Hello! I currently have three open tickets with patches which add functionality related to cycle index series. I'd really appreciate reviews, comments, or other input!
* #14543: adds a compositional_inverse() method to CycleIndexSeries which, naturally, computes a plethystic inverse for a given cycle index series. I believe this one is all set to go, but it needs a review from someone who is comfortable with the inner workings of CycleIndexSeries and (possibly) LazyPowerSeries. * #14846: shuffles things around so that the derivative() and exponential() methods of CycleIndexSeries correspond to the combinatorial definitions of those operations (which are different than those inherited from LazyPowerSeries). The code works fine (as far as I can tell), but this is a design decision, and I'm a new kid, so I'd appreciate the input of more experienced folks on whether this is appropriate. * #14347: adds a GroupCycleIndexSeries class which implements Γ-cycle index series, which allow for working with species which carry a "structural" group action as in cf. [1]. I have some papers in draft that use this code, and I'd love to be able to cite a shipped version of Sage! --Andrew [1] http://www.combinatorics.org/ojs/index.php/eljc/article/view/v19i4p45
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