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Quick question about Interval[]

  • To: mathgroup at smc.vnet.net
  • Subject: [mg34181] Quick question about Interval[]
  • From: Roland Pabel <pabel at tabu.uni-bonn.de>
  • Date: Wed, 8 May 2002 01:57:51 -0400 (EDT)
  • Organization: RHRZ - University of Bonn (Germany)
  • Reply-to: roland at pabel.net
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,
I've got a quick question about Intervals : Everything works fine when I use 
IntervallIntersection and IntervalUnion. I curiously used the symbols 
\[Union] and \[Intersection], but only \[Union] works as expected :

Notebook[{
Cell[BoxData[{
    \(\(i = Interval[{3, 7}];\)\), "\[IndentingNewLine]",
    \(\(j = Interval[{\(-2\), 5}];\)\)}], "Input"],

Cell[CellGroupData[{

Cell[BoxData[
    \(i \[Union] j\)], "Input"],

Cell[BoxData[
    \(Interval[{\(-2\), 7}]\)], "Output"]
}, Open  ]],

Cell[CellGroupData[{

Cell[BoxData[
    \(i \[Intersection] j\)], "Input"],

Cell[BoxData[
    \(Interval[]\)], "Output"]
}, Open  ]]
},
FrontEndVersion->"4.0 for X",
]

As you can see, the Intersection using \[Intersection] is empty. Is this a 
bug or is \[Union] a (unnoted?) feature?
thanks,
Roland
-- 
ICQ UIN 49339118                        Linux Counter #88774
GPG-Key 1024D/C969F3F2 2001-02-28 Roland Pabel <roland at pabel.net>
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