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Write ⊆ or ⊄

KOO

New member
Oct 19, 2013
19
Question 1) Write ⊆ or ⊄:

{x/(x+1) : x∈N} ________ Q


NOTE:
⊆ means SUBSET
⊄ means NOT A SUBSET
∈ means ELEMENT
N means Natural Numbers
Q means Rational Numbers

Question 2)
Which of the following sets are infinite and uncountable?
R - Q
{n∈N: gcd(n,15) = 3}
(-2,2)
N*N
{1,2,9,16,...} i.e the set of perfect squares
 
Last edited:

topsquark

Well-known member
MHB Math Helper
Aug 30, 2012
1,140
Question 1) Write ⊆ or ⊄:

{x/(x+1) : x∈N} ________ Q


NOTE:
⊆ means SUBSET
⊄ means NOT A SUBSET
∈ means ELEMENT
N means Natural Numbers
Q means Rational Numbers

Question 2)
Which of the following sets are infinite and uncountable?
R - Q
{n∈N: gcd(n,15) = 3}
(-2,2)
N*N
{1,2,9,16,...} i.e the set of perfect squares
1) Is x/(x + 1), when x is a natural number, a rational number?

2) Is R countable? Is Q countable?

-Dan