Distinguishing between presidential and parliamentary systems, between centralized and federalist states, or between different health care [ 56] and welfare systems [ 57] might be helpful in explaining differing definitions of PI as a policy problem.
Besides comparative research on the general and context-specific definitions of PI as a policy problem, an important next step would be to investigate which solutions, or policy instruments, might be best suited to solve the problem.
For instance, it may be worth investigating whether liberal welfare state models in North America lead to definitions of PI as a policy problem that are more focused on individual behaviour than in the corporatist and social democratic welfare regimes of Central and Northern Europe [ 57].
Thus (H^phi in {{mathrm{sm}}}_pi (G^phi )) by the definition of a (pi )-submaximal subgroup.
From the definition of NEO-PI-R [ 7], subjects with higher Openness to Experience are much more willing to consider novel ideas and to try out unusual approaches to problem solving; people with higher Conscientiousness are scrupulous, well organized and disciplined; Extraversion drives people to search for the general experience of positive emotion.
Let us extend the definition of the maps (pi ) and (tau ) to maps (pi :Qtimes X^*longrightarrow Q) and (tau :Qtimes X^*longrightarrow X) by the inductive rules begin{aligned} pi (q, xv =pi (pi (q, x), v),qquad tau (q, xv =tau (pi (q, x), v)).
2.4 for the definition of the representations (pi _n).
Since there is nothing more evident than light, there is nothing less in need of definition" (PI, 76), thereby establishing the centrality of the concept of light for his Illuminationist ontology and epistemology.
