Hellwig, K.-E. Relative entropy of states in a two \(q\)-bit system. (English) Zbl 1071.81507 Doebner, H.-D. (ed.) et al., Quantum theory and symmetries. Proceedings of the international symposium held in Goslar, Germany, July 18–22, 1999. Singapore: World Scientific (ISBN 981-02-4237-9). 412-417 (2000). MSC: 81P15 82B10 94A17 PDF BibTeX XML Cite \textit{K. E. Hellwig}, in: Quantum theory and symmetries. Proceedings of the international symposium held in Goslar, Germany, July 18--22, 1999. Singapore: World Scientific. 412--417 (2000; Zbl 1071.81507)
Chumakov, S. M.; Hellwig, K.-E.; Klimov, A. B. Developing entropy of open finite-level systems. (English) Zbl 1116.82302 Int. J. Theor. Phys. 38, No. 12, 3221-3229 (1999). MSC: 82B10 47N50 81V80 PDF BibTeX XML Cite \textit{S. M. Chumakov} et al., Int. J. Theor. Phys. 38, No. 12, 3221--3229 (1999; Zbl 1116.82302) Full Text: DOI
Bugajski, S.; Hellwig, K.-E.; Stulpe, W. On fuzzy random variables and statistical maps. (English) Zbl 1026.60501 Rep. Math. Phys. 41, No. 1, 1-11 (1998). MSC: 60E99 46N30 46N50 81S25 28E10 82B03 PDF BibTeX XML Cite \textit{S. Bugajski} et al., Rep. Math. Phys. 41, No. 1, 1--11 (1998; Zbl 1026.60501) Full Text: DOI
Chumakov, S. M.; Hellwig, K.-E.; Klimov, A. B. The entropy of open finite-level systems. (English) Zbl 0907.15020 Int. J. Theor. Phys. 37, No. 1, 471-479 (1998). Reviewer: M.Shapiro (México) MSC: 15A90 28D20 81P99 PDF BibTeX XML Cite \textit{S. M. Chumakov} et al., Int. J. Theor. Phys. 37, No. 1, 471--479 (1998; Zbl 0907.15020) Full Text: DOI
Hellwig, Karl-Eberhard (ed.); Keyl, Michael (ed.); Stulpe, Werner (ed.); Trucks, Mathias (ed.) Special issue: Proceedings of the International Quantum Structures Association 1996. Berlin, Germany, July 29 - August 3, 1996. (English) Zbl 0905.00080 Int. J. Theor. Phys. 37, No. 1, 628 p. (1998). MSC: 00B25 81-06 PDF BibTeX XML Cite \textit{K.-E. Hellwig} (ed.) et al., Int. J. Theor. Phys. 37, No. 1, 628~p. (1998; Zbl 0905.00080)
Chumakov, S. M.; Hellwig, K.-E.; Rivera, A. L. Quantum Zeno effect in unitary quantum mechanics. (English) Zbl 1020.81528 Phys. Lett., A 197, No. 2, 73-82 (1995). MSC: 81P15 PDF BibTeX XML Cite \textit{S. M. Chumakov} et al., Phys. Lett., A 197, No. 2, 73--82 (1995; Zbl 1020.81528) Full Text: DOI
Hellwig, K.-E. General scheme of measurement processes. (English) Zbl 0850.81015 Int. J. Theor. Phys. 34, No. 8, 1467-1479 (1995). MSC: 81P15 PDF BibTeX XML Cite \textit{K. E. Hellwig}, Int. J. Theor. Phys. 34, No. 8, 1467--1479 (1995; Zbl 0850.81015) Full Text: DOI
Hellwig, Karl-Eberhard; Wegner, Bernd Mathematics and theoretical physics II. A combined basic course for physicists and mathematicians. (Mathematik und Theoretische Physik II. Ein integrierter Grundkurs für Physiker und Mathematiker.) (German) Zbl 0795.00001 de Gruyter Lehrbuch. Berlin: de Gruyter. xii, 390 p. DM 58.00; öS 765.00; sFr 58.00 /sc (1993). Reviewer: W.Muschik (Berlin) MSC: 00A05 00-01 00A06 30-01 34-01 35-01 46-01 81-01 PDF BibTeX XML Cite \textit{K.-E. Hellwig} and \textit{B. Wegner}, Mathematik und Theoretische Physik II. Ein integrierter Grundkurs für Physiker und Mathematiker. Berlin: de Gruyter (1993; Zbl 0795.00001)
