David G. L. Wang

collaborators

3 papers

math.CO2024

Positive $e_{I}$ -expansions for KPKP graphs, twinned lollipops, and kayak paddles

Davion Q. B. Tang, David G. L. Wang

We derive explicit positive $e_{I}$ -expansions for the chromatic symmetric functions of several graph families. First, we obtain a uniform formula for KPKP graphs that specializes to…

math.CO2024

Chromatic symmetric functions of conjoined graphs

E. Y. J. Qi, D. Q. B. Tang, D. G. L. Wang

We introduce path-conjoined graphs defined for two rooted graphs by joining their roots with a path, and investigate the chromatic symmetric functions of its two generalizations: s…

math.CO2024

The spiders $S (4 m + 2, 2 m, 1)$ are $e$ -positive

Davion Q. B. Tang, David G. L. Wang, Monica M. Y. Wang

By using the composition method, we establish the $e$ -positivity of spiders of the form $S (4 m + 2, 2 m, 1)$ , which was conjectured by Aliniaeifard, van Willigenburg and Wang. Foll…

Positive eI​-expansions for KPKP graphs, twinned lollipops, and kayak paddles

Chromatic symmetric functions of conjoined graphs

The spiders S(4m+2,2m,1) are e-positive

Positive $e_{I}$ -expansions for KPKP graphs, twinned lollipops, and kayak paddles

The spiders $S (4 m + 2, 2 m, 1)$ are $e$ -positive