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 dp_dtop(dpoly,vlist)

:: Converts a distributed polynomial into an ordinary polynomial.
 return

polynomial
 dpoly

distributed polynomial
 vlist

list

This function converts a distributed polynomial into an ordinary polynomial
according to a list of indeterminates vlist.

vlist is such a list that its length coincides with the number of
variables of dpoly.
[53] T=dp_ptod((x+y+z)^2,[x,y]);
(1)*<<2,0>>+(2)*<<1,1>>+(1)*<<0,2>>+(2*z)*<<1,0>>+(2*z)*<<0,1>>+(z^2)*<<0,0>>
[54] P=dp_dtop(T,[a,b]);
z^2+(2*a+2*b)*z+a^2+2*b*a+b^2
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