Theory of Probability revisited

This document provides an overview of chapters from Sir Harold Jeffreys' classic book "Theory of Probability". It summarizes Jeffreys' background and contributions, including developing one of the first comprehensive Bayesian frameworks. It also reviews Jeffreys' construction of noninformative prior distributions, which aim to represent a state of ignorance through being invariant to reparameterization of the model. However, the document notes some difficulties with Jeffreys' approach, such as improper priors potentially leading to inconsistent results for hypothesis testing of point nulls.