|  |  D.14.4.15 bvar Procedure from librarypolybori.lib(see  polybori_lib).
 
Example:Usage:
bvar(i); int i
Return:
i-th variable of Boolean ring corresponding to current basering
 See also:
 boolean_poly_ring;
 var.|  | LIB "polybori.lib";
ring r = 2,(x,y,z),Dp;
bvar(1); // -> x
==> x
==> 
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