“Infinity, in its first form (the improper-infinite) presents itself as a variable finite [veranderliches Endliches]; in the other form (which I call the proper infinite [Eigentlich-unendliche]) it appears as a thoroughly determinate [bestimmtes] infinite.”

—  Georg Cantor

From Kant to Hilbert (1996)

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Georg Cantor 27
mathematician, inventor of set theory 1845–1918

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