Geodesic
On the analogue of the formula cos \(t = \frac{1}{2} e^{it} + \frac{1}{2} e^{-it}\) for operator cosine functions
Commentationes Mathematicae, Tome 23 (1983) no. 1, pp. 173-182.

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DOI : 10.14708/cm.v23i1.6051
Mots-clés : 
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     title = {On the analogue of the formula cos \(t = \frac{1}{2} e^{it} + \frac{1}{2} e^{-it}\) for operator cosine functions},
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S. Tymowski. On the analogue of the formula cos \(t = \frac{1}{2} e^{it} + \frac{1}{2} e^{-it}\) for operator cosine functions. Commentationes Mathematicae, Tome 23 (1983) no. 1, pp.  173-182. doi : 10.14708/cm.v23i1.6051. http://geodesic.mathdoc.fr/articles/10.14708/cm.v23i1.6051/

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