Geodesic
$q$-deformed circularity for an unbounded operator in Hilbert space
Schôichi Ôta 1
1 Department of Content and Creative Design Kyushu University 4-9-1 Shiobaru, Fukuoka 815-8540, Japan
Colloquium Mathematicum, Tome 120 (2010) no. 2, pp. 191-199 Cet article a éte moissonné depuis la source Institute of Mathematics Polish Academy of Sciences

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The notion of strong circularity for an unbounded operator is introduced and studied. Moreover, $q$-deformed circularity as a $q$-analogue of circularity is characterized in terms of the partially isometric and the positive parts of the polar decomposition.
DOI : 10.4064/cm120-2-2
Keywords: notion strong circularity unbounded operator introduced studied moreover q deformed circularity q analogue circularity characterized terms partially isometric positive parts polar decomposition

Schôichi Ôta  1

1 Department of Content and Creative Design Kyushu University 4-9-1 Shiobaru, Fukuoka 815-8540, Japan 
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Schôichi Ôta. $q$-deformed circularity for an unbounded
 operator in Hilbert space. Colloquium Mathematicum, Tome 120 (2010) no. 2, pp. 191-199. doi: 10.4064/cm120-2-2

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