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#427 Solve wrong with irreducible polydecomp

open
nobody
5
2006-09-09
2003-10-20
No

poly: x^5+x-3$
polypoly: subst(d2,x,d2);
=> (x^5+x-3)^5+x^5+x-6

solve(polypoly,x)
=> [0 = -x^5+15*x^4-90*x^3+270*x^2-406*x+249]

This is incorrect. It is specifying the solutions of the
outer composed polynomial (polydecomp), not the
composition as a whole -- that said, I don't think there
is any notation in Maxima for specifying the composition
of implicit solutions.

Maxima 5.9.0 gcl 2.5.0

Discussion

  • Robert Dodier

    Robert Dodier - 2006-07-11

    Logged In: YES
    user_id=501686

    Same behavior in 5.9.3cvs.

     
  • Robert Dodier

    Robert Dodier - 2006-07-11
    • labels: --> 460522
     
  • Robert Dodier

    Robert Dodier - 2006-09-09
    • labels: 460522 --> 886274
     
  • Robert Dodier

    Robert Dodier - 2006-09-09
    • labels: 886274 --> Lisp Core - Solving equations
     

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