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Theorem slotm 13467
Description: A structure with an inhabited slot is inhabited. (Contributed by Jim Kingdon, 24-Jul-2026.)
Hypothesis
Ref Expression
slotm.e (𝐸 = Slot (𝐸‘ndx) ∧ (𝐸‘ndx) ∈ ℕ)
Assertion
Ref Expression
slotm (𝐴 ∈ (𝐸‘𝐺) → ∃𝑗 𝑗 ∈ 𝐺)
Distinct variable group:   𝑗,𝐺
Allowed substitution hints:   𝐴(𝑗)   𝐸(𝑗)

Proof of Theorem slotm
StepHypRef Expression
1 id 19 . . 3 (𝐴 ∈ (𝐸‘𝐺) → 𝐴 ∈ (𝐸‘𝐺))
2 slotm.e . . . . 5 (𝐸 = Slot (𝐸‘ndx) ∧ (𝐸‘ndx) ∈ ℕ)
32simpli 111 . . . 4 𝐸 = Slot (𝐸‘ndx)
42slotslfn 13430 . . . . . 6 𝐸 Fn V
5 fnrel 5479 . . . . . 6 (𝐸 Fn V → Rel 𝐸)
64, 5ax-mp 5 . . . . 5 Rel 𝐸
7 relelfvdm 5727 . . . . 5 ((Rel 𝐸 ∧ 𝐴 ∈ (𝐸‘𝐺)) → 𝐺 ∈ dom 𝐸)
86, 7mpan 428 . . . 4 (𝐴 ∈ (𝐸‘𝐺) → 𝐺 ∈ dom 𝐸)
92simpri 113 . . . . 5 (𝐸‘ndx) ∈ ℕ
109a1i 9 . . . 4 (𝐴 ∈ (𝐸‘𝐺) → (𝐸‘ndx) ∈ ℕ)
113, 8, 10strnfvnd 13424 . . 3 (𝐴 ∈ (𝐸‘𝐺) → (𝐸‘𝐺) = (𝐺‘(𝐸‘ndx)))
121, 11eleqtrd 2317 . 2 (𝐴 ∈ (𝐸‘𝐺) → 𝐴 ∈ (𝐺‘(𝐸‘ndx)))
13 elfvm 5729 . 2 (𝐴 ∈ (𝐺‘(𝐸‘ndx)) → ∃𝑗 𝑗 ∈ 𝐺)
1412, 13syl 14 1 (𝐴 ∈ (𝐸‘𝐺) → ∃𝑗 𝑗 ∈ 𝐺)
Colors of variables:    wff set class
This proof depends on syntax axioms:   → wi 4   ∧ wa 104   = wceq 1402  ∃wex 1545   ∈ wcel 2209  Vcvv 2821  dom cdm 4774  Rel wrel 4779   Fn wfn 5372  ‘cfv 5377  ℕcn 9307  ndxcnx 13401  Slot cslot 13403
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-sep 4249  ax-pow 4311  ax-pr 4346  ax-un 4578
This proof depends on definitions:  df-bi 117  df-3an 1011  df-tru 1405  df-nf 1514  df-sb 1816  df-eu 2089  df-mo 2090  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ral 2533  df-rex 2534  df-v 2823  df-sbc 3052  df-un 3224  df-in 3226  df-ss 3233  df-pw 3690  df-sn 3715  df-pr 3716  df-op 3718  df-uni 3936  df-br 4131  df-opab 4193  df-mpt 4194  df-id 4438  df-xp 4780  df-rel 4781  df-cnv 4782  df-co 4783  df-dm 4784  df-rn 4785  df-iota 5337  df-fun 5379  df-fn 5380  df-fv 5385  df-slot 13408
This theorem is used by:  mgpplusg  14306
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