e/Stability radius

Information
has gloss	eng: The stability radius of a continuous function f (in a functional space F) with respect to an open stability domain D is the distance between f and the set of unstable functions (with respect to D). We say that a function is stable with respect to D if its spectrum is in D. Here, the notion of spectrum is defined on a case by case basis, as explained below.
lexicalization	eng: stability radius
instance of	(noun) a mathematical function that is the sum of a number of terms multinomial, polynomial