Is empty set a subset of every subset?
16056
Is empty set element of every set if it is subset of every set?
19414
Uncountable subset with uncountable complement, without the Axiom of Choice
145781
Is the collection of all functions between two sets a set?
71976
Is every element on a set also a 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 $\geq 1\ldots$
123498
Is "empty set" an element of a set?
150825
Is an empty set equal to another empty set?
146891
Why is $\{\emptyset\} \not = \emptyset$?
44673
$M$ connected $\iff$ $M$ and $\emptyset$ are the only subsets of $M$ open and closed at the same time
125317
Is this statement "Every element in the empty set is greater than itself." true or its negation is true?
31212
The existence of the empty set is an axiom of ZFC or not?
132692
Nonempty set mapped to $\emptyset$ and vice-versa
272
Cantor Sets/nonempty/cardinality
110677
How is an empty set truly "empty"?
27107
intersection of the empty set and vacuous truth
134999
Writing empty set as union of basis elements for a topology.
136106
Is every open subset of $ \mathbb{R} $ uncountable?