Is ∅ equivalent to {∅}?
107215
Is $\emptyset \in \emptyset$ or $\emptyset \subseteq \emptyset$?
84609
Unary intersection of the empty set
62542
Why is the empty set considered an interval?
141318
$\subset$ vs $\subseteq$ when *not* referring to strict inclusion
28523
When would the intersection of the empty set mean anything?
102136
How many subsets contain no consecutive elements?
3148
True or false: {{∅}} ⊂ {∅,{∅}}
58285
Is it true that if $X$ is connected, then for every nonempty proper subset $A$ of $X$, we have $\mathbf{Bd} \ne \emptyset$
150857
Equivalence relations on S given no relation?
130418
Is ${\{\emptyset,\{\emptyset\},\{\{\emptyset\}\},\{\{\{\emptyset\}\}\},...\}} $ a set?
97951
Is the void set (∅) a proper subset of every set?
158600
Are these two statements equivalent?
39020
Why is empty set an open set?
130998
Is $\exists x \in A ~:~ P(x)$ the same as $\exists x ~:~ x \in A \implies P(x)$
118824
What is the complement of empty set?
5639
No \xrightrightarrow[a]{b}?
3072
If the empty set is a subset of every set, why isn't $\{\emptyset,\{a\}\}=\{\{a\}\}$?