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arXiv · 2606.15829

On singular values and trace norm of signed digraphs

Mushtaq A. Bhat·Peer Abdul Manan
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Abstract

Let $S = (D, σ)$ be a signed digraph, where $D=(\mathcal{V},\mathcal{A})$ is the underlying digraph of $S$ and $σ:\mathcal{A}\rightarrow\{-1,+1\}$ is a sign function. In this paper, we study the adjacency singular values of signed digraphs. We provide a necessary and sufficient condition for the singular values of a digraph to remain invariant under signing. We study rank of signed digraphs and determine signed digraphs with rank one. As an application of this result, we obtain a lower bound for the trace norm of signed digraphs and characterize the extremal signed digraphs.

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Mushtaq A. Bhat, Peer Abdul Manan. 2026-09-11. On singular values and trace norm of signed digraphs. https://arxiv.org/abs/2606.15829

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