Philosophical Logic

This book is Wittgenstein's major work and an important early work of logical positivism. It was revered as a classic in the early analytical philosophy movement.
 
From the author's statement that "the world is everything that is the case" to "whereof one cannot speak, thereof one must be silent," he successfully defines a limit to the world. The concepts mentioned in the book, such as "atomic facts," "states of affairs," and "objects," as well as their precise meanings and relationships, have been the subject of careful study by researchers of the book for more than half a century.
 
In this book, Wittgenstein denies the law of causality, asserts that propositions of logic and mathematics are tautological, argues that all debated issues in the history of philosophy are meaningless, and defines the task of philosophy as merely the logical analysis of language, i.e., the clarification of everyday language.