| #### D.2.12.21 hasAlgExtensionCoefficient Procedure from library `ring.lib` (see ring_lib). Usage: hasAlgExtensionCoefficient ( rng ); Return: 1 if the coefficients are an algebraic extension, 0 otherwise. Example:
    LIB "ring.lib";
    ring rng = integer,x,dp;
    hasAlgExtensionCoefficient(rng); //no
    ==> 0
    ring rng2 = (0,a), x, dp; minpoly=a2-1;
    hasAlgExtensionCoefficient(rng2);  // yes
    ==> 1
    ring rng3=(49,a),x,dp;
    hasAlgExtensionCoefficient(rng3);  // no
    ==> 0

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