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47A13 Several-variable operator theory (spectral, Fredholm, etc.) (4 articles)

• Wawrzyńczyk, Antoni: Subsets of nonempty joint spectrum in topological algebras. (English). Mathematica Bohemica, vol. 143 (2018), issue 4, pp. 441-448
• Müller, Vladimír: A note on joint capacities in Banach algebras. (English). Czechoslovak Mathematical Journal, vol. 43 (1993), issue 2, pp. 367-372
• Müller, Vladimír; Sołtysiak, Andrzej: On local joint capacities of operators. (English). Czechoslovak Mathematical Journal, vol. 43 (1993), issue 4, pp. 743-751
• Sołtysiak, Andrzej: On a certain class of subspectra. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 32 (1991), issue 4, pp. 715-721