Notes on Practical Reasoning

I need at the start to say something about the relevance of logic, probability, and decision theory to reasoning by oneself—inference and deliberation—and to reasoning with others. The matter is complicated because the terms “logic”, “theory of probability”, and “decision theory” are used sometimes to refer to formal mathematical theories of implication and consistency, sometimes to refer to theories of method or methodologies, and sometimes to refer to a mixture of theories of these two sorts.