HomeHome Metamath Proof Explorer < Previous   Next >
Related theorems
Unicode version

Theorem dmresi 3399
Description: The domain of a restricted identity function.
Assertion
Ref Expression
dmresi |- dom ( I |` A) = A

Proof of Theorem dmresi
StepHypRef Expression
1 ssv 2081 . . 3 |- A (_ V
2 dmi 3326 . . 3 |- dom I = V
31, 2sseqtr4 2094 . 2 |- A (_ dom I
4 ssdmres 3381 . 2 |- (A (_ dom I <-> dom ( I |` A) = A)
53, 4mpbi 189 1 |- dom ( I |` A) = A
Colors of variables: wff set class
Syntax hints:   = wceq 956  Vcvv 1811   (_ wss 2047  Icid 2831  dom cdm 3170   |` cres 3172
This theorem is referenced by:  fnresi 3603
This theorem was proved from axioms:  ax-1 4  ax-2 5  ax-3 6  ax-mp 7  ax-7 962  ax-gen 963  ax-8 964  ax-9 965  ax-10 966  ax-11 967  ax-12 968  ax-13 969  ax-14 970  ax-17 971  ax-4 973  ax-5o 975  ax-6o 978  ax-9o 1123  ax-10o 1140  ax-16 1210  ax-11o 1218  ax-ext 1459  ax-sep 2703  ax-pow 2742  ax-pr 2779
This theorem depends on definitions:  df-bi 147  df-or 224  df-an 225  df-ex 981  df-sb 1172  df-eu 1382  df-mo 1383  df-clab 1464  df-cleq 1469  df-clel 1472  df-ne 1587  df-v 1812  df-dif 2049  df-un 2050  df-in 2051  df-ss 2053  df-nul 2281  df-pw 2402  df-sn 2412  df-pr 2413  df-op 2416  df-br 2620  df-opab 2667  df-id 2835  df-xp 3184  df-rel 3185  df-dm 3188  df-res 3190
Copyright terms: Public domain