Geodesic
Centers of mass for operator-families
Glasgow mathematical journal, Tome 34 (1992) no. 1, pp. 123-126

Voir la notice de l'article provenant de la source Cambridge University Press

Let Hbe a complex Hilbert space and let B(H) be the algebra of (bounded) operators on H. Let A =(A,...,An) be an n-tuple of operators on H. The joint numerical range of A is the subset W(A) of Cn such that 
Takaguchi, Makoto. Centers of mass for operator-families. Glasgow mathematical journal, Tome 34 (1992) no. 1, pp. 123-126. doi: 10.1017/S0017089500008612
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