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Graph
separation is a well-known tool to make (hard) graph problems accessible to a
divide and conquer approach. We show how to use graph separator theorems in combination
with (linear) problem kernels in order to develop fixed parameter algorithms for
many well-known NP-hard (planar) graph problems.
We coin the key notion of
glueable select verify graph problems and derive from that a prospective way to
easily check whether a planar graph problem will allow for a fixed parameter algorithm
of running time for constant c.
Besides, we introduce the novel concept of
``problem cores'' that might serve as an alternative to problem kernels for devising
parameterized algorithms. One of the main contributions of the paper is to exactly
compute the base c of the exponential term and its dependence on the various parameters
specified by the
employed separator theorem and the underlying graph problem.
We discuss several strategies to improve on the involved constant c.
Our findings
also give rise to studying further refinements of the complexity class FPT of
fixed parameter tractable problems.
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