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Theorem relssdr 2668
Description: A relation is included in the cross product of its domain and range. Exercise 4.12(t) of [Mendelson] p. 235.
Assertion
Ref Expression
relssdr |- (Rel A -> A (_ (dom A X. ran A))

Proof of Theorem relssdr
StepHypRef Expression
1 id 9 . 2 |- (Rel A -> Rel A)
2 19.8a 712 . . . . 5 |- (<.x, y>. e. A -> E.y<.x, y>. e. A)
3 19.8a 712 . . . . 5 |- (<.x, y>. e. A -> E.x<.x, y>. e. A)
42, 3jca 236 . . . 4 |- (<.x, y>. e. A -> (E.y<.x, y>. e. A /\ E.x<.x, y>. e. A))
5 visset 1350 . . . . . 6 |- y e. V
65opelxp 2452 . . . . 5 |- (<.x, y>. e. (dom A X. ran A) <-> (x e. dom A /\ y e. ran A))
7 visset 1350 . . . . . . 7 |- x e. V
87eldm2 2528 . . . . . 6 |- (x e. dom A <-> E.y<.x, y>. e. A)
95elrn 2562 . . . . . 6 |- (y e. ran A <-> E.x<.x, y>. e. A)
108, 9anbi12i 369 . . . . 5 |- ((x e. dom A /\ y e. ran A) <-> (E.y<.x, y>. e. A /\ E.x<.x, y>. e. A))
116, 10bitr 151 . . . 4 |- (<.x, y>. e. (dom A X. ran A) <-> (E.y<.x, y>. e. A /\ E.x<.x, y>. e. A))
124, 11sylibr 175 . . 3 |- (<.x, y>. e. A -> <.x, y>. e. (dom A X. ran A))
1312a1i 7 . 2 |- (Rel A -> (<.x, y>. e. A -> <.x, y>. e. (dom A X. ran A)))
141, 13relssdv 2482 1 |- (Rel A -> A (_ (dom A X. ran A))
Colors of variables: wff set class
Syntax hints:   -> wi 2   /\ wa 196  E.wex 678   e. wcel 1092   (_ wss 1487  <.cop 1810   X. cxp 2408  dom cdm 2410  ran crn 2411  Rel wrel 2415
This theorem is referenced by:  cnvexg 2669  coexg 2671  resfunexg 2717  fnex 2740  fssxp 2761
This theorem was proved from axioms:  ax-1 3  ax-2 4  ax-3 5  ax-mp 6  ax-4 673  ax-5 674  ax-6 675  ax-7 676  ax-gen 677  ax-8 798  ax-9 799  ax-10 800  ax-11 801  ax-12 802  ax-13 804  ax-14 805  ax-16 922  ax-17 925  ax-ext 1074  ax-rep 1075  ax-pow 1077
This theorem depends on definitions:  df-bi 128  df-or 197  df-an 198  df-ex 679  df-sb 853  df-clab 1093  df-cleq 1097  df-clel 1099  df-v 1349  df-dif 1489  df-un 1490  df-in 1491  df-ss 1492  df-nul 1708  df-pw 1799  df-sn 1811  df-pr 1812  df-op 1815  df-br 2063  df-opab 2098  df-xp 2424  df-rel 2425  df-cnv 2426  df-dm 2428  df-rn 2429
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