General::nalg

更多信息

  • This message is generated when the indicated expression is expected to be an algebraic number.
  • The value of the Extension option in 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 Root expressions are algebraic numbers.
  • Off[message] switches off the message; On[message] switches it on. For example: Off[General::nalg].

范例

基本范例  (1)

All is a symbol rather than an algebraic number:

This shows a valid value for the Extension option in Factor: