#### 93.1.10 operators of arguments must all be the same

One possible reason for this error message to appear is a try to use `append` in order to add an equation to a list:

    (%i1) l:[a=1,b=2,c=3];
    (%o1)                 [a = 1, b = 2, c = 3]

    (%i2) append(l,d=5);
    append: operators of arguments must all be the same.
     -- an error. To debug this try: debugmode(true);

In order to add an equation to a list it has to be wrapped in a single-element list first:

    (%i1) l:[a=1,b=2,c=3];
    (%o1)                 [a = 1, b = 2, c = 3]

    (%i2) append(l,[d=5]);
    (%o2)             [a = 1, b = 2, c = 3, d = 5]

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Categories: Error messages