= Spectral parameter for a linear boundary value problem
{title2=$\lambda$}
= Spectral parameters for a linear boundary value problem
{synonym}
= Boundary spectral parameter
{synonym}
A complex parameter labels auxiliary solutions of a linear <differential equation>, such as exponential adjoint solutions used in a <global relation for a linear boundary value problem>. It need not be a discrete <eigenvalue> or a parameter of a nonlinear <Lax pair>. Analytic dependence on it allows transformed boundary identities to be sampled or inverted.
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