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In type theory, a type with no terms
In type theory, an empty type or absurd type, typically denoted 0 {\displaystyle \mathbb {0} } is a type with no terms. Such a type may be defined as the
Empty_type
Type that allows only one value
or empty type, which allows no values and is the initial object in this category. Similarly, the Boolean is the type with two values. The unit type is
Unit_type
Universal subtype in logic and computer science
bottom type is inhabited, it is then different from the empty type. If a type system is sound, the bottom type is uninhabited and a term of bottom type represents
Bottom_type
Mathematical theory of data types
The empty type has no terms. The type is usually written ⊥ {\displaystyle \bot } or 0 {\displaystyle \mathbb {0} } . One use for the empty type is proofs
Type_theory
Linked node hierarchical data structure
children(node(e, f)) = f In terms of type theory, a tree is an inductive type defined by the constructors nil (empty forest) and node (tree with root node
Tree_(abstract_data_type)
Encapsulation of an optional value in programming or type theory
return type of functions which may or may not return a meaningful value when they are applied. It consists of a constructor which either is empty (often
Option_type
Mathematical set containing no elements
In mathematics, the empty set or void set is the unique set having no elements; its size or cardinality (count of elements in a set) is zero. Some axiomatic
Empty_set
an empty type environment, such an M is said to be an inhabitant of τ {\displaystyle \tau } . In the case of simply typed lambda calculus, a type has
Type_inhabitation
Alternative foundation of mathematics
canonical terms. Because the 0 type contains no terms, it is also called the empty type. It is used to represent anything that cannot exist. It is also written
Intuitionistic_type_theory
Sense of generalized boredom, social alienation and apathy
Emptiness as a human condition is a sense of generalized boredom, social alienation, nihilism, and apathy. Feelings of emptiness often accompany dysthymia
Emptiness
Data type defined by combining other types
programming and type theory, an algebraic data type (ADT) is a composite data type, i.e. a type formed by combining other types. An algebraic data type is defined
Algebraic_data_type
Data having only values "true" or "false"
explicit Boolean data type, like C90 and Lisp, may still represent truth values by some other data type. Common Lisp uses an empty list for false, and any
Boolean_data_type
Return type for functions that do not output values when called
type denotes the empty type, which has no inhabitants. A function into the void type does not return results, and a side-effectful program with type signature
Void_type
1980 studio album by Pete Townshend
Empty Glass is the third solo studio album by the English rock musician Pete Townshend, and his first composed of original material, released on 21 April
Empty_Glass
Symbol used in mathematics and logic
semantics The bottom type in type theory, which is the bottom element in the subtype relation. This may coincide with the empty type, which represents absurdum
Up_tack
Aircraft weight without fuel or payload
Empty weight (EW) is the sum of the ‘as built’ manufacturer's empty weight (MEW), plus any standard items (SI) plus any operator items (OI), EW = MEW
Operating_empty_weight
as: final myTree = Node(42, Node(0, Empty(), Empty()), Empty()); In Elm, an ADT may be defined with: type Tree = Empty | Node Int Tree Tree And instantiated
Comparison of programming languages (algebraic data type)
Comparison_of_programming_languages_(algebraic_data_type)
Unique string of length zero
In formal language theory, the empty string, also known as the empty word or null string, is the unique string of length zero. Formally, a string is a
Empty_string
Mathematical model for data types
function empty(S) and a create() operation that returns an initial stack instance. In the axiomatic semantics, letting S {\displaystyle S} be the type of stack
Abstract_data_type
Linguistics concept
there are different types of empty categories that each appear to account for locality violations in different environments. Empty categories are present
Empty_category
In shedding-type games, the player's objective is to empty one's hand of all cards or tiles before all other players. In these games, players win by having
List_of_shedding-type_games
Result from multiplying no factors
In mathematics, an empty product, or nullary product or vacuous product, is the result of multiplying no factors. It is by convention equal to the multiplicative
Empty_product
Conditional statement which is true because the antecedent cannot be satisfied
empty collection. In Agda, an empty type (for example, ⊥, which is defined with no constructors) is 'false' at the type level, following the Curry–Howard
Vacuous_truth
2024 single by Linkin Park
"The Emptiness Machine" is a song by American rock band Linkin Park. It was released as the lead single from the band's eighth studio album, From Zero
The_Emptiness_Machine
Ecosystem that is void of large mammals
Empty forest is a term coined by Kent H. Redford's article "The Empty Forest" (1992), which was published in BioScience. An "empty forest" refers to an
