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Lecture notes on differential equations, by Bob Terrell.
My translation of the 1934 paper of Leray on the Navier Stokes equations.
If you are looking for very good texts on single and multivariable calculus, I recommend these books by Peter Lax and Maria Terrell, available from Springer.
The Poincare Lemma and the Fundamental Theorem of Calculus
Good Questions in Linear Algebra
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