mathematical set containing no elements
Factsheet
Notation β
Notation β
Wikipedia
en.wikipedia.org βΊ wiki βΊ Empty_set
Empty set - Wikipedia
3 days ago - Common notations for the empty set include "{ }", " ... {\displaystyle \emptyset } ", and "β
". The latter two symbols were introduced by the Bourbaki group (specifically AndrΓ© Weil) in 1939, inspired by the letter Γ (U+00D8 Γ LATIN CAPITAL LETTER O WITH STROKE) in the Danish and Norwegian ...
Cuemath
cuemath.com βΊ algebra βΊ empty-set
Empty Set - Definitions, Properties, Examples | Null Set
A set that does not contain any element is called an empty set or a null set. An empty set is denoted using the symbol 'β
'. It is read as 'phi'. Example: Set X = {}. It is also called a void set or null set.
Videos
02:08
The Empty Set or the Null Set , Intermediate Algebra , Lesson 27 ...
03:07
Why is the Empty Set a Subset of Every Set? | Set Theory, Subsets, ...
05:23
Class-11-Math Sets #3: What is an Empty set? Examples of Empty sets.
02:30
Null or Empty Set - YouTube
00:58
Empty set l. Null set #emptyset #nullset #set#mathshorts - YouTube
Empty Set - YouTube
What is a null or empty set?
A set which does not contain any element is called the empty set or the null set or the void set.
byjus.com
byjus.com βΊ maths βΊ empty-set
Empty Set Definition
What is an empty set example?
The set of natural numbers less than 1 is an empty set since the natural numbers start from 1, and hence, there will be no elements in the required set.
byjus.com
byjus.com βΊ maths βΊ empty-set
Empty Set Definition
How do you write an empty set?
A set with no elements is called an empty set and it can be written as { }.
byjus.com
byjus.com βΊ maths βΊ empty-set
Empty Set Definition
Top answer 1 of 2
1
According to Wikipedia AndrΓ© Weil (and maybe others) introduced the symbol 
for the empty set. They were inspired by the letter Γ in the Norwegian and Danish alphabet. So, I guess you could argue that the symbol should be pronounced as it is pronounced in these alphabets.
In my experience most mathematicians just call the symbol "empty set".
Note also, that the Wikipedia article says that the symbol is not to be confused with the Greek letter 
or 
.
2 of 2
0
Although not mathematics, I thought I would add that in the APL programming language the empty vector is represented by the symbol β¬, which is pronounced "zilde".
Teachoo
teachoo.com βΊ 7018 βΊ 1341 βΊ Empty-or-Null-set βΊ category βΊ Null-Set
Empty or Null set - Symbol, Definition and Questions - Teachoo
If number of elements in set is 0, it is an empty set.It is also called null set or void set.Example:A = {x: x is a natural number less than 1}Since, natural number = 1, 2, 3, 4, β¦There is no natural number less than 1Hence,A = {}or A is an ...
Wumbo
wumbo.net βΊ symbols βΊ empty-set
Empty Set Symbol (β
)
The 0 (zero) symbol is used in math to represent the number zero or nothing. ... An empty set, also called the null set, is respresented as a zero with a diagonal line through it or as an empty pair of curly braces.
Wikipedia
en.wikipedia.org βΊ wiki βΊ Null_sign
Null sign - Wikipedia
June 13, 2025 - The null sign (β
) is a symbol often used in mathematics for denoting the empty set. The same letter in linguistics represents zero, the lack of an element. It is commonly used in phonology, morphology, and syntax.
GeeksforGeeks
geeksforgeeks.org βΊ mathematics βΊ empty-set
Empty Set(Null Set): Definition, Notation, Properties, & Examples - GeeksforGeeks
July 26, 2023 - The empty set, null set, or void set is a set that does not include any elements. The symbol (phi) Ξ¦ represents the empty set and is written as Ξ¦ = { }.
CK-12 Foundation
ck12.org βΊ all subjects βΊ cbse math βΊ sets and its types βΊ what symbol denotes an empty or null set?
