code: public static boolean eqv(boolean left, boolean right) {
  	return (left == true && right == true) || (left == false && right == false);
      }
docs: Equivalence: Return True if both operands are True or both are False. The EQV operator is the
  opposite of the XOR operator. For example, True EQV True is True, but True EQV False is False.
  
  @param left value to check
  @param right value to check
  @return result of operation