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				package concurrency.supwork;
				
				
				interface Function {
				  double fn(double x);
				}
				
				class OneMinusXsquared implements Function {
				  public double fn (double x) {return 1-x*x;}
				}
				
				class OneMinusXcubed implements Function {
				  public double fn (double x) {return 1-x*x*x;}
				}
				
				class XsquaredPlusPoint1 implements Function {
				  public double fn (double x) {return x*x+0.1;}
				}