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 Mathematical Logic Philosophical Logic a bran h-8mat ematics the application of formal that gre w out of symbolic logic to 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