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Theorem imai 3423
Description: Image under the identity relation. Theorem 3.16(viii) of [Monk1] p. 38.
Assertion
Ref Expression
imai |- (I"A) = A

Proof of Theorem imai
StepHypRef Expression
1 dfima3 3412 . 2 |- (I"A) = {y | E.x(x e. A /\ <.x, y>. e. I)}
2 df-br 2625 . . . . . . . 8 |- (xIy <-> <.x, y>. e. I)
3 visset 1816 . . . . . . . . 9 |- y e. V
43ideq 3283 . . . . . . . 8 |- (xIy <-> x = y)
52, 4bitr3 175 . . . . . . 7 |- (<.x, y>. e. I <-> x = y)
65anbi2i 482 . . . . . 6 |- ((x e. A /\ <.x, y>. e. I) <-> (x e. A /\ x = y))
7 ancom 437 . . . . . 6 |- ((x e. A /\ x = y) <-> (x = y /\ x e. A))
86, 7bitr 173 . . . . 5 |- ((x e. A /\ <.x, y>. e. I) <-> (x = y /\ x e. A))
98exbii 1053 . . . 4 |- (E.x(x e. A /\ <.x, y>. e. I) <-> E.x(x = y /\ x e. A))
10 eleq1 1537 . . . . 5 |- (x = y -> (x e. A <-> y e. A))
113, 10ceqsexv 1838 . . . 4 |- (E.x(x = y /\ x e. A) <-> y e. A)
129, 11bitr 173 . . 3 |- (E.x(x e. A /\ <.x, y>. e. I) <-> y e. A)
1312abbii 1578 . 2 |- {y | E.x(x e. A /\ <.x, y>. e. I)} = {y | y e. A}
14 abid2 1583 . 2 |- {y | y e. A} = A
151, 13, 143eqtr 1502 1 |- (I"A) = A
Colors of variables: wff set class
Syntax hints:   /\ wa 223   = wceq 958   e. wcel 960  E.wex 982  {cab 1466  <.cop 2415   class class class wbr 2624  Icid 2837  "cima 3179
This theorem is referenced by:  rnresi 3424  cnvresid 3575  ecidsn 4293  idcn 7763
This theorem was proved from axioms:  ax-1 4  ax-2 5  ax-3 6  ax-mp 7  ax-7 964  ax-gen 965  ax-8 966  ax-10 968  ax-11 969  ax-12 970  ax-13 971  ax-14 972  ax-17 973  ax-4 975  ax-5o 977  ax-6o 980  ax-9o 1125  ax-10o 1142  ax-16 1212  ax-11o 1220  ax-ext 1462  ax-sep 2708  ax-pow 2748  ax-pr 2785
This theorem depends on definitions:  df-bi 147  df-or 224  df-an 225  df-ex 983  df-sb 1174  df-eu 1384  df-mo 1385  df-clab 1467  df-cleq 1472  df-clel 1475  df-ne 1590  df-rex 1653  df-v 1815  df-dif 2052  df-un 2053  df-in 2054  df-ss 2056  df-nul 2284  df-pw 2406  df-sn 2416  df-pr 2417  df-op 2420  df-br 2625  df-opab 2672  df-id 2841  df-xp 3190  df-rel 3191  df-cnv 3192  df-dm 3194  df-rn 3195  df-res 3196  df-ima 3197
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