What is Logic? 。Logic The discipline that deals with the methods of reasoning The study of the principles and criteria of valid inference and demonstration Ma hematical lo IC Philosophical logic a brana cs that the application of formal logic to grew ut of symboli logic philosophical problemsWhat is Logic？ • Logic • The discipline that deals with the methods of reasoning • The study of the principles and criteria of valid inference and demonstration Mathematical logic a branch of mathematics that grew out of symbolic logic Philosophical logic the application of formal logic to philosophical problems