Take the 2-minute tour ×
Mathematics Stack Exchange is a question and answer site for people studying math at any level and professionals in related fields. It's 100% free, no registration required.

If you have a set that looks like S1 = {0,1,2,3,4} I understand the cardinality of the set is 5.

What about if you have a set of sets so

S1 = {S2, S3, S4}
S2 = {1, 2, 3} 
S3 = {1, 2}
S4 = {1}

For the cardinality of S1 do you count all the elements of the included sets so the answer would be 6 or do you just count the number in the S1 so it would be 3

share|improve this question
add comment

1 Answer 1

up vote 3 down vote accepted

It is the latter, i.e. we just count the number of elements of $S1$, which is 3.

share|improve this answer
add comment

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.