Empty_forest
Relationship between programs and proofs
disjunction as a sum type (this type may be called a union), the false formula as the empty type and the true formula as a unit type (whose sole member
Curry–Howard_correspondence
Data type that refers to itself in its definition
constructor and methods... } This indicates that non-empty list of type E contains a data member of type E, and a reference to another List object for the
Recursive_data_type
Novelty book containing blank pages
Empty books or blank books are novelty books whose title indicates that they treat some serious subject, but whose pages have been left intentionally
Empty_book
British single-seat WWII fighter aircraft
the Type 300. On 1 December 1934, the Air Ministry issued contract AM 361140/34, providing £10,000 for the construction of Mitchell's improved Type 300
Supermarine_Spitfire
1st episode of the 3rd series of Sherlock
"The Empty Hearse" is the first episode of the third series of the BBC television series Sherlock. It was written by Mark Gatiss and stars Benedict Cumberbatch
The_Empty_Hearse
Fictional location
are usually portrayed as an impossibly large extradimensional complex of empty rooms, accessed by exiting reality. They are one of the best-known examples
The_Backrooms
Rules defining correctly structured Java programs
Since Java SE 7, it is possible to use an empty type list, <> (sometimes called a "diamond"), in place of type arguments, in which case the latter will
Java_syntax
Universal type in logic and computer science
structural type system, the empty structure serves as a top type. For example, objects in OCaml are structurally typed; the empty object type (the type of objects
Any_type
Finite ordered list of elements
where n is a non-negative integer. There is only one 0-tuple, called the empty tuple. A 1-tuple and a 2-tuple are commonly called a singleton and an ordered
Tuple
In computational geometry, the largest empty rectangle problem, maximal empty rectangle problem or maximum empty rectangle problem, is the problem of finding
Largest_empty_rectangle
Type of pasta
Capunti is a type of short convex oval pasta resembling an open empty pea pod. Media related to Capunti at Wikimedia Commons Italy portal Food portal List
Capunti
identifier.</param> type UserId(id: Guid) = member x.id = id static member New() = Guid.NewGuid() static member Empty = Guid.Empty override x.Equals(b)
Strongly_typed_identifier
Relational database programming language
relational algebra and tuple relational calculus, SQL consists of many types of statements, which may be informally classed as sublanguages, commonly:
SQL
Computer science concept
intersection of a type and an ancestor type (such as its parent) is the most derived type. The intersection of sibling types is empty. The Forsythe language
Type_system
[citation needed] An image club (イメージクラブ, imējikurabu), or imekura (イメクラ), is a type of brothel in Japan similar to fashion health parlors, differing in that
Types of prostitution in modern Japan
Types_of_prostitution_in_modern_Japan
One of the core concepts of traditional Chinese medicine diagnosis
urination, constipation and excess pulse type. There are four types of empty: Empty Qi Empty Yang Empty Blood Empty Yin Yin and yang are also categorised
Eight_principles
Finite, ordered collection of items
the empty list, nil. In fact, this is the free monoid over the set of list elements. Look up list in Wiktionary, the free dictionary. Array data type –
List_(abstract_data_type)
2013 book by Bill Dedman and Paul Clark Newell, Jr.
Empty Mansions: The Mysterious Life of Huguette Clark and the Spending of a Great American Fortune is a non-fiction book by the American authors Bill
Empty_Mansions
Form of diabetes mellitus
from c. 1500 BCE mentioning "too great emptying of the urine." The first described cases are believed to be of type 1 diabetes. Indian physicians around
Type_2_diabetes
High-level programming language
interpreted as an empty object and the result of the expression is "[object Object]" as expected. JavaScript is dynamically typed like most other scripting
JavaScript
Attribute of data
corresponds to a product type similar to a tuple or record. A constructor with no fields corresponds to the empty product (unit type). If all constructors
Data_type
2000 novel by Jeffery Deaver
The Empty Chair is a crime novel by American writer Jeffery Deaver, published in 2000. It is the third novel in a series featuring Lincoln Rhyme; the
The_Empty_Chair_(novel)
2014 historical novel by Bernard Cornwell
The Empty Throne is the eighth historical novel in The Saxon Stories series by Bernard Cornwell, first published in October 2014. It is set in 10th-century
The_Empty_Throne
Set of elements common to all of some sets
case, the empty collection has an intersection equal to the whole underlying set. Also, in type theory x {\displaystyle x} is of a prescribed type τ , {\displaystyle
Intersection_(set_theory)
Feature of some programming languages
saying that the variable is empty, a need that arises in many circumstances. This need can be achieved with a nullable type. In programming languages like
Nullable_type
Index of articles associated with the same name
S-Type is the name of two vehicles: Jaguar S-Type (1963) (1963–1968) Jaguar S-Type (1999) (1999–2008) 1963–1968 Jaguar S-Type 1999–2007 Jaguar S-Type This
