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In page Philosophical Investigations:
"In its preface, Wittgenstein says that Philosophical Investigations can be understood "only by contrast with and against the background of my old way of thinking". That "old way of thinking" is to be found in the only book Wittgenstein published in his lifetime, the Tractatus Logico-Philosophicus. Many of the ideas developed in the Tractatus are criticised in the Investigations, while other ideas are further developed.[citation needed]
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