I have to admit that I made a serious mistake in what I wrote in my first book.
- Wittgenstein philosophical inquiry p.11 Introduction
The “first book” is Essays in Philosophy of Logic and Philosophy, written in 1918 and published in 1921. It is believed that Philosophical Inquiry was roughly finished writing by 1946. Publication was posthumous.
As an example of how a book author’s ideas are not immutable, I wrote in column (Column) Time Direction Reading of The Intellectual Production of Engineers p.125, but thought it would be better to be more specific.
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