“What is the Vienna Circle?” is a question which is neither rhetorical nor trivial. It is perhaps an attempt to ‘square the circle’ – which is, meanwhile, mathematically possible, as Karl Menger described as early as 1934.
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Notes from Wikiquote
Of course, we are all familiar with the irritating fact that one and the same phenomenon can be described consistently by more than one theory (underdetermination of a theory by observation). | p. xi