Undefined
Undefined
is a symbol that represents a quantity with no defined value.
Details
- Computations like ConditionalExpression[expr,False] generate Undefined.
- If Undefined appears in an argument of a mathematical function, equation, inequality, or Boolean operator the result will be Undefined.
Examples
Basic Examples (2)
ConditionalExpression with False condition evaluates to Undefined:
ConditionalExpression[a, False]The number of solutions depends on the value of x:
Solve[y ^ 3 - x y == 2, y, Reals]For x=1 only the first solution is defined:
% /. x -> 1Mathematical expressions containing Undefined evaluate to Undefined:
a == Sin[y] + 1 || a == 2 /. %
Wolfram Research (2010), Undefined, Wolfram Language function, https://reference.wolfram.com/language/ref/Undefined.html.
Text
Wolfram Research (2010), Undefined, Wolfram Language function, https://reference.wolfram.com/language/ref/Undefined.html.
CMS
Wolfram Language. 2010. "Undefined." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/Undefined.html.
APA
Wolfram Language. (2010). Undefined. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/Undefined.html