2 papers
math.CO2025
Clocks are -positive
L. Chen, Y. T. He, David G. L. Wang
Along with his confirmation of the -positivity of all cycle-chord graphs , the third author conjectured the -positivity of all theta graphs . In this pape…
math.CO2025
All cycle-chords are -positive
David G. L. Wang
We establish the -positivity of cycle-chord graphs by using the composition method which is developed by Zhou and the author recently. Our method is simpler than the -posit…