Jaguar_S-Type
1992 single by Manic Street Preachers
"Motorcycle Emptiness" is a song by Welsh alternative rock band Manic Street Preachers. It was released on 1 June 1992 through Columbia Records. It was
Motorcycle_Emptiness
Group of endocrine diseases characterized by high blood sugar levels
and nerves. The major types of diabetes are type 1 and type 2. The most common type is type 2. The most common treatment for type 1 is insulin replacement
Diabetes
English actor, memoirist and novelist (1910–1983)
school to pay a call on Mr Croome but he found the place abandoned and empty. While attending school – as was customary for the time – Niven received
David_Niven
General-purpose programming language
2025. Retrieved 28 February 2026. 'stubs' - files containing only type information, empty of runtime code (the filename ends in .pyi). Hammond, Mark; von
Python_(programming_language)
1977 live album / studio album by Jackson Browne
Running on Empty is the fifth album by American singer-songwriter Jackson Browne. Featuring songs themed around life on the road, the entire album was
Running_on_Empty_(album)
Special objects used in (mathematical) category theory
frequently in cohomology theories. In the category of types the empty type is the initial object and the unit type is the terminal object. Initial and terminal
Initial_and_terminal_objects
Desert in the Arabian Peninsula
The Rub' al Khali (/ˈrʊb æl ˈkɑːli/; Arabic: ٱلرُّبْع ٱلْخَالِي, lit. 'Empty Quarter', [ar.rʊbʕ‿al.χaːliː]) is a desert encompassing most of the southern
Rub'_al_Khali
Computer markup language
by a "Z" after the geometry type and geometries with a linear referencing system have an "M" after the geometry type. Empty geometries that contain no
Well-known text representation of geometry
Well-known_text_representation_of_geometry
Concept in computer science
Collects c where type Elem c empty :: c insert :: Elem c -> c -> c toList :: c -> [Elem c] instance Collects [e] where type Elem [e] = e empty = [] insert
Type_family
distribution and several distinct populations or types have been documented or suggested. Three to five types of orcas may be distinct enough to be considered
Orca_types_and_populations
Notation for tree data structures
Hybrid Hybrid → empty | "#" Type integer -- The #i part is an obligatory identifier for a hybrid node Type → empty | string -- type of reticulation,
Newick_format
Various types of matches used in professional wrestling
Many types of wrestling matches, sometimes called "gimmick matches" in the jargon of the business, are performed in professional wrestling. Some gimmick
Professional wrestling match types
Professional_wrestling_match_types
Empty Stares was an alternative rock band from Philadelphia, Pennsylvania, U.S. that was formed in 1992 and ended in 1997. In those five years, Empty
Empty_Stares
Inference rule defining when a program phrase has a type
{\displaystyle x} has type τ {\displaystyle \tau } . A closed expression, having no free variables, is commonly typed under the empty context ∅ {\displaystyle
Typing_rule
Japanese carrier-based fighter aircraft
Navy (IJN) from 1940 to 1945. The A6M was designated as the Mitsubishi Navy Type 0 carrier fighter (零式艦上戦闘機, rei-shiki-kanjō-sentōki), or the Mitsubishi A6M
Mitsubishi_A6M_Zero
Abstract data type
In computer science, a queue is an abstract data type that serves as an ordered collection of entities. By convention, the end of the queue where elements
Queue_(abstract_data_type)
Antenna constructions for different applications
This article gives a list of brief summaries of multiple different types of antennas used for radio receiving or transmitting systems. Antennas are typically
Antenna_types
Shedding-type card game
deck and the objective is for a player to empty their own hand while preventing other players from emptying theirs. The game is commonly played in South
One-card
Computer file containing no data
directory to ensure that it is not empty since some tools (such as backup and revision control software) ignore an empty directory. The presence or absence
Zero-byte_file
Features of the Java programming language
type system to allow "a type or method to operate on objects of various types while providing compile-time type safety". The aspect compile-time type
Generics_in_Java
Medical symptoms including a sense of suffocation despite a clear airway
Empty nose syndrome (ENS) is a clinical syndrome in which there is a sensation of suffocation despite a clear airway. This syndrome is often referred
Empty_nose_syndrome
Printing technology and system based on reconfigurable blocks of glyphs
printed with movable copper type, while over the Zihao there is an empty square hole—apparently the associated copper metal type was lost. Another sample
Movable_type
The idea of one-hand typing is to touch type using only one hand (e.g. the left one), or mainly one hand. Its history and application are closely related
One-hand_typing
Software component enabling a Java application to interact with a database
driver) Database-Protocol driver (Pure Java driver) or thin driver. The JDBC type 1 driver, also known as the JDBC-ODBC bridge, is a dbase driver implementation
JDBC_driver
Type theory in logic and mathematics
