These interlinking essays are connected by a core theme: the necessary structures in reality that allow certain knowledge of absolute truths. Franklin's Aristotelian realist philosophy of mathematics shows how mathematical truths are directly about physical reality, and at the same time certainly and provably true. Ranging from mathematics to evidence evaluation to ethics, his philosophy of probability sees the recreation of evidence to hypothesis, such as in science and law, as purely logical, hence necessary. Here is an up-to-date introduction to Franklin's overall perspective.