دانلود کتاب Logic

From the Author: "This book was written for people who want to learn some elementary logic, regardless of whether they are taking a course in it. The book is written as a conversation between you (the reader) and me (the author). To keep the conversation from being too one-sided, I put in fairly frequent exercises. You are strongly urged to try to answer these as you reach them. Correct answers are given at the end of the book.If you have a phobia of symbols, you should leave out the seven sections marked ' ' in the text. These cover the branch of logic known as Formal Logic; they contain the worst of the mathematics. English words and phrases which are being discussed are usually printed bold; most of these are listed in the index. A word is printed in quotes ' ' when we are chiefly interested in the way it occurs in some phrase. "