DECOMPOSE Operator
Date: 2020-10-07 18:10:00

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### 9.9 DECOMPOSE Operator

The DECOMPOSE operator takes a multivariate polynomial as argument, and returns an expression and a list of equations from which the original polynomial can be found by composition. Its syntax is:

DECOMPOSE(EXPRN:polynomial):list.

For example:

decompose(x^8-88*x^7+2924*x^6-43912*x^5+263431*x^4-
218900*x^3+65690*x^2-7700*x+234)
2 2 2
-> {U + 35*U + 234, U=V + 10*V, V=X - 22*X}
2
decompose(u^2+v^2+2u*v+1) -> {W + 1, W=U + V}

Users should note however that, unlike factorization, this decomposition is not unique.

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