1, the story of the chimney

Two people climbed out of the chimney, one with soot on his face and the other clean. Who do you think will take a shower? "The dirty one, of course." The student said, "No, the dirty one doesn't think he will be dirty when he sees the other person clean. He can't take a bath at all. "

2. Ill sentences in Chinese.

I once revised the question types of sick sentences in a Chinese exam, and I will never forget them until now. For example, "China has the Great Wall of Wan Li, which is unique in the world". Do you think this sentence is correct at first sight? But if we carefully scrutinize it with logic, we will find that "China has it" and "the world doesn't" are contradictory.

3, brain teaser misjudgment

We often ask "when two plus three is not five" in brain teasers, and we will quickly answer "when we do something wrong". Obviously, this answer is not difficult for most people. However, if you want to answer from a logical point of view, I am afraid that few people can answer it. In fact, the answer is "If 1 plus 1 is not equal to 2, then 2 plus 3 is not equal to 5", which is a sufficient condition for hypothetical judgment.

Logic theory and method have the following functions:

1, cognitive tools: help people correctly understand things, explore new achievements and acquire new knowledge.

2. Expression tools: help people express their thoughts accurately, rigorously and clearly, and establish new theories.

3. Persuasion tools: help people to make more rigorous and convincing reasoning and argumentation.

4. Analytical tools: help people expose fallacies and refute sophistry. It is helpful to think correctly, distinguish right from wrong and trace back to the source.

The application of logical thinking in life? Who can give an example?

The ability of logical thinking is generally reflected in many aspects of a person's daily life, such as speaking coherently, reasoning ability, and finding the connection between things.

And in life, people with strong logical thinking ability are not easy to be fooled and deceived by others ~

Examples of applying logic in life

1, when a person is suspicious, people come to a conclusion prematurely, and this conclusion is exactly what the real murderer wants, and even the murderer will disguise the scene to frame others. At this time, the judge will be observant, never let go of any relevant details, and only regard the suspect as the object of suspicion rather than directly convict, so as to find out the real murderer step by step.

2. A customer asked the shop assistant, "Is this coat really the most popular now?" The salesman said, "This is the most popular style now!" " "The customer said," Won't the sun fade? "The shop assistant said," Look at what you said, this dress has been hung in the window for three years, and it is still as good as new. "You can see that the answer is contradictory, and you can use logic to expose lies.

Extended data:

Introduction to logic:

Logic is a subject with the form of reasoning as the main research object, which has instrumental and methodological functions. It has a long history of two years or more, and has formed three logic traditions of the West, China and India. Modern logic has made great progress in this century. Logic is closely related to philosophical research and plays an important role in the development of philosophy, mathematics, computer science, artificial intelligence and language.

Logic is the study of thinking. All thinking has two aspects: content and form. Thinking content refers to the object and its attributes reflected by thinking. Thinking form refers to different ways of reflecting objects and their attributes, that is, different ways of expressing thinking content. From a logical point of view, the three basic forms of abstract thinking are concept, proposition and reasoning.