OpenersNotesSection(Spacer1)Details

This message is generated when the indicated expression is expected to be an algebraic number.

The value of the (RefLink[Extension, paclet:ref/Extension]) option in (RefLink[Factor, paclet:ref/Factor]) and related functions is expected to be an algebraic number or a list of algebraic numbers.

An algebraic number is a number that can occur as the root of a polynomial with integer coefficients. Integers, rational numbers, roots of integers, and (RefLink[Root, paclet:ref/Root]) expressions are algebraic numbers.

(RefLink[Off, paclet:ref/Off])[message] switches off the message; (RefLink[On, paclet:ref/On])[message] switches it on. For example: (RefLink[Off, paclet:ref/Off])[General::nalg].

OpenersPrimaryExamplesSection(Spacer1)Examples  (1)

OpenersExampleSection0(Spacer1)Basic Examples  (1)

(RefLink[All, paclet:ref/All]) is a symbol rather than an algebraic number:

Factor[2-x^2,Extension->All]

This shows a valid value for the (RefLink[Extension, paclet:ref/Extension]) option in (RefLink[Factor, paclet:ref/Factor]):

Factor[2-x^2,Extension->Sqrt[2]]

({{DocumentationFooterIconsRelatedFunction.png, ({{See Also}, {(RefLink[General, paclet:ref/General])}})}})