the difference between $\emptyset$ and $\{\emptyset\}$?
68244
Is ∅ equivalent to {∅}?
143003
$\bigcup \emptyset$ is defined but $\bigcap \emptyset$ is not. Why?
31376
If null set is an element of a set then will it belongs to set or subset?
135638
The difference between \e and ^[
51434
What does the symbol $\subset\subset$ mean?
47562
Confusion in symbol of subset.
71653
Why is the Cartesian product of a set $A$ and empty set an empty set?
84609
Unary intersection of the empty set
5528
Difference between $:=$ and $=$
125957
What is the product of the empty set?
23586
What is the difference between String.Empty and "" (empty string)?
144361
string.IsNullOrEmpty(string) vs. string.IsNullOrWhiteSpace(string)
93676
Syntax of Using Math Mode: Empty Lines (Beginner Question)
125161
Why is the Cartesian product of $A$ and $\varnothing$ empty?
132716
how to typeset empty inner product
55995
Why is the supremum of the empty set $-\infty$ and the infimum $\infty$?
109219
How do the sets $\emptyset\times B,\ A\ \times \emptyset, \ \emptyset \times \emptyset $ look like?