Schwarz, Štefan Unions of powers of binary relations. (Russian) Zbl 0286.20075 Mat. Čas., Slovensk. Akad. Vied 24, 161-171 (1974). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 1 Document MSC: 20M10 General structure theory for semigroups 05C20 Directed graphs (digraphs), tournaments 08A05 Structure theory of algebraic structures 03E20 Other classical set theory (including functions, relations, and set algebra) PDFBibTeX XMLCite \textit{Š. Schwarz}, Mat. Čas., Slovensk. Akad. Vied 24, 161--171 (1974; Zbl 0286.20075) Full Text: EuDML