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Theorem tpf 14426
Description: A function into a (proper) triple. (Contributed by AV, 20-Jul-2025.)
Hypotheses
Ref Expression
tpf1o.f 𝐹 = (𝑥 ∈ (0..^3) ↦ if(𝑥 = 0, 𝐴, if(𝑥 = 1, 𝐵, 𝐶)))
tpf.t 𝑇 = {𝐴, 𝐵, 𝐶}
Assertion
Ref Expression
tpf ((𝐴𝑉𝐵𝑉𝐶𝑉) → 𝐹:(0..^3)⟶𝑇)
Distinct variable groups:   𝑥,𝐴   𝑥,𝑉   𝑥,𝐵   𝑥,𝐶   𝑥,𝑇
Allowed substitution hint:   𝐹(𝑥)

Proof of Theorem tpf
StepHypRef Expression
1 tpid1g 4727 . . . . . 6 (𝐴𝑉𝐴 ∈ {𝐴, 𝐵, 𝐶})
213ad2ant1 1134 . . . . 5 ((𝐴𝑉𝐵𝑉𝐶𝑉) → 𝐴 ∈ {𝐴, 𝐵, 𝐶})
3 tpid2g 4729 . . . . . . 7 (𝐵𝑉𝐵 ∈ {𝐴, 𝐵, 𝐶})
433ad2ant2 1135 . . . . . 6 ((𝐴𝑉𝐵𝑉𝐶𝑉) → 𝐵 ∈ {𝐴, 𝐵, 𝐶})
5 tpid3g 4730 . . . . . . 7 (𝐶𝑉𝐶 ∈ {𝐴, 𝐵, 𝐶})
653ad2ant3 1136 . . . . . 6 ((𝐴𝑉𝐵𝑉𝐶𝑉) → 𝐶 ∈ {𝐴, 𝐵, 𝐶})
74, 6ifcld 4527 . . . . 5 ((𝐴𝑉𝐵𝑉𝐶𝑉) → if(𝑥 = 1, 𝐵, 𝐶) ∈ {𝐴, 𝐵, 𝐶})
82, 7ifcld 4527 . . . 4 ((𝐴𝑉𝐵𝑉𝐶𝑉) → if(𝑥 = 0, 𝐴, if(𝑥 = 1, 𝐵, 𝐶)) ∈ {𝐴, 𝐵, 𝐶})
9 tpf.t . . . 4 𝑇 = {𝐴, 𝐵, 𝐶}
108, 9eleqtrrdi 2848 . . 3 ((𝐴𝑉𝐵𝑉𝐶𝑉) → if(𝑥 = 0, 𝐴, if(𝑥 = 1, 𝐵, 𝐶)) ∈ 𝑇)
1110adantr 480 . 2 (((𝐴𝑉𝐵𝑉𝐶𝑉) ∧ 𝑥 ∈ (0..^3)) → if(𝑥 = 0, 𝐴, if(𝑥 = 1, 𝐵, 𝐶)) ∈ 𝑇)
12 tpf1o.f . 2 𝐹 = (𝑥 ∈ (0..^3) ↦ if(𝑥 = 0, 𝐴, if(𝑥 = 1, 𝐵, 𝐶)))
1311, 12fmptd 7061 1 ((𝐴𝑉𝐵𝑉𝐶𝑉) → 𝐹:(0..^3)⟶𝑇)
Colors of variables: wff setvar class
Syntax hints:  wi 4  w3a 1087   = wceq 1542  wcel 2114  ifcif 4480  {ctp 4585  cmpt 5180  wf 6489  (class class class)co 7360  0cc0 11030  1c1 11031  3c3 12205  ..^cfzo 13574
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 1912  ax-6 1969  ax-7 2010  ax-8 2116  ax-9 2124  ax-10 2147  ax-11 2163  ax-12 2185  ax-ext 2709  ax-sep 5242  ax-nul 5252  ax-pr 5378
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 849  df-3or 1088  df-3an 1089  df-tru 1545  df-fal 1555  df-ex 1782  df-nf 1786  df-sb 2069  df-mo 2540  df-eu 2570  df-clab 2716  df-cleq 2729  df-clel 2812  df-nfc 2886  df-ral 3053  df-rex 3062  df-rab 3401  df-v 3443  df-dif 3905  df-un 3907  df-in 3909  df-ss 3919  df-nul 4287  df-if 4481  df-sn 4582  df-pr 4584  df-tp 4586  df-op 4588  df-br 5100  df-opab 5162  df-mpt 5181  df-id 5520  df-xp 5631  df-rel 5632  df-cnv 5633  df-co 5634  df-dm 5635  df-rn 5636  df-res 5637  df-ima 5638  df-fun 6495  df-fn 6496  df-f 6497
This theorem is referenced by:  tpfo  14427
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