Abstract
The symbol “∪” is used both for the set-theoretical union and for the more general notion of Boolean join. In most cases, if both interpretations of “∪” are possible, they coincide. In the opposite case, either it is explicitly stated, or it is evident from the text how the symbol “∪” should actually be interpreted. The same remarks hold for the symbol “∩” used both for the set-theoretical intersection and for the more general notion of Boolean meet. They hold also for the symbols “ ∪ ” and “ ∩ ” of the corresponding infinite operations (see also notation on p. 50–51 for infinite Boolean joins and meets) and for the symbol “—” of complementation and the symbol “ ⊂ ” of inclusion.
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© 1960 Springer-Verlag Berlin Heidelberg
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Sikorski, R. (1960). Terminology and notation. In: Boolean Algebras. Ergebnisse der Mathematik und Ihrer Grenzgebiete, vol 25. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-01492-9_1
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DOI: https://doi.org/10.1007/978-3-662-01492-9_1
Publisher Name: Springer, Berlin, Heidelberg
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