Number of subsets of A that contain B where B is a subset of A
136306
Let $A$ be a finite set and let $B$ be a subset of $A$ with $|A|=n$,$|B|=m$ and $0<m<n$. Count the subsets of $A$ containing $ B.$
156006
Cardinality of set containing all infinite subsets of $\mathbb{Q}$
49143
Showing $A \subset B \iff A\cap B=A$
11817
Proving that every set $A \subset \Bbb N$ of size $n$ contains a subset $B \subset A$ with $n | \sum_{b \in B} b$
119084
How many ordered pairs $(A,B)$ they are if $A$ and $B$ are subsets of $\{ 1,2,3,4,5 \}$ such that $A \cap B = \{1\}$?
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?
76405
Let n be an even integer. How many different ways can I choose subsets of the set {1,2...,n}
134770
For sets $A,B$, $A \cap (B \setminus A) \subseteq \varnothing$
113668
Uncountable chain of subsets of $\mathbb N$
45111
Number of Subspaces that contains other Space
124325
Element of, subset of and empty sets
108807
Subset of a cartesian product
64519
Subsets of a list
43068
Let A and B be sets. Show that A is a subset of B if and only if for any set C, one has A union C is a subset of B union C.
146098
Number of nonempty subsets of a set with $n$ elements
70278
$A\subseteq B\to C\setminus B\subseteq C\setminus A\,$ -- how to prove this?
20335
If $A\subset B$ then $\bar{A}\subset \bar{B}$