Intersection of the empty set does not exist.
84609
Unary intersection of the empty set
128844
An empty intersection of decreasing sequence of closed sets
16004
Intersect (analysis) of polygons generating empty output
75012
Additive group of rationals has no minimal generating set
89712
For every set $A$, the empty set is a subset of $A$. The empty set is a set. Therefore, the empty set has a cardinality $\geq 1\ldots$
26919
Intersection of Connected Sets
102250
Subset of $C[0,1]$ is nowhere dense
17703
$S$ be a collection of subsets of $\{1,...,100\}$ ; any two sets in $S$ has non-empty intersection , what is the maximum possible value of $|S|$?
858
Is $\{\emptyset\}$ a subset of $\{\{\emptyset\}\}$?
90566
There exists surjections from A onto B and vice versa, and there is no bijection between the sets?
85225
The set of integers is not open or is open
61930
Intersection of Closed and Compact Set is Closed
74860
Why is the empty set a subset of every set?
110485
Nested sequence of non-empty compact subsets - intersection differs from empty set
130157
How to calculate the intersection of two sets?
55648
Intersection of finite number of compact sets is compact?
1307
Infimum and supremum of the empty set