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Theorem fimacnv 5840
Description: The preimage of the codomain of a mapping is the mapping's domain. (Contributed by FL, 25-Jan-2007.)
Assertion
Ref Expression
fimacnv (𝐹:𝐴⟶𝐵 → (◡𝐹 “ 𝐵) = 𝐴)

Proof of Theorem fimacnv
StepHypRef Expression
1 imassrn 5140 . . 3 (◡𝐹 “ 𝐵) ⊆ ran ◡𝐹
2 dfdm4 4975 . . . 4 dom 𝐹 = ran ◡𝐹
3 fdm 5542 . . . . 5 (𝐹:𝐴⟶𝐵 → dom 𝐹 = 𝐴)
4 ssid 3268 . . . . 5 𝐴 ⊆ 𝐴
53, 4eqsstrdi 3300 . . . 4 (𝐹:𝐴⟶𝐵 → dom 𝐹 ⊆ 𝐴)
62, 5eqsstrrid 3295 . . 3 (𝐹:𝐴⟶𝐵 → ran ◡𝐹 ⊆ 𝐴)
71, 6sstrid 3259 . 2 (𝐹:𝐴⟶𝐵 → (◡𝐹 “ 𝐵) ⊆ 𝐴)
8 imassrn 5140 . . . 4 (𝐹 “ 𝐴) ⊆ ran 𝐹
9 frn 5545 . . . 4 (𝐹:𝐴⟶𝐵 → ran 𝐹 ⊆ 𝐵)
108, 9sstrid 3259 . . 3 (𝐹:𝐴⟶𝐵 → (𝐹 “ 𝐴) ⊆ 𝐵)
11 ffun 5539 . . . 4 (𝐹:𝐴⟶𝐵 → Fun 𝐹)
124, 3sseqtrrid 3299 . . . 4 (𝐹:𝐴⟶𝐵 → 𝐴 ⊆ dom 𝐹)
13 funimass3 5828 . . . 4 ((Fun 𝐹 ∧ 𝐴 ⊆ dom 𝐹) → ((𝐹 “ 𝐴) ⊆ 𝐵 ↔ 𝐴 ⊆ (◡𝐹 “ 𝐵)))
1411, 12, 13syl2anc 415 . . 3 (𝐹:𝐴⟶𝐵 → ((𝐹 “ 𝐴) ⊆ 𝐵 ↔ 𝐴 ⊆ (◡𝐹 “ 𝐵)))
1510, 14mpbid 147 . 2 (𝐹:𝐴⟶𝐵 → 𝐴 ⊆ (◡𝐹 “ 𝐵))
167, 15eqssd 3265 1 (𝐹:𝐴⟶𝐵 → (◡𝐹 “ 𝐵) = 𝐴)
Colors of variables:    wff set class
This proof depends on syntax axioms:   → wi 4   ↔ wb 105   = wceq 1402   ⊆ wss 3220  ◡ccnv 4775  dom cdm 4776  ran crn 4777   “ cima 4779  Fun wfun 5374  ⟶wf 5376
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-sep 4251  ax-pow 4313  ax-pr 4348
This proof depends on definitions:  df-bi 117  df-3an 1011  df-tru 1405  df-nf 1514  df-sb 1816  df-eu 2089  df-mo 2090  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ral 2533  df-rex 2534  df-v 2823  df-sbc 3052  df-un 3224  df-in 3226  df-ss 3233  df-pw 3690  df-sn 3715  df-pr 3716  df-op 3718  df-uni 3936  df-br 4132  df-opab 4194  df-id 4440  df-xp 4782  df-rel 4783  df-cnv 4784  df-co 4785  df-dm 4786  df-rn 4787  df-res 4788  df-ima 4789  df-iota 5340  df-fun 5382  df-fn 5383  df-f 5384  df-fv 5388
This theorem is used by:  fmpt  5861  fsuppeq  6491  fsuppeqg  6492  nn0supp  9630  cnclima  15449
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