Definition:Extremal
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Definition
Extremal of Function
Let $f$ be a real function.
An extremal of $f$ is a value in the domain of $f$ at which $f$ attains an extremum.
Extremal of Functional
An extremal is a function which minimizes or maximizes a functional (usually a definite integral).
Also see
- Results about extremals can be found here.
Sources
- 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) ... (previous) ... (next): extremal