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Theorem foimacnv 5169
Description: A reverse version of f1imacnv 5168. (Contributed by Jeff Hankins, 16-Jul-2009.)
Assertion
Ref Expression
foimacnv ((𝐹:𝐴onto𝐵𝐶𝐵) → (𝐹 “ (𝐹𝐶)) = 𝐶)

Proof of Theorem foimacnv
StepHypRef Expression
1 resima 4668 . 2 ((𝐹 ↾ (𝐹𝐶)) “ (𝐹𝐶)) = (𝐹 “ (𝐹𝐶))
2 fofun 5132 . . . . . 6 (𝐹:𝐴onto𝐵 → Fun 𝐹)
32adantr 265 . . . . 5 ((𝐹:𝐴onto𝐵𝐶𝐵) → Fun 𝐹)
4 funcnvres2 4999 . . . . 5 (Fun 𝐹(𝐹𝐶) = (𝐹 ↾ (𝐹𝐶)))
53, 4syl 14 . . . 4 ((𝐹:𝐴onto𝐵𝐶𝐵) → (𝐹𝐶) = (𝐹 ↾ (𝐹𝐶)))
65imaeq1d 4692 . . 3 ((𝐹:𝐴onto𝐵𝐶𝐵) → ((𝐹𝐶) “ (𝐹𝐶)) = ((𝐹 ↾ (𝐹𝐶)) “ (𝐹𝐶)))
7 resss 4660 . . . . . . . . . . 11 (𝐹𝐶) ⊆ 𝐹
8 cnvss 4533 . . . . . . . . . . 11 ((𝐹𝐶) ⊆ 𝐹(𝐹𝐶) ⊆ 𝐹)
97, 8ax-mp 7 . . . . . . . . . 10 (𝐹𝐶) ⊆ 𝐹
10 cnvcnvss 4800 . . . . . . . . . 10 𝐹𝐹
119, 10sstri 2979 . . . . . . . . 9 (𝐹𝐶) ⊆ 𝐹
12 funss 4945 . . . . . . . . 9 ((𝐹𝐶) ⊆ 𝐹 → (Fun 𝐹 → Fun (𝐹𝐶)))
1311, 2, 12mpsyl 63 . . . . . . . 8 (𝐹:𝐴onto𝐵 → Fun (𝐹𝐶))
1413adantr 265 . . . . . . 7 ((𝐹:𝐴onto𝐵𝐶𝐵) → Fun (𝐹𝐶))
15 df-ima 4383 . . . . . . . 8 (𝐹𝐶) = ran (𝐹𝐶)
16 df-rn 4381 . . . . . . . 8 ran (𝐹𝐶) = dom (𝐹𝐶)
1715, 16eqtr2i 2075 . . . . . . 7 dom (𝐹𝐶) = (𝐹𝐶)
1814, 17jctir 300 . . . . . 6 ((𝐹:𝐴onto𝐵𝐶𝐵) → (Fun (𝐹𝐶) ∧ dom (𝐹𝐶) = (𝐹𝐶)))
19 df-fn 4930 . . . . . 6 ((𝐹𝐶) Fn (𝐹𝐶) ↔ (Fun (𝐹𝐶) ∧ dom (𝐹𝐶) = (𝐹𝐶)))
2018, 19sylibr 141 . . . . 5 ((𝐹:𝐴onto𝐵𝐶𝐵) → (𝐹𝐶) Fn (𝐹𝐶))
21 dfdm4 4552 . . . . . 6 dom (𝐹𝐶) = ran (𝐹𝐶)
22 forn 5134 . . . . . . . . . 10 (𝐹:𝐴onto𝐵 → ran 𝐹 = 𝐵)
2322sseq2d 2998 . . . . . . . . 9 (𝐹:𝐴onto𝐵 → (𝐶 ⊆ ran 𝐹𝐶𝐵))
2423biimpar 285 . . . . . . . 8 ((𝐹:𝐴onto𝐵𝐶𝐵) → 𝐶 ⊆ ran 𝐹)
25 df-rn 4381 . . . . . . . 8 ran 𝐹 = dom 𝐹
2624, 25syl6sseq 3016 . . . . . . 7 ((𝐹:𝐴onto𝐵𝐶𝐵) → 𝐶 ⊆ dom 𝐹)
27 ssdmres 4658 . . . . . . 7 (𝐶 ⊆ dom 𝐹 ↔ dom (𝐹𝐶) = 𝐶)
2826, 27sylib 131 . . . . . 6 ((𝐹:𝐴onto𝐵𝐶𝐵) → dom (𝐹𝐶) = 𝐶)
2921, 28syl5eqr 2100 . . . . 5 ((𝐹:𝐴onto𝐵𝐶𝐵) → ran (𝐹𝐶) = 𝐶)
30 df-fo 4933 . . . . 5 ((𝐹𝐶):(𝐹𝐶)–onto𝐶 ↔ ((𝐹𝐶) Fn (𝐹𝐶) ∧ ran (𝐹𝐶) = 𝐶))
3120, 29, 30sylanbrc 402 . . . 4 ((𝐹:𝐴onto𝐵𝐶𝐵) → (𝐹𝐶):(𝐹𝐶)–onto𝐶)
32 foima 5136 . . . 4 ((𝐹𝐶):(𝐹𝐶)–onto𝐶 → ((𝐹𝐶) “ (𝐹𝐶)) = 𝐶)
3331, 32syl 14 . . 3 ((𝐹:𝐴onto𝐵𝐶𝐵) → ((𝐹𝐶) “ (𝐹𝐶)) = 𝐶)
346, 33eqtr3d 2088 . 2 ((𝐹:𝐴onto𝐵𝐶𝐵) → ((𝐹 ↾ (𝐹𝐶)) “ (𝐹𝐶)) = 𝐶)
351, 34syl5eqr 2100 1 ((𝐹:𝐴onto𝐵𝐶𝐵) → (𝐹 “ (𝐹𝐶)) = 𝐶)
Colors of variables: wff set class
Syntax hints:  wi 4  wa 101   = wceq 1257  wss 2942  ccnv 4369  dom cdm 4370  ran crn 4371  cres 4372  cima 4373  Fun wfun 4921   Fn wfn 4922  ontowfo 4925
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 103  ax-ia2 104  ax-ia3 105  ax-io 638  ax-5 1350  ax-7 1351  ax-gen 1352  ax-ie1 1396  ax-ie2 1397  ax-8 1409  ax-10 1410  ax-11 1411  ax-i12 1412  ax-bndl 1413  ax-4 1414  ax-14 1419  ax-17 1433  ax-i9 1437  ax-ial 1441  ax-i5r 1442  ax-ext 2036  ax-sep 3900  ax-pow 3952  ax-pr 3969
This theorem depends on definitions:  df-bi 114  df-3an 896  df-tru 1260  df-nf 1364  df-sb 1660  df-eu 1917  df-mo 1918  df-clab 2041  df-cleq 2047  df-clel 2050  df-nfc 2181  df-ral 2326  df-rex 2327  df-v 2574  df-un 2947  df-in 2949  df-ss 2956  df-pw 3386  df-sn 3406  df-pr 3407  df-op 3409  df-br 3790  df-opab 3844  df-id 4055  df-xp 4376  df-rel 4377  df-cnv 4378  df-co 4379  df-dm 4380  df-rn 4381  df-res 4382  df-ima 4383  df-fun 4929  df-fn 4930  df-f 4931  df-fo 4933
This theorem is referenced by:  f1opw2  5731  fopwdom  6338
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