Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Inverse Spectral Problems for Linked Vibrating Systems and Structured
  Matrix Polynomials   We show that for a given set $\Lambda$ of $nk$ distinct real numbers
$\lambda_1, \lambda_2, \ldots, \lambda_{nk}$ and $k$ graphs on $n$ nodes, $G_0,
G_1,\ldots,G_{k-1}$, there are real symmetric $n\times n$ matrices $A_s$,
$s=0,1,\ldots, k$, such that the matrix polynomial $A(z) := A_k z^k + \cdots +
A_1 z + A_0$ has $\Lambda$ as its spectrum, the graph of $A_s$ is $G_s$ for
$s=0,1,\ldots,k-1$, and $A_k$ is an arbitrary positive definite diagonal
matrix. When $k=2$, this solves a physically significant inverse eigenvalue
problem for linked vibrating systems (see Corollary 5.3).

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The categories of this paper are: mtrl-th
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The categories of this paper are: gr-qc
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The categories of this paper are: q-alg
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The categories of this paper are: stat
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The categories of this paper are: plasm-ph
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The categories of this paper are: eess
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The categories of this paper are: atom-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: astro-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: chao-dyn
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The categories of this paper are: quant-ph
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The categories of this paper are: hep-th
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The categories of this paper are: alg-geom
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The categories of this paper are: bayes-an
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The categories of this paper are: nucl-th