"Somewhere a bicycle bell rings. Somewhere else there's a war on. Somewhere else people turn to shadows and powder in an instant and the streets turn to funnels and light the sky with their burning. Somewhere a war is over."

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Mathematics is the most exact science, and its conclusions are capable of absolute proof. But this is so only because mathematics does not attempt to draw absolute conclusions. All mathematical truths are relative, conditional. In E. T. Bell Men of Mathematics, New York: Simona and Schuster, 1937.

— Charles Proteus Steinmetz