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### `cr_gcda`

`cr_gcda(poly1,poly2)`
  :: 代数体上の 1 変数多項式の GCD

return
  多項式
poly1 poly2
  多項式

- ``sp'` で定義されている.
- 2 つの 1 変数多項式の GCD を求める.

    [76] X=x^6+3*x^5+6*x^4+x^3-3*x^2+12*x+16$
    [77] Y=x^6+6*x^5+24*x^4+8*x^3-48*x^2+384*x+1024$
    [78] A=newalg(X);
    (#0)
    [79] cr_gcda(X,subst(Y,x,x+A));
    x+(-#0)

`参照`
  section `gr`, `hgr`, `gr_mod`, `dgr`, section `asq`, `af`, `af_noalg`

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