Polona Oblak

activity

20062026

most citedThe total zero-divisor graph of commutative rings

13 citations · 39 across the 25 of their papers we have counts for

collaborators

Showing 2020 · math.COShow all

2 papers · 2 filters

math.CO2020★ 1 cited

Orthogonal symmetric matrices and joins of graphs

Rupert H. Levene, Polona Oblak, Helena Šmigoc

We introduce a notion of compatibility for multiplicity matrices. This gives rise to a necessary condition for the join of two (possibly disconnected) graphs $G$ and $H$ to be the…

math.CO2020

On the inverse eigenvalue problem for block graphs

Jephian C. -H. Lin, Polona Oblak, Helena Šmigoc

The inverse eigenvalue problem of a graph $G$ aims to find all possible spectra for matrices whose $(i, j)$ -entry, for $i \neq = j$ , is nonzero precisely when $i$ is adjacent to $j$ . I…