Ludwig Wittgenstein (1889-1951) is considered by most philosophers - even those who do not share his views - to be the most influential philosopher of the 20th century. His contributions to the philosophy of language, mind, meaning and psychology - as well as to logic, mathematics and epistemology - permanently altered the philosophical landscape, and his Tractatus Logico Philosophicus and Philosophical Investigations continue to be studied in philosophy departments around in the world. In this superb introduction and overview of Wittgenstein's life and work, William Child discusses:...