киса

public interface Сoefficients {
	// u'' + p*u' + q*u = f
	// u(a) = getA; u(b) = getB()      a < x < b
	
	public double f(double x);
	public double q(double x);
	public double p(double x);
	
	public double getA();
	public double getB();
}