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Reality of the external world
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René Descartes John Smibert: George Berkeley William Orpen: G.E. Moore Ludwig Wittgenstein Headshot of Martin Heidegger wearing a dark suit and light tie, looking slightly to the side with a neutral expression.
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Reality of the external world: Media

philosophy
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René Descartes
Portrait of the French philosopher and mathematician René Descartes, oil on oak by...
Statens Museum for Kunst (National Gallery of Denmark); www.smk.dk (Public domain)
John Smibert: George Berkeley
Anglo-Irish philosopher George Berkeley, oil painting by John Smibert, c. 1732; in...
Courtesy of The National Portrait Gallery, London
William Orpen: G.E. Moore
British philosopher G.E. Moore, a cofounder of analytic philosophy, pencil drawing...
Courtesy of the National Portrait Gallery, London
Ludwig Wittgenstein
Austrian-born British philosopher Ludwig Wittgenstein, detail of a fellowship admission...
Pictorial Press Ltd/Alamy
Martin Heidegger
German philosopher of hermeneutics and existentialism Martin Heidegger.
© Bettmann/Getty Images
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