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Theorem rnfdmpr 40594
Description: The range of a one-to-one function 𝐹 of an unordered pair into a set is the unordered pair of the function values. (Contributed by Alexander van der Vekens, 2-Feb-2018.)
Assertion
Ref Expression
rnfdmpr ((𝑋𝑉𝑌𝑊) → (𝐹 Fn {𝑋, 𝑌} → ran 𝐹 = {(𝐹𝑋), (𝐹𝑌)}))

Proof of Theorem rnfdmpr
Dummy variables 𝑥 𝑖 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 fnrnfv 6199 . . . 4 (𝐹 Fn {𝑋, 𝑌} → ran 𝐹 = {𝑥 ∣ ∃𝑖 ∈ {𝑋, 𝑌}𝑥 = (𝐹𝑖)})
21adantl 482 . . 3 (((𝑋𝑉𝑌𝑊) ∧ 𝐹 Fn {𝑋, 𝑌}) → ran 𝐹 = {𝑥 ∣ ∃𝑖 ∈ {𝑋, 𝑌}𝑥 = (𝐹𝑖)})
3 fveq2 6148 . . . . . . . 8 (𝑖 = 𝑋 → (𝐹𝑖) = (𝐹𝑋))
43eqeq2d 2631 . . . . . . 7 (𝑖 = 𝑋 → (𝑥 = (𝐹𝑖) ↔ 𝑥 = (𝐹𝑋)))
54abbidv 2738 . . . . . 6 (𝑖 = 𝑋 → {𝑥𝑥 = (𝐹𝑖)} = {𝑥𝑥 = (𝐹𝑋)})
6 fveq2 6148 . . . . . . . 8 (𝑖 = 𝑌 → (𝐹𝑖) = (𝐹𝑌))
76eqeq2d 2631 . . . . . . 7 (𝑖 = 𝑌 → (𝑥 = (𝐹𝑖) ↔ 𝑥 = (𝐹𝑌)))
87abbidv 2738 . . . . . 6 (𝑖 = 𝑌 → {𝑥𝑥 = (𝐹𝑖)} = {𝑥𝑥 = (𝐹𝑌)})
95, 8iunxprg 4573 . . . . 5 ((𝑋𝑉𝑌𝑊) → 𝑖 ∈ {𝑋, 𝑌} {𝑥𝑥 = (𝐹𝑖)} = ({𝑥𝑥 = (𝐹𝑋)} ∪ {𝑥𝑥 = (𝐹𝑌)}))
109adantr 481 . . . 4 (((𝑋𝑉𝑌𝑊) ∧ 𝐹 Fn {𝑋, 𝑌}) → 𝑖 ∈ {𝑋, 𝑌} {𝑥𝑥 = (𝐹𝑖)} = ({𝑥𝑥 = (𝐹𝑋)} ∪ {𝑥𝑥 = (𝐹𝑌)}))
11 iunab 4532 . . . 4 𝑖 ∈ {𝑋, 𝑌} {𝑥𝑥 = (𝐹𝑖)} = {𝑥 ∣ ∃𝑖 ∈ {𝑋, 𝑌}𝑥 = (𝐹𝑖)}
12 df-sn 4149 . . . . . . 7 {(𝐹𝑋)} = {𝑥𝑥 = (𝐹𝑋)}
1312eqcomi 2630 . . . . . 6 {𝑥𝑥 = (𝐹𝑋)} = {(𝐹𝑋)}
14 df-sn 4149 . . . . . . 7 {(𝐹𝑌)} = {𝑥𝑥 = (𝐹𝑌)}
1514eqcomi 2630 . . . . . 6 {𝑥𝑥 = (𝐹𝑌)} = {(𝐹𝑌)}
1613, 15uneq12i 3743 . . . . 5 ({𝑥𝑥 = (𝐹𝑋)} ∪ {𝑥𝑥 = (𝐹𝑌)}) = ({(𝐹𝑋)} ∪ {(𝐹𝑌)})
17 df-pr 4151 . . . . 5 {(𝐹𝑋), (𝐹𝑌)} = ({(𝐹𝑋)} ∪ {(𝐹𝑌)})
1816, 17eqtr4i 2646 . . . 4 ({𝑥𝑥 = (𝐹𝑋)} ∪ {𝑥𝑥 = (𝐹𝑌)}) = {(𝐹𝑋), (𝐹𝑌)}
1910, 11, 183eqtr3g 2678 . . 3 (((𝑋𝑉𝑌𝑊) ∧ 𝐹 Fn {𝑋, 𝑌}) → {𝑥 ∣ ∃𝑖 ∈ {𝑋, 𝑌}𝑥 = (𝐹𝑖)} = {(𝐹𝑋), (𝐹𝑌)})
202, 19eqtrd 2655 . 2 (((𝑋𝑉𝑌𝑊) ∧ 𝐹 Fn {𝑋, 𝑌}) → ran 𝐹 = {(𝐹𝑋), (𝐹𝑌)})
2120ex 450 1 ((𝑋𝑉𝑌𝑊) → (𝐹 Fn {𝑋, 𝑌} → ran 𝐹 = {(𝐹𝑋), (𝐹𝑌)}))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 384   = wceq 1480  wcel 1987  {cab 2607  wrex 2908  cun 3553  {csn 4148  {cpr 4150   ciun 4485  ran crn 5075   Fn wfn 5842  cfv 5847
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1719  ax-4 1734  ax-5 1836  ax-6 1885  ax-7 1932  ax-9 1996  ax-10 2016  ax-11 2031  ax-12 2044  ax-13 2245  ax-ext 2601  ax-sep 4741  ax-nul 4749  ax-pr 4867
This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3an 1038  df-tru 1483  df-ex 1702  df-nf 1707  df-sb 1878  df-eu 2473  df-mo 2474  df-clab 2608  df-cleq 2614  df-clel 2617  df-nfc 2750  df-ral 2912  df-rex 2913  df-rab 2916  df-v 3188  df-sbc 3418  df-dif 3558  df-un 3560  df-in 3562  df-ss 3569  df-nul 3892  df-if 4059  df-sn 4149  df-pr 4151  df-op 4155  df-uni 4403  df-iun 4487  df-br 4614  df-opab 4674  df-mpt 4675  df-id 4989  df-xp 5080  df-rel 5081  df-cnv 5082  df-co 5083  df-dm 5084  df-rn 5085  df-iota 5810  df-fun 5849  df-fn 5850  df-fv 5855
This theorem is referenced by:  imarnf1pr  40595
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