Is this powerset right?

  • #1

Homework Statement



if A ={a}, B={b,c}, C={d,e,f,g,h,i,j}

Find P(A*B)
and |P(B*C)|



Homework Equations





The Attempt at a Solution



so for the first one I had

[{(a,b)}, {(a,c)}, {(a,b),(a,c)}, ∅]

and secondly 2^14.

is this right I dont know what is meant by the use of this |..| around a power set?
 

Answers and Replies

  • #2
LCKurtz
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What does A*B mean?
 
  • #3
What does A*B mean?

Sorry its meant to mean A times B

dont know what the proper sign is ? or do I just use ()
 
  • #4
LCKurtz
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Sorry its meant to mean A times B

dont know what the proper sign is ? or do I just use ()

Sets have union and intersection operations. What is the definition of A "times" B?
 
  • #5
Sets have union and intersection operations. What is the definition of A "times" B?

Its a Cartesian product
 
  • #6
LCKurtz
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Ok, now that I understand your notation your answers look fine. The absolute value signs around a set just means how many elements it contains. So your ##2^{14}## is correct.
 

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