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Theorem bj-fununsn2 34549
 Description: Value of a function expressed as a union of a function and a singleton on a couple (with disjoint domain) at the first component of that couple. (Contributed by BJ, 18-Mar-2023.) (Proof modification is discouraged.)
Hypotheses
Ref Expression
bj-fununsn.un (𝜑𝐹 = (𝐺 ∪ {⟨𝐵, 𝐶⟩}))
bj-fununsn2.neldm (𝜑 → ¬ 𝐵 ∈ dom 𝐺)
bj-fununsn2.ex1 (𝜑𝐵𝑉)
bj-fununsn2.ex2 (𝜑𝐶𝑊)
Assertion
Ref Expression
bj-fununsn2 (𝜑 → (𝐹𝐵) = 𝐶)

Proof of Theorem bj-fununsn2
StepHypRef Expression
1 bj-fununsn.un . . . 4 (𝜑𝐹 = (𝐺 ∪ {⟨𝐵, 𝐶⟩}))
2 uncom 4104 . . . 4 (𝐺 ∪ {⟨𝐵, 𝐶⟩}) = ({⟨𝐵, 𝐶⟩} ∪ 𝐺)
31, 2syl6eq 2871 . . 3 (𝜑𝐹 = ({⟨𝐵, 𝐶⟩} ∪ 𝐺))
4 bj-fununsn2.neldm . . 3 (𝜑 → ¬ 𝐵 ∈ dom 𝐺)
53, 4bj-funun 34547 . 2 (𝜑 → (𝐹𝐵) = ({⟨𝐵, 𝐶⟩}‘𝐵))
6 bj-fununsn2.ex1 . . 3 (𝜑𝐵𝑉)
7 bj-fununsn2.ex2 . . 3 (𝜑𝐶𝑊)
8 fvsng 6914 . . 3 ((𝐵𝑉𝐶𝑊) → ({⟨𝐵, 𝐶⟩}‘𝐵) = 𝐶)
96, 7, 8syl2anc 586 . 2 (𝜑 → ({⟨𝐵, 𝐶⟩}‘𝐵) = 𝐶)
105, 9eqtrd 2855 1 (𝜑 → (𝐹𝐵) = 𝐶)
 Colors of variables: wff setvar class Syntax hints:  ¬ wn 3   → wi 4   = wceq 1537   ∈ wcel 2114   ∪ cun 3907  {csn 4539  ⟨cop 4545  dom cdm 5527  ‘cfv 6327 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1911  ax-6 1970  ax-7 2015  ax-8 2116  ax-9 2124  ax-10 2145  ax-11 2161  ax-12 2177  ax-ext 2792  ax-sep 5175  ax-nul 5182  ax-pow 5238  ax-pr 5302 This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3an 1085  df-tru 1540  df-ex 1781  df-nf 1785  df-sb 2070  df-mo 2622  df-eu 2653  df-clab 2799  df-cleq 2813  df-clel 2891  df-nfc 2959  df-ral 3130  df-rex 3131  df-rab 3134  df-v 3472  df-sbc 3749  df-dif 3912  df-un 3914  df-in 3916  df-ss 3926  df-nul 4266  df-if 4440  df-sn 4540  df-pr 4542  df-op 4546  df-uni 4811  df-br 5039  df-opab 5101  df-id 5432  df-xp 5533  df-rel 5534  df-cnv 5535  df-co 5536  df-dm 5537  df-rn 5538  df-res 5539  df-ima 5540  df-iota 6286  df-fun 6329  df-fv 6335 This theorem is referenced by:  bj-fvsnun2  34551  bj-fvmptunsn1  34552
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