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Theorem euequ1 1992
Description: Equality has existential uniqueness. (Contributed by Stefan Allan, 4-Dec-2008.)
Assertion
Ref Expression
euequ1
Distinct variable group:   ,

Proof of Theorem euequ1
Dummy variable is distinct from all other variables.
StepHypRef Expression
1 a9e 1583 . 2
2 equtr2 1594 . . 3
32gen2 1336 . 2
4 equequ1 1595 . . 3
54eu4 1959 . 2
61, 3, 5mpbir2an 848 1
Colors of variables: wff set class
Syntax hints:   wi 4   wa 97  wal 1240  wex 1378  weu 1897
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 99  ax-ia2 100  ax-ia3 101  ax-io 629  ax-5 1333  ax-7 1334  ax-gen 1335  ax-ie1 1379  ax-ie2 1380  ax-8 1392  ax-10 1393  ax-11 1394  ax-i12 1395  ax-bnd 1396  ax-4 1397  ax-17 1416  ax-i9 1420  ax-ial 1424  ax-i5r 1425
This theorem depends on definitions:  df-bi 110  df-nf 1347  df-sb 1643  df-eu 1900  df-mo 1901
This theorem is referenced by:  copsexg  3972  oprabid  5480
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