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Introductory Differential Equations using Sage - William Stein

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v<br />

There are some things which cannot<br />

be learned quickly, and time, which is all we have,<br />

must be paid heavily for their acquiring.<br />

They are the very simplest things,<br />

and because it takes a man’s life to know them<br />

the little new that each man gets from life<br />

is very costly and the only heritage he has to leave.<br />

Ernest Hemingway<br />

(From A. E. Hotchner, Papa Hemingway, Random House, NY, 1966)

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