Macen T.

asked • 10/19/14

U={x | x is a whole number, x = 10} and P= {x | x is prime}. Express P in roster notation

U={x | x is a whole number, x ≤ 10} and P= {x | x is prime}. Express P in roster notation

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Russ P. answered • 10/19/14

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Russ P.

To correct a typo and add a comment.
 
+-2 should have been listed as primes since 2 is only divisible by 1 or itself.  Some people leave out +-1 as a prime because it's sort of a degenerate case: being only divisible by 1 and itself 1.  Some people also leave out all the negative signed primes because it's symmetrical about x=0.  If so to all these conventions, then the list of primes becomes {2, 3, 5, 7, 11, 13, 17 ... to infinity}.  And the U says that x <= 10.
 
Then P becomes the finite roster set {2, 3, 5, 7}.  So it all depends on which conventions you abide by in your classroom.
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10/19/14

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