Miscellany
Sequences and Series
Calculus and Differential Equations
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Slope Fields (webMathematica): input the functional form of a
derivative and see the slope field
Fractals
Linear Algebra
Social Choice
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Voting and Power Indices (webMathematica): input the quota
and a set of player weights to see the Banzhaf and Shapley-Shubik power
indices
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Apportionment Methods (webMathematica): input the
legislature size and a set of state populations to see the apportionments of
Hamilton, Jefferson, Adams, Webster, and Huntington-Hill.
Statistics