Busch, P.; Hellwig, K.-E.; Stulpe, W. On classical representations of finite-dimensional quantum mechanics. (English) Zbl 0813.60004 Int. J. Theor. Phys. 32, No. 3, 399-405 (1993). MSC: 60A99 81P10 PDF BibTeX XML Cite \textit{P. Busch} et al., Int. J. Theor. Phys. 32, No. 3, 399--405 (1993; Zbl 0813.60004) Full Text: DOI
Hellwig, K.-E. Quantum measurements and information theory. (English) Zbl 0866.46048 Gielerak, R. (ed.) et al., Quantum groups and related topics. Proceedings of the first Max Born symposium, Wojnowice Castle, Wrocław, Poland, September 27-29, 1991. Dordrecht: Kluwer Academic Publishers. Math. Phys. Stud. 13, 211-221 (1992). Reviewer: W.Slowikowski (Aarhus) MSC: 46N50 81P15 PDF BibTeX XML Cite \textit{K. E. Hellwig}, Math. Phys. Stud. 13, 211--221 (1992; Zbl 0866.46048)
Hellwig, K.-E. Conditional expectations and duals of instruments. (English) Zbl 0537.60033 Interpretations and foundations of quantum theory, Proc. Conf., Marburg 1979, 113-124 (1981). Reviewer: H.Cycon MSC: 60G20 46L51 46L53 46L54 81P20 60J99 PDF BibTeX XML
Hellwig, K.-E.; Krausser, D. Erratum to ”Propositional systems and measurements. II”. (English) Zbl 0404.03058 Int. J. Theor. Phys. 17, 81 (1978). MSC: 03G12 81P10 06C15 PDF BibTeX XML Cite \textit{K. E. Hellwig} and \textit{D. Krausser}, Int. J. Theor. Phys. 17, 81 (1978; Zbl 0404.03058) Full Text: DOI
Hellwig, K.-E.; Krausser, D. Propositional systems and measurements. III: Quasitensorproducts of certain orthomodular lattices. (English) Zbl 0404.03059 Int. J. Theor. Phys. 16, 775-793 (1977). MSC: 03G12 81P10 06C15 PDF BibTeX XML Cite \textit{K. E. Hellwig} and \textit{D. Krausser}, Int. J. Theor. Phys. 16, 775--793 (1977; Zbl 0404.03059) Full Text: DOI
Hellwig, K.-E.; Krausser, D. Propositional systems and measurements. II. (English) Zbl 0404.03057 Int. J. Theor. Phys. 10, 261-272 (1974). MSC: 03G12 81P10 06C15 PDF BibTeX XML Cite \textit{K. E. Hellwig} and \textit{D. Krausser}, Int. J. Theor. Phys. 10, 261--272 (1974; Zbl 0404.03057) Full Text: DOI
Hellwig, K.-E.; Krausser, D. Propositional systems and measurements. I. (English) Zbl 0404.03056 Int. J. Theor. Phys. 9, 277-289 (1974). MSC: 03G12 81P10 06C15 PDF BibTeX XML Cite \textit{K. E. Hellwig} and \textit{D. Krausser}, Int. J. Theor. Phys. 9, 277--289 (1974; Zbl 0404.03056) Full Text: DOI
Hellwig, K.-E.; Kraus, K. Pure operations and measurements. (English) Zbl 0165.58302 Commun. Math. Phys. 11, 214-220 (1969). MSC: 81-XX PDF BibTeX XML Cite \textit{K. E. Hellwig} and \textit{K. Kraus}, Commun. Math. Phys. 11, 214--220 (1969; Zbl 0165.58302) Full Text: DOI