The quadratic functional is the second variation of and is denoted by,
2.
Where is a linear functional ( the first variation ), is a quadratic functional, and as.
3.
Here you have a quadratic functional on an affine hyperspace, which is unbounded both above and below.
4.
As a result, the Hamiltonian is a quadratic functional of the surface potential " ? ".
5.
Where the Poisson problem corresponds to minimization of a quadratic functional over a linear subspace of functions, the free boundary problem corresponds to minimization over a convex set.
6.
If db / dt is not constant then we are into Bo's territory of non-elementary functions that satisfy a quadratic functional equation . talk ) 09 : 13, 20 November 2011 ( UTC)