An algebraic object is recognized as an indeterminate when it can be a (so-called) variable in polynomials. An ordinary indeterminate is usually denoted by a string that start with a small alphabetical letter followed by an arbitrary number of alphabetical letters, digits or `_'. In addition to such ordinary indeterminates, there are other kinds of indeterminates in a wider sense in Asir. Such indeterminates in the wider sense have type polynomial, and further are classified into sub-types of the type indeterminate.
 [vtype(a),vtype(aA_12)]; [0,0]
uc()creates an indeterminate which is denoted by a string that begins with `_'. Such an indeterminate cannot be directly input by its name. Other properties are the same as those of ordinary indeterminate. Therefore, it has a property that it cannot cause collision with the name of ordinary indeterminates input by the user. And this property is conveniently used to create undetermined coefficients dynamically by programs.
 U=uc(); _0  vtype(U); 1
cos(x+1)will remain as if they were not evaluated. These (unevaluated) forms are called `function forms' and are treated as if they are indeterminates in a wider sense. Also, special forms such as
@pithe ratio of circumference and diameter, and
@eNapier's number, will be treated as `function forms.'
 V=sin(x); sin(x)  vtype(V); 2  vars(V^2+V+1); [sin(x)]
 vtype(sin); 3
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