private Expression NewtonBackwardDiffPart(int delta, Expression u, int times)
{
var c = FiniteFunctions.ChooseWithDiff(u, delta, times, 1);
var y = Table[delta + (1)][Rows - 1];
return(y * c);
}
private Expression NewtonForwardDiffPart(int delta, Expression u, int times)
{
var c = FiniteFunctions.ChooseWithDiff(u, delta, times, -1);
var y = Table[delta + (1)][0];
// (y.ToReal() + " * " + c.ToReal() + " = " + (y * c).ToReal()).Print();
return(y * c);
}