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Theorem mptpreima 4911
Description: The preimage of a function in maps-to notation. (Contributed by Stefan O'Rear, 25-Jan-2015.)
Hypothesis
Ref Expression
dmmpt2.1 𝐹 = (𝑥𝐴𝐵)
Assertion
Ref Expression
mptpreima (𝐹𝐶) = {𝑥𝐴𝐵𝐶}
Distinct variable group:   𝑥,𝐶
Allowed substitution hints:   𝐴(𝑥)   𝐵(𝑥)   𝐹(𝑥)

Proof of Theorem mptpreima
Dummy variable 𝑦 is distinct from all other variables.
StepHypRef Expression
1 dmmpt2.1 . . . . . 6 𝐹 = (𝑥𝐴𝐵)
2 df-mpt 3893 . . . . . 6 (𝑥𝐴𝐵) = {⟨𝑥, 𝑦⟩ ∣ (𝑥𝐴𝑦 = 𝐵)}
31, 2eqtri 2108 . . . . 5 𝐹 = {⟨𝑥, 𝑦⟩ ∣ (𝑥𝐴𝑦 = 𝐵)}
43cnveqi 4599 . . . 4 𝐹 = {⟨𝑥, 𝑦⟩ ∣ (𝑥𝐴𝑦 = 𝐵)}
5 cnvopab 4820 . . . 4 {⟨𝑥, 𝑦⟩ ∣ (𝑥𝐴𝑦 = 𝐵)} = {⟨𝑦, 𝑥⟩ ∣ (𝑥𝐴𝑦 = 𝐵)}
64, 5eqtri 2108 . . 3 𝐹 = {⟨𝑦, 𝑥⟩ ∣ (𝑥𝐴𝑦 = 𝐵)}
76imaeq1i 4758 . 2 (𝐹𝐶) = ({⟨𝑦, 𝑥⟩ ∣ (𝑥𝐴𝑦 = 𝐵)} “ 𝐶)
8 df-ima 4441 . . 3 ({⟨𝑦, 𝑥⟩ ∣ (𝑥𝐴𝑦 = 𝐵)} “ 𝐶) = ran ({⟨𝑦, 𝑥⟩ ∣ (𝑥𝐴𝑦 = 𝐵)} ↾ 𝐶)
9 resopab 4743 . . . . 5 ({⟨𝑦, 𝑥⟩ ∣ (𝑥𝐴𝑦 = 𝐵)} ↾ 𝐶) = {⟨𝑦, 𝑥⟩ ∣ (𝑦𝐶 ∧ (𝑥𝐴𝑦 = 𝐵))}
109rneqi 4651 . . . 4 ran ({⟨𝑦, 𝑥⟩ ∣ (𝑥𝐴𝑦 = 𝐵)} ↾ 𝐶) = ran {⟨𝑦, 𝑥⟩ ∣ (𝑦𝐶 ∧ (𝑥𝐴𝑦 = 𝐵))}
11 ancom 262 . . . . . . . . 9 ((𝑦𝐶 ∧ (𝑥𝐴𝑦 = 𝐵)) ↔ ((𝑥𝐴𝑦 = 𝐵) ∧ 𝑦𝐶))
12 anass 393 . . . . . . . . 9 (((𝑥𝐴𝑦 = 𝐵) ∧ 𝑦𝐶) ↔ (𝑥𝐴 ∧ (𝑦 = 𝐵𝑦𝐶)))
1311, 12bitri 182 . . . . . . . 8 ((𝑦𝐶 ∧ (𝑥𝐴𝑦 = 𝐵)) ↔ (𝑥𝐴 ∧ (𝑦 = 𝐵𝑦𝐶)))
1413exbii 1541 . . . . . . 7 (∃𝑦(𝑦𝐶 ∧ (𝑥𝐴𝑦 = 𝐵)) ↔ ∃𝑦(𝑥𝐴 ∧ (𝑦 = 𝐵𝑦𝐶)))
15 19.42v 1834 . . . . . . . 8 (∃𝑦(𝑥𝐴 ∧ (𝑦 = 𝐵𝑦𝐶)) ↔ (𝑥𝐴 ∧ ∃𝑦(𝑦 = 𝐵𝑦𝐶)))
16 df-clel 2084 . . . . . . . . . 10 (𝐵𝐶 ↔ ∃𝑦(𝑦 = 𝐵𝑦𝐶))
1716bicomi 130 . . . . . . . . 9 (∃𝑦(𝑦 = 𝐵𝑦𝐶) ↔ 𝐵𝐶)
1817anbi2i 445 . . . . . . . 8 ((𝑥𝐴 ∧ ∃𝑦(𝑦 = 𝐵𝑦𝐶)) ↔ (𝑥𝐴𝐵𝐶))
1915, 18bitri 182 . . . . . . 7 (∃𝑦(𝑥𝐴 ∧ (𝑦 = 𝐵𝑦𝐶)) ↔ (𝑥𝐴𝐵𝐶))
