| #### D.14.1.1 arrSet Procedure from library `arr.lib` (see arr_lib). Usage: arrSet(A, k, p); arr A, int k, poly p; Return: [arr] Arrangement where the k-th hyperplane is replaced by p. Note: p must be linear Example:
    LIB "arr.lib";
    ring R = 0,(x,y,z),dp;
    arr A = ideal(x,y,z);
    arrSet(A,1,x+1);
    ==> _[1]=x+1
    ==> _[2]=y
    ==> _[3]=z
    ==>

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