Noncommutative Polynomials Describing Convex Sets
Noncommutative Polynomials Describing Convex Sets
复制标题
描述凸集的非交换多项式
DOI:
10.1007/s10208-020-09465-w
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发表时间:
2021
影响因子:
3
通讯作者:
Volčič, Jurij
中科院分区:
文献类型:
--
作者:
Helton, J. William;Klep, Igor;McCullough, Scott;Volčič, Jurij
The free closed semialgebraic setdetermined by a hermitian noncommutative polynomialis the closure of the connected component ofcontaining the origin. WhenLis a hermitian monic linear pencil, the free closed semialgebraic setis the feasible set of the linear matrix inequalityand is known as a free spectrahedron. Evidently these are convex and it is well known that a free closed semialgebraic set is convex if and only it is a free spectrahedron. The main result of this paper solves the basic problem of determining thoseffor whichis convex. The solution leads to an efficient algorithm that not only determines ifis convex, but if so, produces a minimal hermitian monic pencilLsuch that. Of independent interest is a subalgorithm based on a Nichtsingulärstellensatz presented here: given a linear penciland a hermitian monic pencilL, it determines iftakes invertible values on the interior of. Finally, it is shown that ifis convex for an irreducible hermitian, thenfhas degree at most two, and arises as the Schur complement of anLsuch that.
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DOI:
10.1137/14097865x
发表时间:
2013
期刊:
SIAM J. Optim.
影响因子:
--
作者:
M. Laurent;Teresa Piovesan
通讯作者:
Teresa Piovesan
影响因子:
1.4
作者:
W. Eberly
通讯作者:
W. Eberly
DOI:
10.1007/978-3-319-31383-2_7
发表时间:
2015
期刊:
arXiv: Complex Variables
影响因子:
--
作者:
A. Grinshpan;Dmitry S. Kaliuzhnyi;V. Vinnikov;H. Woerdeman
通讯作者:
H. Woerdeman
影响因子:
0.9
作者:
I. Klep;Jurij Volčič
通讯作者:
Jurij Volčič
DOI:
10.1016/j.jfa.2011.08.006
发表时间:
2010
期刊:
arXiv: Operator Algebras
影响因子:
--
作者:
J. M. Greene;J. Helton;V. Vinnikov
通讯作者:
V. Vinnikov