Solipsism
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Solipsism is the philosophical position that only one's own mind is certain to exist. It holds that knowledge of anything outside one's own mind, including the external world and other minds, is uncer
1727 portrait of George Berkeley by John Smibert
Christine Ladd-Franklin
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Christine Ladd-Franklin was an American psychologist, logician, and mathematician.
Solipsism
…Bertrand Russell wrote that it was "psychologically impossible" to believe in solipsism. "I once received a letter from an eminent logician, Mrs. Christine Ladd-Franklin, saying that she was a solipsist, and was surprised that there were no others. Coming from a logician and a solipsist, her surprise surprised me". He…
Christine Ladd-Franklin