Computational problem in the SCI hierarchy
= Computational problem in the SCI hierarchy
A computational problem is a quadruple $(\Xi,\Omega,\mathcal M,\Lambda)$: the primary set $\Omega$ contains the inputs, $\Lambda$ is the family of permitted evaluation functions, $(\mathcal M,d)$ is the output metric space, and $\Xi:\Omega\to\mathcal M$ is the problem function.