Using OR Operator; Display Sets (DS) Command
•?S MATH OR MATHEMATICS
•           10825  MATH
•           54890  MATHEMATICS
•      S5   58984  MATH OR MATHEMATICS
•?DS
•Set     Items   Description
•S1      54890   MATHEMATICS
•S2       4055   FEAR
•S3        116   S1 AND S2
•S4     169200   1 AND 2
•S5      58984   MATH OR MATHEMATICS
•?
Set S4 is a mistake – I searched for occurrences of the numbers ‘1’ and ‘2’
In this slide, I’ve used the OR Operator.  It helped me to retrieve more than 4,000 additional records that should cover the concept of mathematics.

Followed by that, I may be losing track of the sets that I’ve created.  “DS” is the abbreviation for “DISPLAY SETS.”  I use this command a lot.

Note set “S4.”  It shows a mistake.  The “S” before the number for sets is VERY important.  Set “S3” is quite different from set “S4!”  The results of set S4 are a Boolean AND of records containing the “word” “1” and the “word” “2” – the computer will treat a number as if it were a word unless given specific instructions not to do so.  We’ll see some of those examples later in the class.