“Purely mathematical symbols have no meaning by themselves; it is the privilege of pure mathematicians, to quote Bertrand Russell, not to know what they are talking about. …It is the physicist, and not the mathematician, who must know what he is talking about.”

—  Willem de Sitter

Kosmos (1932)

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Willem de Sitter photo
Willem de Sitter44
Dutch cosmologist 1872–1934

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