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Text File  |  2003-02-09  |  250 b   |  17 lines

  1. gensumindex:0$
  2. y:sum(a[i]*x^i,i,0,inf);
  3. y1:diff(y,x);
  4. y2:diff(y1,x);
  5. (x^2+1)*y2+3*x*y1+2*y;
  6. expand(%);
  7. factor(%);
  8. intosum(%)$
  9. bashindices(%);
  10. changevar(%,(j4-2)-j,j,j4);
  11. niceindices(%);
  12. sumcontract(%);
  13. factor(%);
  14. part(%,1);
  15. %/x^i=0;
  16. solve(%,a[i+2]);
  17.