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Theorem djucllem 15446
Description: Lemma for djulcl 7117 and djurcl 7118. (Contributed by BJ, 4-Jul-2022.)
Hypotheses
Ref Expression
djucllem.1 𝑋 ∈ V
djucllem.2 𝐹 = (𝑥 ∈ V ↦ ⟨𝑋, 𝑥⟩)
Assertion
Ref Expression
djucllem (𝐴𝐵 → ((𝐹𝐵)‘𝐴) ∈ ({𝑋} × 𝐵))
Distinct variable groups:   𝑥,𝐴   𝑥,𝑋
Allowed substitution hints:   𝐵(𝑥)   𝐹(𝑥)

Proof of Theorem djucllem
StepHypRef Expression
1 fvres 5582 . . 3 (𝐴𝐵 → ((𝐹𝐵)‘𝐴) = (𝐹𝐴))
2 elex 2774 . . . 4 (𝐴𝐵𝐴 ∈ V)
3 djucllem.1 . . . . . 6 𝑋 ∈ V
43snid 3653 . . . . 5 𝑋 ∈ {𝑋}
5 opelxpi 4695 . . . . 5 ((𝑋 ∈ {𝑋} ∧ 𝐴𝐵) → ⟨𝑋, 𝐴⟩ ∈ ({𝑋} × 𝐵))
64, 5mpan 424 . . . 4 (𝐴𝐵 → ⟨𝑋, 𝐴⟩ ∈ ({𝑋} × 𝐵))
7 opeq2 3809 . . . . 5 (𝑥 = 𝐴 → ⟨𝑋, 𝑥⟩ = ⟨𝑋, 𝐴⟩)
8 djucllem.2 . . . . 5 𝐹 = (𝑥 ∈ V ↦ ⟨𝑋, 𝑥⟩)
97, 8fvmptg 5637 . . . 4 ((𝐴 ∈ V ∧ ⟨𝑋, 𝐴⟩ ∈ ({𝑋} × 𝐵)) → (𝐹𝐴) = ⟨𝑋, 𝐴⟩)
102, 6, 9syl2anc 411 . . 3 (𝐴𝐵 → (𝐹𝐴) = ⟨𝑋, 𝐴⟩)
111, 10eqtrd 2229 . 2 (𝐴𝐵 → ((𝐹𝐵)‘𝐴) = ⟨𝑋, 𝐴⟩)
1211, 6eqeltrd 2273 1 (𝐴𝐵 → ((𝐹𝐵)‘𝐴) ∈ ({𝑋} × 𝐵))
Colors of variables: wff set class
Syntax hints:  wi 4   = wceq 1364  wcel 2167  Vcvv 2763  {csn 3622  cop 3625  cmpt 4094   × cxp 4661  cres 4665  cfv 5258
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-14 2170  ax-ext 2178  ax-sep 4151  ax-pow 4207  ax-pr 4242
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-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-res 4675  df-iota 5219  df-fun 5260  df-fv 5266
This theorem is referenced by:  djulclALT  15447  djurclALT  15448
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