Analysis:

Logic usually refers to the law that people think about problems from some known conditions and draw reasonable conclusions.

To say that someone is logical means that he is good at reasoning and can draw correct conclusions. To say that someone is illogical means that his reasoning is incorrect and he has reached a wrong conclusion.

Logic is sometimes called logic. Logic is a theory that studies the law of reasoning. Logic is divided into classical logic and modern logic.

There are different types of logic, such as deductive logic, inductive logic, formal logic and informal logic.

Known conditions and conclusions in logical reasoning are propositions that can judge whether they are true or false. If we take proposition as the most basic component and only study the law of propositional reasoning, we can get propositional logic. Further, if the proposition is subdivided into predicates, quantifiers will get predicate logic.

Represent propositions, predicates and quantifiers with symbols, and get symbolic logic. Symbolic logic is often used in mathematics to study reasoning, so it is also called mathematical logic.

In the 20th century, mathematical logic developed rapidly, and its four main branches: * * theory, model theory, recursion theory and proof theory have become important disciplines of mathematics. Modern logic, such as modal logic, sequential logic, probabilistic logic, quantum logic, fuzzy logic and other application logics emerge one after another.

In this way, the meaning of logic is too rich. Logic has become the foundation of mathematics, philosophy, computer science and even every subject.