"Eric S. Raymond" <esr@thyrsus.com> Subject: Re: [Python-Dev] Re: PEP 218 (sets): > Is it + for disjunction and juxtaposition for conjunction, or the other > way around? + is 'or' and juxtaposition (or sometimes a dot) is 'and' (I prefer those words because they're shorter than 'disjunction' and 'conjunction', and I can remember which is which:-). These are probably where Wirth got the idea of using + and * from in Pascal -- 'or' is considered the 'addition' operator in boolean algebra, and 'and' the 'multiplication' operator. (Although the two are actually completely symmetrical in their algebraic properties, so it's an arbitrary choice.) Greg Ewing, Computer Science Dept, +--------------------------------------+ University of Canterbury, | A citizen of NewZealandCorp, a | Christchurch, New Zealand | wholly-owned subsidiary of USA Inc. | greg@cosc.canterbury.ac.nz +--------------------------------------+
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