Set Theory - Elementary Question on Empty Sets
118824
What is the complement of empty set?
46317
What is an Empty set?
56637
In naive set theory ∅ = {∅} = {{∅}}?
3072
If the empty set is a subset of every set, why isn't $\{\emptyset,\{a\}\}=\{\{a\}\}$?
125502
Empty set literal?
77286
Proving set theory question
31212
The existence of the empty set is an axiom of ZFC or not?
44673
$M$ connected $\iff$ $M$ and $\emptyset$ are the only subsets of $M$ open and closed at the same time
125957
What is the product of the empty set?
61747
Proof of exchange principle in set theory
155233
$A=\emptyset $ if and only if $B = A \bigtriangleup B$
71653
Why is the Cartesian product of a set $A$ and empty set an empty set?
108922
Cardinality and infinite sets: naturals, integers, rationals, bijections
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 $\geq 1\ldots$
75966
Prove that if $A$ is a set with $m$ elements, $B$ is a set with $n$ elements, and $A \cap B = \emptyset$, then $A \cup B$ has $m+n$ elements.
20706
Non-existence of a Surjective Function from a Set to Its Subsets (Cantor's theorem)
82315
is an empty set an element of {empty set}