Question about a subset
3148
True or false: {{∅}} ⊂ {∅,{∅}}
17212
The preimage of a subset
147484
For a set with N members, what is the number of set partitions in which each subset is either of size 1 or 2?
56728
Question about limit points of a Subset of $\mathbb{R}$
11967
number of subsets of even and odd
108275
How do I count the subsets of a set whose number of elements is divisible by 3? 4?
42358
Find a Borel subset satisfying the condition
2900
How many $3$-subsets of $\{1,2,\ldots,10\}$ contain at least one even and one odd integer?
104855
Prove that $N \subset Z(G)$
88628
Proving the total number of subsets of S is equal to $2^n$
86902
Consider the smallest number in each of the $n\choose r$ subsets (of size $r$) of $S=\{1,2,\ldots,n\}$...
32754
Each number in a subset $S\subseteq \{1,\ldots,2n\}$ does not divide another one. Then $\max |S|$?
114968
Partition of a set, definition not clear
55023
if $A$ subset of $B$ then $P(B)-P(A)=P(B\setminus A)\ge 0$
146664
The union of two linearly independent subsets
122271
A subset of a transitive set is transitive
60309
Let X be a subset of {1,2,...,2014}...