Theorem foima 6120

Description: The image of the domain of an onto function. (Contributed by NM, 29-Nov-2002.)

Assertion

Ref	Expression
foima	⊢ (𝐹:𝐴–onto→𝐵 → (𝐹 “ 𝐴) = 𝐵)

Proof of Theorem foima

Step	Hyp	Ref	Expression
1		imadmrn 5476	. 2 ⊢ (𝐹 “ dom 𝐹) = ran 𝐹
2		fof 6115	. . . 4 ⊢ (𝐹:𝐴–onto→𝐵 → 𝐹:𝐴⟶𝐵)
3		fdm 6051	. . . 4 ⊢ (𝐹:𝐴⟶𝐵 → dom 𝐹 = 𝐴)
4	2, 3	syl 17	. . 3 ⊢ (𝐹:𝐴–onto→𝐵 → dom 𝐹 = 𝐴)
5	4	imaeq2d 5466	. 2 ⊢ (𝐹:𝐴–onto→𝐵 → (𝐹 “ dom 𝐹) = (𝐹 “ 𝐴))
6		forn 6118	. 2 ⊢ (𝐹:𝐴–onto→𝐵 → ran 𝐹 = 𝐵)
7	1, 5, 6	3eqtr3a 2680	1 ⊢ (𝐹:𝐴–onto→𝐵 → (𝐹 “ 𝐴) = 𝐵)

Syntax hints:   → wi 4   = wceq 1483  dom cdm 5114  ran crn 5115   “ cima 5117  ⟶wf 5884  –onto→wfo 5886

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-4 1737  ax-5 1839  ax-6 1888  ax-7 1935  ax-9 1999  ax-10 2019  ax-11 2034  ax-12 2047  ax-13 2246  ax-ext 2602  ax-sep 4781  ax-nul 4789  ax-pr 4906

This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3an 1039  df-tru 1486  df-ex 1705  df-nf 1710  df-sb 1881  df-eu 2474  df-mo 2475  df-clab 2609  df-cleq 2615  df-clel 2618  df-nfc 2753  df-ral 2917  df-rex 2918  df-rab 2921  df-v 3202  df-dif 3577  df-un 3579  df-in 3581  df-ss 3588  df-nul 3916  df-if 4087  df-sn 4178  df-pr 4180  df-op 4184  df-br 4654  df-opab 4713  df-xp 5120  df-cnv 5122  df-dm 5124  df-rn 5125  df-res 5126  df-ima 5127  df-fn 5891  df-f 5892  df-fo 5894

This theorem is referenced by:  foimacnv  6154  domunfican  8233  fiint  8237  fodomfi  8239  cantnflt2  8570  cantnfp1lem3  8577  enfin1ai  9206  symgfixelsi  17855  dprdf1o  18431  lmimlbs  20175  cncmp  21195  cmpfi  21211  cnconn  21225  qtopval2  21499  elfm3  21754  rnelfm  21757  fmfnfmlem2  21759  fmfnfm  21762  eupthvdres  27095  pjordi  29032  qtophaus  29903  poimirlem1  33410  poimirlem2  33411  poimirlem3  33412  poimirlem4  33413  poimirlem5  33414  poimirlem6  33415  poimirlem7  33416  poimirlem9  33418  poimirlem10  33419  poimirlem11  33420  poimirlem12  33421  poimirlem14  33423  poimirlem16  33425  poimirlem17  33426  poimirlem19  33428  poimirlem20  33429  poimirlem22  33431  poimirlem23  33432  poimirlem24  33433  poimirlem25  33434  poimirlem29  33438  poimirlem31  33440  ovoliunnfl  33451  voliunnfl  33453  volsupnfl  33454  ismtybndlem  33605  kelac1  37633  gicabl  37669