2014, 19bitri 182 . . . . . 6 (∃𝑦(𝑦𝐶 ∧ (𝑥𝐴𝑦 = 𝐵)) ↔ (𝑥𝐴𝐵𝐶))
2120abbii 2203 . . . . 5 {𝑥 ∣ ∃𝑦(𝑦𝐶 ∧ (𝑥𝐴𝑦 = 𝐵))} = {𝑥 ∣ (𝑥𝐴𝐵𝐶)}
22 rnopab 4670 . . . . 5 ran {⟨𝑦, 𝑥⟩ ∣ (𝑦𝐶 ∧ (𝑥𝐴𝑦 = 𝐵))} = {𝑥 ∣ ∃𝑦(𝑦𝐶 ∧ (𝑥𝐴𝑦 = 𝐵))}
23 df-rab 2368 . . . . 5 {𝑥𝐴𝐵𝐶} = {𝑥 ∣ (𝑥𝐴𝐵𝐶)}
2421, 22, 233eqtr4i 2118 . . . 4 ran {⟨𝑦, 𝑥⟩ ∣ (𝑦𝐶 ∧ (𝑥𝐴𝑦 = 𝐵))} = {𝑥𝐴𝐵𝐶}
2510, 24eqtri 2108 . . 3 ran ({⟨𝑦, 𝑥⟩ ∣ (𝑥𝐴𝑦 = 𝐵)} ↾ 𝐶) = {𝑥𝐴𝐵𝐶}
268, 25eqtri 2108 . 2 ({⟨𝑦, 𝑥⟩ ∣ (𝑥𝐴𝑦 = 𝐵)} “ 𝐶) = {𝑥𝐴𝐵𝐶}
277, 26eqtri 2108 1 (𝐹𝐶) = {𝑥𝐴𝐵𝐶}
Colors of variables: wff set class
Syntax hints:  wa 102   = wceq 1289  wex 1426  wcel 1438  {cab 2074  {crab 2363  {copab 3890  cmpt 3891  ccnv 4427  ran crn 4429  cres 4430  cima 4431
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 104  ax-ia2 105  ax-ia3 106  ax-io 665  ax-5 1381  ax-7 1382  ax-gen 1383  ax-ie1 1427  ax-ie2 1428  ax-8 1440  ax-10 1441  ax-11 1442  ax-i12 1443  ax-bndl 1444  ax-4 1445  ax-14 1450  ax-17 1464  ax-i9 1468  ax-ial 1472  ax-i5r 1473  ax-ext 2070  ax-sep 3949  ax-pow 4001  ax-pr 4027
This theorem depends on definitions:  df-bi 115  df-3an 926  df-tru 1292  df-nf 1395  df-sb 1693  df-eu 1951  df-mo 1952  df-clab 2075  df-cleq 2081  df-clel 2084  df-nfc 2217  df-ral 2364  df-rex 2365  df-rab 2368  df-v 2621  df-un 3001  df-in 3003  df-ss 3010  df-pw 3427  df-sn 3447  df-pr 3448  df-op 3450  df-br 3838  df-opab 3892  df-mpt 3893  df-xp 4434  df-rel 4435  df-cnv 4436  df-dm 4438  df-rn 4439  df-res 4440  df-ima 4441
This theorem is referenced by:  mptiniseg  4912  dmmpt  4913  fmpt  5433  f1oresrab  5447  suppssfv  5834  suppssov1  5835  infrenegsupex  9051
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