1) Properfunction 
Specifically, in the study of signals and systems, the eigenfunction of a system is the signal {math| f (t)} which when input into the system, produces a response {math|y(t) {{=} λ f (t)}} with the complex constant {mvar|λ}. ==Examples== ===Derivative operator=== The derivative operator is defined also for complex-val...
(from the article `Sturm-Liouville problem`) ...endpoints of the interval over which the variable ranges. If the functions , , and satisfy suitable conditions, the equation will have a family ...
Type: Term Pronunciation: ī′gĕn-fŭngk-chŏn Definitions: 1. A solution of a differentiated equation that has solutions only for particular values of some parameters.
a characteristic vector in a vector space in which the elements are functions. Also called