Indeterminate

The term "indeterminate" is sometimes used as a synonym for unknown or variable (Becker and Weispfenning 1993, p. 188).

A mathematical expression can also be said to be indeterminate if it is not definitively or precisely determined. Certain forms of limits are said to be indeterminate when merely knowing the limiting behavior of individual parts of the expression is not sufficient to actually determine the overall limit. For example, a limit of the form 0/0, i.e., lim_(x->0)f(x)/g(x) where lim_(x->0)f(x)=lim_(x->0)g(x)=0, is indeterminate since the value of the overall limit actually depends on the limiting behavior of the combination of the two functions (e.g., lim_(x->0)x/x=1, while lim_(x->0)x^2/x=0).

There are seven indeterminate forms involving 0, 1, and infty:

 0/0,0·infty,infty/infty,infty-infty,0^0,infty^0,1^infty

(Thomas and Finney 1996, pp. 220 and 423; Gellert et al. 1989, p. 400). Note, however, that there is a certain ambiguity in this enumeration in the sense that symbolic expressions of the form infty/infty can perhaps be written as inftyinfty^(-1), etc.

If complex infinity infty^~ is allowed as well, then six additional indeterminate forms result:

 0·infty^~,(infty^~)/(infty^~),infty/(infty^~),(infty^~)/infty,infty^~-infty^~,1^(infty^~).

The Wolfram Language returns the symbol Indeterminate upon encountering such expressions in the course of an evaluation.

The Wolfram Functions Site uses the notation > to represent an indeterminate quantity.

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