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Theorem imain 6634
Description: The image of an intersection is the intersection of images. (Contributed by Paul Chapman, 11-Apr-2009.)
Assertion
Ref Expression
imain (Fun 𝐹 → (𝐹 “ (𝐴𝐵)) = ((𝐹𝐴) ∩ (𝐹𝐵)))

Proof of Theorem imain
StepHypRef Expression
1 imadif 6633 . . 3 (Fun 𝐹 → (𝐹 “ (𝐴 ∖ (𝐴𝐵))) = ((𝐹𝐴) ∖ (𝐹 “ (𝐴𝐵))))
2 imadif 6633 . . . 4 (Fun 𝐹 → (𝐹 “ (𝐴𝐵)) = ((𝐹𝐴) ∖ (𝐹𝐵)))
32difeq2d 4123 . . 3 (Fun 𝐹 → ((𝐹𝐴) ∖ (𝐹 “ (𝐴𝐵))) = ((𝐹𝐴) ∖ ((𝐹𝐴) ∖ (𝐹𝐵))))
41, 3eqtrd 2773 . 2 (Fun 𝐹 → (𝐹 “ (𝐴 ∖ (𝐴𝐵))) = ((𝐹𝐴) ∖ ((𝐹𝐴) ∖ (𝐹𝐵))))
5 dfin4 4268 . . 3 (𝐴𝐵) = (𝐴 ∖ (𝐴𝐵))
65imaeq2i 6058 . 2 (𝐹 “ (𝐴𝐵)) = (𝐹 “ (𝐴 ∖ (𝐴𝐵)))
7 dfin4 4268 . 2 ((𝐹𝐴) ∩ (𝐹𝐵)) = ((𝐹𝐴) ∖ ((𝐹𝐴) ∖ (𝐹𝐵)))
84, 6, 73eqtr4g 2798 1 (Fun 𝐹 → (𝐹 “ (𝐴𝐵)) = ((𝐹𝐴) ∩ (𝐹𝐵)))
Colors of variables: wff setvar class
Syntax hints:  wi 4   = wceq 1542  cdif 3946  cin 3948  ccnv 5676  cima 5680  Fun wfun 6538
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1798  ax-4 1812  ax-5 1914  ax-6 1972  ax-7 2012  ax-8 2109  ax-9 2117  ax-10 2138  ax-12 2172  ax-ext 2704  ax-sep 5300  ax-nul 5307  ax-pr 5428
This theorem depends on definitions:  df-bi 206  df-an 398  df-or 847  df-3an 1090  df-tru 1545  df-fal 1555  df-ex 1783  df-nf 1787  df-sb 2069  df-mo 2535  df-clab 2711  df-cleq 2725  df-clel 2811  df-ral 3063  df-rex 3072  df-rab 3434  df-v 3477  df-dif 3952  df-un 3954  df-in 3956  df-ss 3966  df-nul 4324  df-if 4530  df-sn 4630  df-pr 4632  df-op 4636  df-br 5150  df-opab 5212  df-id 5575  df-xp 5683  df-rel 5684  df-cnv 5685  df-co 5686  df-dm 5687  df-rn 5688  df-res 5689  df-ima 5690  df-fun 6546
This theorem is referenced by:  inpreima  7066  rnelfmlem  23456  fmfnfmlem3  23460  spthispth  28983  swrdrndisj  32121  ballotlemfrc  33525  poimirlem1  36489  poimirlem2  36490  poimirlem3  36491  poimirlem4  36492  poimirlem6  36494  poimirlem7  36495  poimirlem11  36499  poimirlem12  36500  poimirlem16  36504  poimirlem17  36505  poimirlem19  36507  poimirlem20  36508  poimirlem23  36511  poimirlem24  36512  poimirlem25  36513  poimirlem29  36517  poimirlem31  36519
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