Theorem imassrn 5079

Description: The image of a class is a subset of its range. Theorem 3.16(xi) of [Monk1] p. 39. (Contributed by NM, 31-Mar-1995.)

Assertion

Ref	Expression
imassrn	⊢ (𝐴 “ 𝐵) ⊆ ran 𝐴

Proof of Theorem imassrn

Dummy variables 𝑥 𝑦 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		exsimpr 1664	. . 3 ⊢ (∃𝑥(𝑥 ∈ 𝐵 ∧ ⟨𝑥, 𝑦⟩ ∈ 𝐴) → ∃𝑥⟨𝑥, 𝑦⟩ ∈ 𝐴)
2	1	ss2abi 3296	. 2 ⊢ {𝑦 ∣ ∃𝑥(𝑥 ∈ 𝐵 ∧ ⟨𝑥, 𝑦⟩ ∈ 𝐴)} ⊆ {𝑦 ∣ ∃𝑥⟨𝑥, 𝑦⟩ ∈ 𝐴}
3		dfima3 5071	. 2 ⊢ (𝐴 “ 𝐵) = {𝑦 ∣ ∃𝑥(𝑥 ∈ 𝐵 ∧ ⟨𝑥, 𝑦⟩ ∈ 𝐴)}
4		dfrn3 4911	. 2 ⊢ ran 𝐴 = {𝑦 ∣ ∃𝑥⟨𝑥, 𝑦⟩ ∈ 𝐴}
5	2, 3, 4	3sstr4i 3265	1 ⊢ (𝐴 “ 𝐵) ⊆ ran 𝐴

Syntax hints:   ∧ wa 104  ∃wex 1538   ∈ wcel 2200  {cab 2215   ⊆ wss 3197  ⟨cop 3669  ran crn 4720   “ cima 4722

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 714  ax-5 1493  ax-7 1494  ax-gen 1495  ax-ie1 1539  ax-ie2 1540  ax-8 1550  ax-10 1551  ax-11 1552  ax-i12 1553  ax-bndl 1555  ax-4 1556  ax-17 1572  ax-i9 1576  ax-ial 1580  ax-i5r 1581  ax-14 2203  ax-ext 2211  ax-sep 4202  ax-pow 4258  ax-pr 4293

This theorem depends on definitions:  df-bi 117  df-3an 1004  df-tru 1398  df-nf 1507  df-sb 1809  df-eu 2080  df-mo 2081  df-clab 2216  df-cleq 2222  df-clel 2225  df-nfc 2361  df-ral 2513  df-rex 2514  df-v 2801  df-un 3201  df-in 3203  df-ss 3210  df-pw 3651  df-sn 3672  df-pr 3673  df-op 3675  df-br 4084  df-opab 4146  df-xp 4725  df-cnv 4727  df-dm 4729  df-rn 4730  df-res 4731  df-ima 4732

This theorem is referenced by:  imaexg  5082  0ima  5088  cnvimass  5091  fimass  5489  fimacnv  5766  f1opw2  6218  smores2  6446  ecss  6731  f1imaen2g  6953  fopwdom  7005  ssenen  7020  phplem4dom  7031  isinfinf  7067  fiintim  7101  sbthlem2  7133  sbthlemi3  7134  sbthlemi5  7136  sbthlemi6  7137  ctssdccl  7286  ctinf  13009  ssnnctlemct  13025  mhmima  13532  cnptoprest2  14922  hmeontr  14995  hmeores  14997  tgqioo  15237  domomsubct  16396