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Answers
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second order operator with real coefficients and not locally solvable
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Why is symplectic geometry so important in modern PDE ?
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Motivation for and history of pseudo-differential operators
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Counterexamples in PDE
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Combinatorial interpretation of the power of a series
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Excellent uses of induction and recursion
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Readings for an honors liberal art math course (3)
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Do you find your students are less competent in basic algebra and arithmetic, and, if so, do you believe that this is due to overuse of calculators at an early level?
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2 short article vs. a long one
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What is the Implicit Function Theorem good for?
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How to motivate and present epsilon-delta proofs to undergraduates?
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Functions of Pseudodifferential Operators