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7.7.4.10 lpVarAt

Procedure from library freegb.lib (see freegb_lib).

Usage:
lpVarAt(p, pos); p a poly, pos an int

Return:
poly

Assume:
basering is a Letterplace ring

Purpose:
returns the variable (as a poly) at position pos of the poly p

Example:
 
LIB "freegb.lib";
ring r = 0,(x,y),dp;
def R = makeLetterplaceRing(5);
setring R;
poly p = y*y*x;
lpVarAt(p, 3);
==> x

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