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Theorem co02 5299
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 5284 . 2  |-  Rel  ( A  o.  (/) )
2 rel0 4900 . 2  |-  Rel  (/)
3 noel 3525 . . . . . . 7  |-  -.  <. x ,  z >.  e.  (/)
4 df-br 4129 . . . . . . 7  |-  ( x
(/) z  <->  <. x ,  z >.  e.  (/) )
53, 4mtbir 682 . . . . . 6  |-  -.  x (/) z
65intnanr 942 . . . . 5  |-  -.  (
x (/) z  /\  z A y )
76nex 1553 . . . 4  |-  -.  E. z ( x (/) z  /\  z A y )
8 vex 2824 . . . . 5  |-  x  e. 
_V
9 vex 2824 . . . . 5  |-  y  e. 
_V
108, 9opelco 4950 . . . 4  |-  ( <.
x ,  y >.  e.  ( A  o.  (/) )  <->  E. z
( x (/) z  /\  z A y ) )
117, 10mtbir 682 . . 3  |-  -.  <. x ,  y >.  e.  ( A  o.  (/) )
12 noel 3525 . . 3  |-  -.  <. x ,  y >.  e.  (/)
1311, 122false 713 . 2  |-  ( <.
x ,  y >.  e.  ( A  o.  (/) )  <->  <. x ,  y >.  e.  (/) )
141, 2, 13eqrelriiv 4867 1  |-  ( A  o.  (/) )  =  (/)
Colors of variables: wff set class
Syntax hints:    /\ wa 104    = wceq 1402   E.wex 1545    e. wcel 2209   (/)c0 3520   <.cop 3711   class class class wbr 4128    o. ccom 4776
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 623  ax-in2 624  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-sep 4247  ax-pow 4309  ax-pr 4344
This theorem depends on definitions:  df-bi 117  df-3an 1011  df-tru 1405  df-fal 1408  df-nf 1514  df-sb 1816  df-eu 2089  df-mo 2090  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ral 2533  df-rex 2534  df-v 2823  df-dif 3222  df-un 3224  df-in 3226  df-ss 3233  df-nul 3521  df-pw 3690  df-sn 3714  df-pr 3715  df-op 3717  df-br 4129  df-opab 4191  df-xp 4778  df-rel 4779  df-co 4781
This theorem is referenced by:  co01  5300  gzsumwmhm  13783  gsumvalfi  14132
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