Origin for each line in src/example03.red from check-in c1ddb4c814:

c1ddb4c814 2021-03-01    1: % function analysis
c1ddb4c814 2021-03-01    2: 
c1ddb4c814 2021-03-01    3: f:=3*x^3-7*x^2;
c1ddb4c814 2021-03-01    4: fp:=df (f, x);
c1ddb4c814 2021-03-01    5: fpp:=df (fp, x);
c1ddb4c814 2021-03-01    6: 
c1ddb4c814 2021-03-01    7: % zeroes
c1ddb4c814 2021-03-01    8: solve (f, x);
c1ddb4c814 2021-03-01    9: % extremes
c1ddb4c814 2021-03-01   10: solve (fp, x);
c1ddb4c814 2021-03-01   11: % reversal points
c1ddb4c814 2021-03-01   12: solve (fpp, x);
c1ddb4c814 2021-03-01   13: 
c1ddb4c814 2021-03-01   14: % integration of 2nd derivative
c1ddb4c814 2021-03-01   15: f1:=int (fpp, x);
c1ddb4c814 2021-03-01   16: % integration of 1st derivative
c1ddb4c814 2021-03-01   17: f0:=int (f1, x);
c1ddb4c814 2021-03-01   18: f0:=int (fp, x);
c1ddb4c814 2021-03-01   19: 
c1ddb4c814 2021-03-01   20: end;