This is documentation for Mathematica 8, which was
based on an earlier version of the Wolfram Language.
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# Decompose

 Decomposedecomposes a polynomial, if possible, into a composition of simpler polynomials.
• Decompose gives a list of the polynomials which can be composed as to give the original polynomial.
• The set of polynomials is not necessarily unique.
• Decomposition is an operation which is independent of polynomial factorization.
Represent a polynomial as a composition of polynomials:
Represent a polynomial as a composition of polynomials:
 Out[1]=
 Scope   (3)
A composition of more than two polynomials:
No decomposition:
A polynomial with symbolic coefficients:
 Options   (1)
Decompose a polynomial over integers modulo 2:
 Applications   (1)
Solve some polynomial equations of degrees higher than 4 in terms of radicals:
Solve by solving and then etc:
Check that these indeed are the roots of :
Mathematica solvers use Decompose automatically:
Composition of polynomials given by Decompose gives the original polynomial:
Use Fold to compose the polynomials:
Use Expand to show that the result is equal to :
Use Factor to represent a polynomial as a product of irreducible factors:
can be factored but not decomposed; can be decomposed but not factored:
Decompose ignores possible decompositions with inner polynomials that are linear:
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