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Theorem co02 5278
Description: Composition with the empty set. Theorem 20 of [Suppes] p. 63. (Contributed by NM, 24-Apr-2004.)
Assertion
Ref Expression
co02  |-  ( A  o.  (/) )  =  (/)

Proof of Theorem co02
Dummy variables  x  y  z are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 relco 5263 . 2  |-  Rel  ( A  o.  (/) )
2 rel0 4879 . 2  |-  Rel  (/)
3 noel 3514 . . . . . . 7  |-  -.  <. x ,  z >.  e.  (/)
4 df-br 4112 . . . . . . 7  |-  ( x
(/) z  <->  <. x ,  z >.  e.  (/) )
53, 4mtbir 678 . . . . . 6  |-  -.  x (/) z
65intnanr 938 . . . . 5  |-  -.  (
x (/) z  /\  z A y )
76nex 1549 . . . 4  |-  -.  E. z ( x (/) z  /\  z A y )
8 vex 2818 . . . . 5  |-  x  e. 
_V
9 vex 2818 . . . . 5  |-  y  e. 
_V
108, 9opelco 4929 . . . 4  |-  ( <.
x ,  y >.  e.  ( A  o.  (/) )  <->  E. z
( x (/) z  /\  z A y ) )
117, 10mtbir 678 . . 3  |-  -.  <. x ,  y >.  e.  ( A  o.  (/) )
12 noel 3514 . . 3  |-  -.  <. x ,  y >.  e.  (/)
1311, 122false 709 . 2  |-  ( <.
x ,  y >.  e.  ( A  o.  (/) )  <->  <. x ,  y >.  e.  (/) )
141, 2, 13eqrelriiv 4846 1  |-  ( A  o.  (/) )  =  (/)
Colors of variables: wff set class
Syntax hints:    /\ wa 104    = wceq 1398   E.wex 1541    e. wcel 2205   (/)c0 3510   <.cop 3694   class class class wbr 4111    o. ccom 4755
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-in1 619  ax-in2 620  ax-io 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-14 2208  ax-ext 2216  ax-sep 4230  ax-pow 4289  ax-pr 4324
This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-fal 1404  df-nf 1510  df-sb 1812  df-eu 2085  df-mo 2086  df-clab 2221  df-cleq 2227  df-clel 2230  df-nfc 2375  df-ral 2527  df-rex 2528  df-v 2817  df-dif 3215  df-un 3217  df-in 3219  df-ss 3226  df-nul 3511  df-pw 3673  df-sn 3697  df-pr 3698  df-op 3700  df-br 4112  df-opab 4174  df-xp 4757  df-rel 4758  df-co 4760
This theorem is referenced by:  co01  5279  gsumwmhm  13728  gfsumval  16879
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