What symbol denotes an empty or null set? - Examples, Symbol, & Definition | CK-12 Foundation
September 11, 2025 - In mathematics, an empty set, also known as a null set, is a set that contains no elements. It is denoted by the symbol @$\begin{align*}\emptyset\end{align*}@$ or by @$\begin{align*}\{\}\end{align*}@$. For example, the set of all integers that are both even and odd is an empty set, because ...
BYJUS
byjus.com βΊ maths βΊ empty-set
Empty Set Definition
As we know, the outcomes of rolling ... elements and is called the empty set. The empty set is denoted by the symbol βΞ¦β and βΟβ or { }....
Published Β May 18, 2022 Views Β 31K
Encyclopedia Britannica
britannica.com βΊ science βΊ null-set
Null set | mathematics | Britannica
A second set could be defined as ... letting them be the twoβ¦Read More ... The empty (or void, or null) set, symbolized by {} or Γ, contains no elements at all....
Study.com
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Null Set Definition, Properties & Examples - Lesson | Study.com
July 7, 2016 - The null set is the set containing zero elements. So, any set containing no elements is defined to be the null set. This symbol is used to represent the empty set (or the null set).
SplashLearn
splashlearn.com βΊ home
Empty Set: Definition, Properties, Notation, Symbol, Examples
February 5, 2024 - Yes. Empty set has no elements in it. That implies its cardinal number is zero. Therefore, an empty set is considered a finite set. ... No, there is one element inside the brackets. So, it is a singleton set, not a null set.
Piliapp
piliapp.com βΊ symbols βΊ null-sign
β
Null Sign
The Null Sign, symbolized by β
, is used in set theory to denote the empty set.
CK-12 Foundation
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What is a null set in maths? - Symbol & Definition | CK-12 Foundation
September 11, 2025 - In mathematics, a null set, also known as an empty set, is a set that contains no elements. It is denoted by the symbol @$\begin{align*}\emptyset\end{align*}@$ or @$\begin{align*}\{\}\end{align*}@$. For example, the set of all integers that are both even and odd is a null set, because no integer ...
CK-12 Foundation
ck12.org βΊ all subjects βΊ cbse math βΊ sets and its types βΊ what is an empty or null set?
What is an empty or null set? - Symbol & Definition | CK-12 Foundation
September 11, 2025 - In mathematics, an empty set, also known as a null set, is a set that contains no elements. It is denoted by the symbol @$\begin{align*}\emptyset\end{align*}@$ or by @$\begin{align*}\{\}\end{align*}@$. For example, the set of all integers that are both even and odd is an empty set, because ...
Physics Read
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) in latex?
How to Write an Empty(or Null) Set Symbol(β
) in LaTeX?
September 24, 2025 - In LaTeX, the most commonly used command to represent the empty set is \emptyset. It is widely accepted and does not require any additional packages. \(p=\left \{ x:x^{2}=4,x\:is\:odd\right \} \) \( \therefore p=\emptyset \) ... In above code, the \: command is used to add extra space between words in the equation, improving readability. Alternatively, the \O command can be used for the same symbol.
Reddit
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to you?
r/mathematics on Reddit: What letter is the empty set symbol β
to you?
July 31, 2024 - So this does add an extra layer ... More replies More replies Β· Ornery-Anteater1934 Β· β’ 1y ago Β· β
is its own symbol, representing the Null Set....
Online Math Learning
onlinemathlearning.com βΊ empty-set.html
Empty Set Or Null Set And Equal Sets (video lessons, examples and solutions)
There are some sets that do not contain any element at all. For example, the set of months with 32 days. We call a set with no elements the null or empty set. It is represented by the symbol { } or Γ.
Reddit
reddit.com βΊ r/learnmath βΊ do β
and Ο both mean null set in set theory?
r/learnmath on Reddit: Do β
and Ξ¦ both mean null set in set theory?
April 22, 2023 -
My professor's slides use both, and I'm confused if they mean different things. In high school, we used the second representation of phi. Assuming the first one is also phi. I think.
Top answer 1 of 11
91
If both are being used in the context of the empty set then it could just be notational sloppiness from your professor.
2 of 11
60
Generally speaking, the first is the empty set and the second is phi, whatever that means in context. Often, when typesetting functionality is limited, phi is used to refer to the empty set β since using the conventional symbol might be very difficult or impossible.