In mathematics, an associahedron "K" is an ("n" − 2)-dimensional convex polytope in which each vertex corresponds to a way of correctly inserting opening and closing parentheses in a word of "n" letters and the edges correspond to single application of the associativity rule.
 Equivalently, the vertices of an associahedron correspond to the triangulations of a regular polygon with "n" + 1 sides and the edges correspond to edge flips in which a single diagonal is removed from a triangulation and replaced by a different diagonal.
 Associahedra are also called Stasheff polytopes after the work of Jim Stasheff, who rediscovered them in the early 1960s after earlier work on them by Dov Tamari.
The Vern Riffe State Office Tower is a 503-foot-tall (153 m) skyscraper in Columbus, Ohio.
 It was completed in 1988 and has 32 floors.
 NBBJ designed the building, which is the fifth-tallest in Columbus, and has 102,192 m² of floor area.
 An earlier concept for the site, also designed by NBBJ, would have included a site to the west of the present location, and would have effectively closed off South Wall Street north of West State Street.
 The building was named for Vernal G. Riffe, Jr, who served as Speaker of the Ohio House of Representatives from 1975 to 1994.
 The complex also contains the 854-seat Capitol Theatre.
The War of the Roses is a 1989 American black comedy film based upon the 1981 novel of the same name" by Warren Adler.
 The film follows a wealthy couple with a seemingly perfect marriage.
 When their marriage begins to fall apart, material possessions become the center of an outrageous and bitter divorce battle.
The South Central Pennsylvania cities of Lancaster and York have a historical rivalry in all sporting events from the high-school level to the professional.
 Since both cities are named after the English cities of Lancaster and York, the former Pennsylvania baseball teams were named for the opposing sides of the Wars of the Roses.
 As a metaphor, "War of the Roses" describes the intense baseball matches fought between the Lancaster Red Roses and the York White Roses.
 With the addition of York to the Atlantic League, the Barnstormers continue the Red Roses' tradition as they battle the York Revolution for lower Susquehanna supremacy.
A Dyson sphere is a hypothetical megastructure that completely encompasses a star and captures most or all of its power output.
 The first known mention of the concept of a star enclosed by a sphere was in an early Indo-European religious creation myth which described the prenatal sun as being enclosed (imprisoned) by rock.
 The first contemporary description of the structure was by Olaf Stapledon in his science fiction novel "Star Maker" (1937), in which he described "worlds constructed of a series of concentric spheres" and a similar galactic-scale natural formation of a "rocky sphere that had once been a galaxy."
 The concept was later popularized by Freeman Dyson in his 1960 paper "Search for Artificial Stellar Sources of Infrared Radiation".
 Dyson speculated that such structures would be the logical consequence of the escalating energy needs of a technological civilization and would be a necessity for its long-term survival.
 He proposed that searching for such structures could lead to the detection of advanced, intelligent extraterrestrial life.
 Different types of Dyson spheres and their energy-harvesting ability would correspond to levels of technological advancement on the Kardashev scale.
Mercedes-Benz G500 4×4² was an earlier concept vehicle bought into production in 2015.
 The vehicle was fitted with 4.0-litre bi-turbo V8 petrol engine delivering 416 bhp and 450 lb ft of torque.
 The model is the shorter and practical version of Mercedes-Benz G63 AMG 6x6.
In computer algebra, the Gröbner fan of an ideal in the ring of polynomials is a concept in the theory of Gröbner bases.
 It is defined to be a fan consisting of cones that correspond to different monomial orders on that ideal.
 The concept has been introduced by Mora and Robbiano in 1988.
The post-resurrection appearances of Jesus are the earthly appearances of Jesus to his followers after his death, burial and resurrection.
 Believers point to them as proof of the Resurrection of Jesus and his identity as Messiah, seated in heaven on the right hand of God (the doctrine of the Exaltation of Christ).
 There is a strong early tradition that the family and immediate followers of Jesus, and the Paul the Apostle, had visionary and mystical experiences of Jesus after his death.
 Several decades later, when the gospels of Matthew, Luke and John were being written, the emphasis had shifted to the physical nature of the resurrection, while still overlapping with the earlier concept of a divine exaltation of Jesus' soul.
 This development can be linked to the changing make-up of the Christian community: Paul and the earliest Christ-followers were Jewish, and Second Temple Judaism emphasised the life of the soul; the gospel-writers, in an overwhelmingly Greco-Roman church, stressed instead the pagan belief in the hero who is immortalised and deified in his physical body.
Referential density is a concept of ficto-narrative theory put forward by Thomas G. Pavel in his 1986 book, "Fictional Worlds".
 The concept refers to the referential relationship of a text to a fictional world, the ontology of which can be established by a possible worlds approach.
 A large text that refers to a small fictional world is said to have low referential density, whereas a small text referring to a large fictional world has high referential density.
 The size of the text is measured in abstract terms as amplitude, which in most cases will correspond to its physical length; exceptions to this may arise in cases of embedded discourses, such as metanarratives (or imaging digressions), which refer to the actual world.
 For this reason, the form and genre of a fictional work provide only an approximate indication of its size; by the same token, it is possible to refer to the size and referential density of part of a fictional work.
 The size of a fictional world, in turn, is measured in terms of the sum total of properties applicable to the objects and agents inhabiting the fictional world.
Black comedy or dark comedy is a comic style that makes light of subject matter that is generally considered taboo.
 Literary critics have associated black comedy and black humor with authors as early as the ancient Greeks with Aristophanes.
 Black comedy corresponds to the earlier concept of gallows humor.

Question: What earlier concept does the style of comedy that The War of the Roses employs correspond to?
Answer: gallows humor