insistence of all presentations of the Martin-Löf type theory on the property that the identity types, in the empty context, may contain only reflexivity, Voevodsky
Homotopy_type_theory
1976 film
Shadows in an Empty Room (Italian: Una magnum special per Tony Saitta) is a 1976 film starring Stuart Whitman as a tough Dirty Harry type who sets out
Strange Shadows in an Empty Room
Strange_Shadows_in_an_Empty_Room
comparison of the features of the type systems and type checking of multiple programming languages. Brief definitions A nominal type system means that the language
Comparison of programming languages by type system
Comparison_of_programming_languages_by_type_system
Markup language for documents
document's MIME type is set to text/html. For both HTML and XHTML, this comes from the HTTP Content-Type header sent by the server. Change the XML empty-element
HTML
2018 single by James Arthur
Retrieved 15 May 2025. Type Empty Space in the "Search:" field and press Enter. "British single certifications – James Arthur – Empty Space". British Phonographic
Empty_Space_(song)
Free software library
the non-classed built-in fundamental types are: an empty type, corresponding to C's void (G_TYPE_NONE); types corresponding to C's signed and unsigned
GObject
Command-line utility
To test whether a file is nonexistent or empty, type: if test ! -s "$1" then echo $1 does not exist or is empty. fi If the file specified by the first positional
Test_(Unix)
Programming language
Any in C++ and Rust and is satisfied by any type, including built-in types like int. Code using the empty interface cannot simply call methods (or built-in
Go_(programming_language)
Japanese company
Notes Co., Ltd, doing business as Type-Moon, is a Japanese media conglomerate that produces video games, anime, manga, light novels, and affiliated merchandise
Type-Moon
2004 studio album by Kings of Convenience
British Phonographic Industry. Select albums in the Formats field. Type Riot on an Empty Street Kings of Convenience in the "Search:" field. "Kings Of Convenience
Riot_on_an_Empty_Street
In computing, a condition where an expression does not have a correct value
correct. An undefined value must not be confused with empty string, Boolean "false" or other "empty" (but defined) values. Depending on circumstances, evaluation
Undefined_value
Wikipedia includes several lists of watercraft types. Note that "type" may refer to the physical characteristics or the intended purpose of the vessel
Lists_of_watercraft_types
1977 apocalyptic fiction novel by John Christopher
Empty World is a 1977 apocalyptic fiction novel written by John Christopher aimed at an adolescent audience. It was Christopher's eleventh such novel
Empty_World
Automated message from an email system
has triggered the auto reply, and this response is typically sent with an empty Return-Path; otherwise auto responders could be trapped in sending auto
Bounce_message
Russian assault rifle and variants
attaching various accessories. It has a barrel length of 415 mm (16.3 in), an empty weight of 3.5 kg (7.72 lb) a maximum firing range of 800 m (870 yd), and
AK-12
Medical condition
is CT scan and MRI scans. There are two types of empty sella syndrome: primary and secondary. Primary empty sella syndrome occurs when a small anatomical
Empty_sella_syndrome
Assault rifle made in North Korea derived from the Soviet AKM
The Type 68 (Korean: 68식자동보총, also known as Type 68 NK) is an assault rifle made in North Korea derived from the Soviet AKM designed by Mikhail Kalashnikov
Type_68_assault_rifle
Formal languages for expressing mathematical theories
their proofs, and the question of provability became a question of non-emptiness (type inhabitation); de Bruijn was unaware of Howard's work, and stated the
Automath
Type of computer file
sparse file is a type of computer file that attempts to use file system space more efficiently when the file itself is partially empty. This is achieved
Sparse_file
Type system used in computer programming and mathematics
A Hindley–Milner (HM) type system is a classical type system for the lambda calculus with parametric polymorphism. It is also known as Damas–Milner or
Hindley–Milner_type_system
Result of multiplying types in type theory
programming languages and type theory, a product of types is another, compounded, type in a structure. The "operands" of the product are types, and the structure
Product_type
Control flow operator in functional programming
deleted when the continuation is applied, the type β is never used and may be taken to be ⊥, the empty type. The principle of double negation elimination
Call-with-current-continuation
Call-with-current-continuation
Programming language concept
annotation saying that the map type constructor is covariant in the result type. module type S = sig type key type (+'a) t val empty: 'a t val mem: key -> 'a
Type_variance
Mathematical constructs and creation rules
In type theory, a system has inductive types if it has facilities for creating a new type from constants and functions that create terms of that type. The
Inductive_type
Japanese battle rifle
The Howa Type 64 battle rifle (64式自動小銃, Roku-yon-shiki-jidou-shoujuu), referred to as the Type 64 7.62mm rifle (64式7.62mm小銃), is a Japanese battle rifle
Howa_Type_64
travel, tourism, insurance
EMPTY TYPE
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EMPTY TYPE
travel, tourism, insurance