4 problems

Let $\mathcal P_m(n)$ be the generalised pancake graph and let $Q(\mathfrak P_{m,n})$ be the associated matrix used in the paper. For a symmetric matrix or graph, write $\lambda_1$…

Let $\mathcal P_m(n)$ denote the generalised pancake graph, and let $\lambda_1(\mathcal P_m(n))$ and $\lambda_2(\mathcal P_m(n))$ be its largest and second-largest signless Laplaci…

Girth conjecture for $BS_6$. For every $n\geqslant 19$,

Pancake graph equitable coloring conjecture. For every $n\geqslant 2$,