|  |  D.2.11.18 hasCommutativeVars Procedure from libraryring.lib(see  ring_lib).
 
Example:Usage:
hasCommutativeVars ( rng );
Return:
1 if rng is a commutative polynomial ring, 0 otherwise.
 |  | LIB "ring.lib";
ring r=0,(x,y,z),dp;
hasCommutativeVars(r);
==> 1
 | 
 
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