This web page was written on:
 
           30 August 2021
        The video was produced on:
 
           7 December 2017 
     
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EXTENDS Integers, Sequences
Remove(i, seq) == 
  [j \in 1..(Len(seq)-1) |-> IF j < i THEN seq[j] 
                                      ELSE seq[j+1]]
        
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\A v \in Data \X {0,1} : (AVar = v) ~> (BVar = v)