Geodesic
Checking positive definiteness or stability of symmetric interval matrices is NP-hard
Commentationes Mathematicae Universitatis Carolinae, Tome 35 (1994) no. 4, pp. 795-797 Cet article a éte moissonné depuis la source Czech Digital Mathematics Library

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It is proved that checking positive definiteness, stability or nonsingularity of all [symmetric] matrices contained in a symmetric interval matrix is NP-hard.
It is proved that checking positive definiteness, stability or nonsingularity of all [symmetric] matrices contained in a symmetric interval matrix is NP-hard.
Classification : 15A18, 15A48, 65F30, 65G30, 65Y20, 68Q25
Keywords: positive definiteness; stability; nonsingularity; NP-hardness 
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     author = {Rohn, Ji\v{r}{\'\i}},
     title = {Checking positive definiteness or stability of symmetric interval matrices is {NP-hard}},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
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Rohn, Jiří. Checking positive definiteness or stability of symmetric interval matrices is NP-hard. Commentationes Mathematicae Universitatis Carolinae, Tome 35 (1994) no. 4, pp. 795-797. http://geodesic.mathdoc.fr/item/CMUC_1994_35_4_a20/