Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.
Currently there are both a tag for logic and logical-fallacy. Which one should be used? Is it necessary that both should be used?
Those are not equivalent, logical-fallacy is a specific subset of logic. They are not synonyms.
Logic. Logical fallacies are faulty logic. Logic will show that they are.