$a_i$-invariants of powers of ideals

Inspired by the recent work of Lu and O'Rourke, we study the $a_i$-invariants of (symbolic) powers of some graded ideals. The first scenario is when $I$ and $J$ are two graded ideals in two distinct polynomial rings $R$ and $S$ over a common field $\mathbb{K}$. We study the $a_i$-invariants of the powers of the fiber product via the corresponding knowledge of $I$ and $J$. The second scenario is when $I_Δ$ is the Stanley-Reisner ideal of a $k$-dimensional simplicial complex $Δ$ with $k\ge 2$. We investigate the $a_i$-invariants of the symbolic powers of $I_Δ$.

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