In both texts a girl and a boy fall in love ( a " formula " with a symbolic operator between them would be " Boy "'+ "'
2.
A theorem in the Flajolet & ndash; Sedgewick theory of symbolic combinatorics treats the enumeration problem of labelled and unlabelled combinatorial classes by means of the creation of symbolic operators that make it possible to translate equations involving combinatorial structures directly ( and automatically ) into equations in the generating functions of these structures.
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