Users' Mathboxes Mathbox for Scott Fenton < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  MPE Home  >  Th. List  >   Mathboxes  >  altxpeq1 Unicode version

Theorem altxpeq1 24507
Description: Equality for alternate cross products. (Contributed by Scott Fenton, 24-Mar-2012.)
Assertion
Ref Expression
altxpeq1  |-  ( A  =  B  ->  ( A  XX.  C )  =  ( B  XX.  C
) )

Proof of Theorem altxpeq1
Dummy variables  x  y  z are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 rexeq 2737 . . 3  |-  ( A  =  B  ->  ( E. x  e.  A  E. y  e.  C  z  =  << x ,  y >> 
<->  E. x  e.  B  E. y  e.  C  z  =  << x ,  y >> ) )
21abbidv 2397 . 2  |-  ( A  =  B  ->  { z  |  E. x  e.  A  E. y  e.  C  z  =  << x ,  y >> }  =  { z  |  E. x  e.  B  E. y  e.  C  z  =  << x ,  y
>> } )
3 df-altxp 24493 . 2  |-  ( A 
XX.  C )  =  { z  |  E. x  e.  A  E. y  e.  C  z  =  << x ,  y
>> }
4 df-altxp 24493 . 2  |-  ( B 
XX.  C )  =  { z  |  E. x  e.  B  E. y  e.  C  z  =  << x ,  y
>> }
52, 3, 43eqtr4g 2340 1  |-  ( A  =  B  ->  ( A  XX.  C )  =  ( B  XX.  C
) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    = wceq 1623   {cab 2269   E.wrex 2544   <<caltop 24490    XX. caltxp 24491
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1533  ax-5 1544  ax-17 1603  ax-9 1635  ax-8 1643  ax-6 1703  ax-7 1708  ax-11 1715  ax-12 1866  ax-ext 2264
This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-tru 1310  df-ex 1529  df-nf 1532  df-sb 1630  df-clab 2270  df-cleq 2276  df-clel 2279  df-nfc 2408  df-rex 2549  df-altxp 24493
  Copyright terms: Public domain W3C validator