Geodesic
The numerical range of linear relations in spaces with an indefinite metric
Žurnal matematičeskoj fiziki, analiza, geometrii, Tome 7 (2000) no. 1, pp. 115-118 Cet article a éte moissonné depuis la source Math-Net.Ru

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It is shown that the numerical range of linear relations in spaces with an indefinite metric is always convex. 
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     author = {Ts. Bayasgalan},
     title = {The numerical range of linear relations in spaces with an indefinite metric},
     journal = {\v{Z}urnal matemati\v{c}eskoj fiziki, analiza, geometrii},
     pages = {115--118},
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Ts. Bayasgalan. The numerical range of linear relations in spaces with an indefinite metric. Žurnal matematičeskoj fiziki, analiza, geometrii, Tome 7 (2000) no. 1, pp. 115-118. http://geodesic.mathdoc.fr/item/JMAG_2000_7_1_a5/