The derivative is an artifact, the first of the great concepts of modern science that fails conspicuously to… — David Berlinski

In the twelfth century, for example, Bhāskara demonstrated correctly that + = an achievement, I might add, utterly beyond the collective intellectual power, say, of the English department at Duke University. (It is pleasant to imagine members of the department sitting together in a long lecture hall, Marxists to one side, deconstructionists to the other, abusing one another roundly as they grapple with the problem.)

I have written this book in isolation, hardly talking to a soul, but unoppressed as well by campus codes or creeds, free to say what I want and when I want. It is a measure of the degradation that has overtaken American academic life that I should feel obliged to boast of such circumstances.

Stepping forward, I step back, the two steps, one forward and one back, canceling one another so that after they have been completed, I am where I started, having done something but accomplished little, a useful metaphor for a great many activities in life.