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Theorem tpf 14566
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 4733 . . . . . 6 (𝐴𝑉𝐴 ∈ {𝐴, 𝐵, 𝐶})
213ad2ant1 1151 . . . . 5 ((𝐴𝑉𝐵𝑉𝐶𝑉) → 𝐴 ∈ {𝐴, 𝐵, 𝐶})
3 tpid2g 4735 . . . . . . 7 (𝐵𝑉𝐵 ∈ {𝐴, 𝐵, 𝐶})
433ad2ant2 1152 . . . . . 6 ((𝐴𝑉𝐵𝑉𝐶𝑉) → 𝐵 ∈ {𝐴, 𝐵, 𝐶})
5 tpid3g 4736 . . . . . . 7 (𝐶𝑉𝐶 ∈ {𝐴, 𝐵, 𝐶})
653ad2ant3 1153 . . . . . 6 ((𝐴𝑉𝐵𝑉𝐶𝑉) → 𝐶 ∈ {𝐴, 𝐵, 𝐶})
74, 6ifcld 4532 . . . . 5 ((𝐴𝑉𝐵𝑉𝐶𝑉) → if(𝑥 = 1, 𝐵, 𝐶) ∈ {𝐴, 𝐵, 𝐶})
82, 7ifcld 4532 . . . 4 ((𝐴𝑉𝐵𝑉𝐶𝑉) → if(𝑥 = 0, 𝐴, if(𝑥 = 1, 𝐵, 𝐶)) ∈ {𝐴, 𝐵, 𝐶})
9 tpf.t . . . 4 𝑇 = {𝐴, 𝐵, 𝐶}
108, 9eleqtrrdi 2873 . . 3 ((𝐴𝑉𝐵𝑉𝐶𝑉) → if(𝑥 = 0, 𝐴, if(𝑥 = 1, 𝐵, 𝐶)) ∈ 𝑇)
1110adantr 486 . 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 7110 1 ((𝐴𝑉𝐵𝑉𝐶𝑉) → 𝐹:(0..^3)⟶𝑇)
Colors of variables:    wff setvar class
This proof depends on syntax axioms:  wi 4  w3a 1103   = wceq 1570  wcel 2145  ifcif 4485  {ctp 4591  cmpt 5190  wf 6533  (class class class)co 7416  0cc0 11127  1c1 11128  3c3 12323  ..^cfzo 13711
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1943  ax-6 2000  ax-7 2041  ax-8 2147  ax-9 2155  ax-10 2178  ax-11 2194  ax-12 2215  ax-ext 2734  ax-sep 5255  ax-pr 5402
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3or 1104  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-nf 1817  df-sb 2100  df-mo 2566  df-eu 2596  df-clab 2741  df-cleq 2754  df-clel 2837  df-nfc 2911  df-ral 3079  df-rex 3089  df-rab 3415  df-v 3455  df-dif 3905  df-un 3907  df-in 3909  df-ss 3919  df-nul 4283  df-if 4486  df-sn 4588  df-pr 4590  df-tp 4592  df-op 4594  df-br 5108  df-opab 5172  df-mpt 5191  df-id 5554  df-xp 5665  df-rel 5666  df-cnv 5667  df-co 5668  df-dm 5669  df-rn 5670  df-res 5671  df-ima 5672  df-fun 6539  df-fn 6540  df-f 6541
This theorem is used by:  tpfo  14567
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