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Normalized comments and headers to that they will format their POD documentation properly. (I know that the POD processing was supposed to strip off the initial #, but that doesn't seem to happen, so I've added a space throughout.)

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Changed Parser.pl to MathObjects.pl

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Updated calls to Parser::Context->getCopy to remove unneeded undef argument.

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Use new context methods.

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Fixing docementation so that it can be read from the web.

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Extended this context to handle multivariable polynomials. So you can use things like loadMacros("contextLimitedPolynomial.pl"); Context("LimitedPolynomial")->variables->are(x => 'Real', y => 'Real'); Context()->flags->set(singlePowers=>1); $f = Formula("1 + x + y + 2xy + x^2 + y^2");

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Fixed a problem where things like x+4x would be accepted even in single-power mode (the initial x was not being identified as a single power of x correctly).

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Fixed typo.

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Make error messages potentially localizable (by making them use sprintf-style strings rather than variable subtitution).

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Implements a Parser context in which only polynomials (of a single variable) can be entered. Only sums of multiples of powers of the variable are allowed to be entered (though the coefficients can contain mathematical operations). An optional flag lets you specify that only one term of each degree is allowed, so the student would have to combine 1+x+x+x^2 to get 1+2x+x^2 in that case.

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