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- W4288365886 abstract "In 1995 Stanley introduced a generalization of the chromatic polynomial of a graph $G$, called the chromatic symmetric function, $X_G$, which was generalized to noncommuting variables, $Y_G$, by Gebhard-Sagan in 2001. Recently there has been a renaissance in the study of $X_G$, in particular in classifying when $X_G$ is a positive linear combination of elementary symmetric or Schur functions. We extend this study from $X_G$ to $Y_G$, including establishing the multiplicativity of $Y_G$, and showing $Y_G$ satisfies the $k$-deletion property. Moreover, we completely classify when $Y_G$ is a positive linear combination of elementary symmetric functions in noncommuting variables, and similarly for Schur functions in noncommuting variables, in the sense of Bergeron-Hohlweg-Rosas-Zabrocki. We further establish the natural multiplicative generalization of the fundamental theorem of symmetric functions, now in noncommuting variables, and obtain numerous new bases for this algebra whose generators are chromatic symmetric functions in noncommuting variables. Finally, we show that of all known symmetric functions in noncommuting variables, only all elementary and specified Schur ones can be realized as $Y_G$ for some $G$." @default.
- W4288365886 created "2022-07-29" @default.
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- W4288365886 date "2019-04-19" @default.
- W4288365886 modified "2023-10-14" @default.
- W4288365886 title "Chromatic symmetric functions in noncommuting variables revisited" @default.
- W4288365886 doi "https://doi.org/10.48550/arxiv.1904.09298" @default.
- W4288365886 hasPublicationYear "2019" @default.
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