Relations Let I be a set of sports teams: T= {Red Sox, Patriots, Spurs, Blackhawks, Giants, Celtics } We say that team x is "affiliated" with y if they won championships in the same year this century (note that some teams may have won more than one championship this century, but never more than one in a year). Let us define the relation "affiliated" (XAy) as a subset of the cartesian product Tx L That is: XAy = { (Red Sox, Red Sox), (Spurs, Spurs), (Giants, Giants), (Giants, Celtics), (Blackhawks, Red Sox) (Celtics, Giants), (Patriots, Spurs) (Red Sox, Patriots), (Patriots, Patriots), (Blackhawks, Blackhawks), (Celtics, Celtics), (Blackhawks, Patriots), (Spurs, Patriots) (Patriots, Red Sox) (Patriots, Blackhawks) (Red Sox, Blackhawks)} 1. Note that it may help to draw a diagram to answer the following questions! 2. Is the "affiliated" relation symmetric? Why or why not? Answer: 3. Is the "affiliated" relation transitive? Why or why not? Answer: 4. Is the "affiliated" relation reflexive? Why or why not? Answer: 5. Is the "affiliated" relation an equivalence relation? Why or why not? Answer:

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Relations
Let I be a set of sports teams:
T= {Red Sox, Patriots, Spurs, Blackhawks, Giants, Celtics }
We say that team x is "affiliated" with y if they won championships in the same year this century (note
that some teams may have won more than one championship this century, but never more than one in
a year). Let us define the relation "affiliated" (XAY) as a subset of the cartesian product TxL That is:
XAy = {
(Red Sox, Red Sox),
(Spurs, Spurs),
(Giants, Giants),
(Giants, Celtics),
(Blackhawks, Red Sox)
(Celtics, Giants),
(Patriots, Spurs)
(Red Sox, Patriots),
(Patriots, Patriots),
(Blackhawks, Blackhawks),
(Celtics, Celtics),
(Blackhawks, Patriots),
(Spurs, Patriots)
(Patriots, Red Sox)
(Patriots, Blackhawks)
(Red Sox, Blackhawks)}
1. Note that it may help to draw a diagram to answer the following questions!
2. Is the "affiliated" relation symmetric? Why or why not? Answer:
3. Is the "affiliated" relation transitive? Why or why not? Answer:
4. Is the "affiliated" relation reflexive? Why or why not? Answer:
5. Is the "affiliated" relation an equivalence relation? Why or why not? Answer:
Transcribed Image Text:Relations Let I be a set of sports teams: T= {Red Sox, Patriots, Spurs, Blackhawks, Giants, Celtics } We say that team x is "affiliated" with y if they won championships in the same year this century (note that some teams may have won more than one championship this century, but never more than one in a year). Let us define the relation "affiliated" (XAY) as a subset of the cartesian product TxL That is: XAy = { (Red Sox, Red Sox), (Spurs, Spurs), (Giants, Giants), (Giants, Celtics), (Blackhawks, Red Sox) (Celtics, Giants), (Patriots, Spurs) (Red Sox, Patriots), (Patriots, Patriots), (Blackhawks, Blackhawks), (Celtics, Celtics), (Blackhawks, Patriots), (Spurs, Patriots) (Patriots, Red Sox) (Patriots, Blackhawks) (Red Sox, Blackhawks)} 1. Note that it may help to draw a diagram to answer the following questions! 2. Is the "affiliated" relation symmetric? Why or why not? Answer: 3. Is the "affiliated" relation transitive? Why or why not? Answer: 4. Is the "affiliated" relation reflexive? Why or why not? Answer: 5. Is the "affiliated" relation an equivalence relation? Why or why not? Answer:
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