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8.9.14 dp_ptozp, dp_prim

dp_ptozp(dpoly)
:: 定数倍して係数を整数係数かつ係数の整数 GCD を 1 にする.
dp_prim(dpoly)
:: 有理式倍して係数を整数係数多項式係数かつ係数の多項式 GCD を 1 にする.

return
分散表現多項式
dpoly
分散表現多項式

 
[208] X=dp_ptod(3*(x-y)*(y-z)*(z-x),[x]);
(-3*y+3*z)*<<2>>+(3*y^2-3*z^2)*<<1>>+(-3*z*y^2+3*z^2*y)*<<0>>
[209] dp_ptozp(X);                       
(-y+z)*<<2>>+(y^2-z^2)*<<1>>+(-z*y^2+z^2*y)*<<0>>
[210] dp_prim(X);                        
(1)*<<2>>+(-y-z)*<<1>>+(z*y)*<<0>>

参照
6.3.18 ptozp.



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