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 21.2.8 Comparison Predicates
 ----------------------------
 
  -- Scheme Procedure: =
      Return `#t' if all parameters are numerically equal.
 
  -- Scheme Procedure: <
      Return `#t' if the list of parameters is monotonically increasing.
 
  -- Scheme Procedure: >
      Return `#t' if the list of parameters is monotonically decreasing.
 
  -- Scheme Procedure: <=
      Return `#t' if the list of parameters is monotonically
      non-decreasing.
 
  -- Scheme Procedure: >=
      Return `#t' if the list of parameters is monotonically
      non-increasing.
 
  -- Scheme Procedure: zero?
      Return `#t' if Z is an exact or inexact number equal to zero.
 
  -- Scheme Procedure: positive?
      Return `#t' if X is an exact or inexact number greater than zero.
 
  -- Scheme Procedure: negative?
      Return `#t' if X is an exact or inexact number less than zero.
 

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