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//page 199
//Example 6.7
clc;
clear;
close;
disp('F is a field with D as differentiation operator on the space F[x].');
disp('n is an integer as n>0.');
disp('W is space of polynomialswith degree <= n.');
disp('so, W is invariant undet D.');
disp('And, D is degree decreasing.');
//end