462  ax-gen 1463  ax-ie1 1507  ax-ie2 1508  ax-8 1518  ax-10 1519  ax-11 1520  ax-i12 1521  ax-bndl 1523  ax-4 1524  ax-17 1540  ax-i9 1544  ax-ial 1548  ax-i5r 1549  ax-13 2169  ax-14 2170  ax-ext 2178  ax-sep 4151  ax-pow 4207  ax-pr 4242  ax-un 4468  ax-cnex 7970  ax-resscn 7971  ax-1re 7973  ax-addrcl 7976
This theorem depends on definitions:  df-bi 117  df-3an 982  df-tru 1367  df-nf 1475  df-sb 1777  df-eu 2048  df-mo 2049  df-clab 2183  df-cleq 2189  df-clel 2192  df-nfc 2328  df-ral 2480  df-rex 2481  df-v 2765  df-sbc 2990  df-un 3161  df-in 3163  df-ss 3170  df-pw 3607  df-sn 3628  df-pr 3629  df-op 3631  df-uni 3840  df-int 3875  df-br 4034  df-opab 4095  df-mpt 4096  df-id 4328  df-xp 4669  df-rel 4670  df-cnv 4671  df-co 4672  df-dm 4673  df-rn 4674  df-res 4675  df-iota 5219  df-fun 5260  df-fn 5261  df-fv 5266  df-inn 8991  df-ndx 12681  df-slot 12682  df-base 12684
This theorem is referenced by:  relelbasov  12740
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