We introduce a new method, involving infinite games and Borel determinacy, which we use to answer several well-known questions in Borel combinatorics.

This article models legal interpretation through argumentation and provides a logical analysis of interpretive arguments, their conflicts, the resulting indeterminacies. Interpretive arguments are modelled as defeasible inferences, which can be challenged defeated by counterarguments reinstated further arguments. It is shown what claims possibly (defensibly) or necessarily (justifiably) support...