"After four tortured years, more than 400 over life-sized figures, I felt as old and as weary as Jeremiah. I was only 37, yet friends did not recognize the old man I had become."

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One main reason why the separate nature of the science of operations has been little felt, and in general little dwelt on, is the shifting meaning of many of the symbols used in mathematical notation. First, the symbols of operation are frequently also the symbols of the results of operations.

— Ada Lovelace