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match operator name to flajolet/sedgewick text "analytic combinatorics" I.2 II.2 |
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The power of this theorem lies in the fact that it makes it possible to construct operators on generating functions that represent combinatorial classes. A structural equation between combinatorial classes thus translates directly into an equation in the corresponding generating functions. Moreover in the labelled case it is evident from the formula that we may replace <math>g(z)</math> by the atom ''z'' and compute the resulting operator, which may then be applied to EGFs. We now proceed to construct the most important operators. The reader may wish to compare with the data on the [[cycle index]] page.
=== The sequence operator <math>\
This operator corresponds to the class
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