Several fields of discrete mathematics, particularly theoretical computer science, graph theory, and combinatorics, are important in addressing the challenging bioinformatics problems associated with understanding the tree of life.

Several institutions, besides those already mentioned, played important parts.

Several billion kilograms of polyesters are produced industrially annually, important products being polyethylene terephthalate, acrylate esters, and cellulose acetate.

Several important cinematic movements, including the Nouvelle Vague, began in the country.

Several types are existent in Qing dynasty and used in dishes of stewing hams ( 火腿炖肘子 ), and vegetables, or for a wide variety of soup and important soup stocks.

Several important institutional changes took place in this period, such as free and mandatory schooling introduced 1842 ( as first country in the world ), the abolishment of a previous national monopoly on trade in handicrafts in 1846, and a stock company law in 1848.

His critically acclaimed book Lyrics on Several Occasions of 1959, an amalgam of autobiography and annotated anthology, is an important source for studying the art of the lyricist in the golden age of American popular song.

Several formerly important franchise courts were not officially abolished until Courts Act of 1971.

Several important buildings and structures were built during this time, including the Kansas City City Hall and the Jackson County Courthouse — both added new skyscrapers to the city's growing skyline.

Several industry groups also recognize light pollution as an important issue.

Several types of molecules are particularly important during morphogenesis.

Several of the more important ways observations can be affected by human psychology are given below.

Several other important engravers also made cards, including Master ES and Martin Schongauer.

Several economically important products come from Rosaceae, including many edible fruits ( such as apples, apricots, plums, cherries, peaches, pears, raspberries, and strawberries ), almonds, and ornamental trees and shrubs ( such as roses, meadowsweets, photinias, firethorns, rowans, and hawthorns ).

Several important political innovations of classical antiquity came from the Greek city-states and the Roman Republic.

Several Referendums supported the state being in control of the most important utilities and energy companies.

Several important modern cities, including Stockholm and Lviv, were founded in the 1250s.

Several important cultural achievements were made in the decade, including publication of Roger Bacon's important scientific work Opus Majus and Thomas Aquinas ' Summa contra Gentiles.

Several lakesthe most important of which are Lake Herăstrău, Lake Floreasca, Lake Tei, and Lake Colentinastretch across the northern parts of the city, along the Colentina River, a tributary of the Dâmbovița.

Several singular oak trees, such as the Royal Oak in Britain and the Charter Oak in the United States, are of great historical or cultural importance ; for a list of important oaks, see Individual oak trees.

Several important trade routes from India and China ( including the Silk Road ) passed through Bactria and, as early as the Bronze Age, this had allowed the accumulation of vast amounts of wealth by the mostly nomadic population.

Several of Gauthier's students are now important moral, political, and legal philosophers in the United States and Canada.

Several important features of visual perception can be traced to the retinal encoding and processing of light.

Several important diseases of the nervous system are associated with dysfunctions of the dopamine system.

Several of the buildings on the Brown campus from its founding 18th century period through the 20th century offer fine representation of the Georgian style of American colonial era architecture.

Several attempts were made in the first half of the 20th Century to formalize the notion of computability:

Several are known to have occurred in Indo-European languages, including the presumed original Proto-Indo-European words for bear (* rkso ), wolf (* wlk < sup > w </ sup > o ), and deer ( originally, hart — although the word hart remained commonplace in parts of England until the 20th century as is witnessed by the widespread use of the pub sign The White Hart ).

Several books after the middle of the 20th century contributed to the rise of American environmentalism ( as distinct from the longer-established conservation movement ), especially among college and university students and the more literate public.

Several hundred more were probably caught by American and European whalemen in the Sea of Okhotsk from the 1840s to the early 20th century.

* Several pre-1950 talkies were sold to other studios for remakes, among them Dr. Jekyll and Mr. Hyde ( 1931 ) and Make Me a Star ( 1932 ) to MGM ; The Letter ( 1929 ), A Farewell to Arms ( 1932 ) and One Sunday Afternoon ( 1933 ) to Warner Brothers ; and " The Dance of Life ( 1929 ), The Story of Temple Drake ( 1933 ) and " Swing High, Swing Low ( 1937 ) to 20th Century Fox.

Several 20th century Prime Ministers, such as David Lloyd George and Winston Churchill, were famous for their oratorical skills.

Several fields of science and especially medicine seem to make liberal use of ideas in process philosophy, notably the theory of pain and healing of the late 20th century.

Several 30-contact relays in " Connector " circuits in mid 20th century 1XB switch and 5XB switch telephone exchanges ; cover removed on one

Several post-Heideggerian authors contributing to the Continental philosophy of science in the second half of the 20th century include Jürgen Habermas ( e. g., " Truth and Justification ", 1998 ), Carl Friedrich von Weizsäcker (" The Unity of Nature ", 1980 ), and Wolfgang Stegmüller (" Probleme und Resultate der Wissenschafttheorie und Analytischen Philosophie ", 1973 – 1986 ).

Several additional horological artefacts are also displayed, documenting the history of precision timekeeping for navigational and astronomical purposes, including the mid 20th century Russian-made F. M.

Several short-lived boom towns sprang up during the late 19th and early 20th centuries to mine gold and silver.

Several had long-standing diasporas that did not conform to 20th century European nationalism and state creation.

Several members of the 20th century Heaven's Gate cult were found to have been castrated, apparently voluntarily and for the same reasons.

Several times in the early 20th century, the lake swelled with runoff and flooded the lower-lying portions of town.

Several films jumped on the calypso craze in 1957 such as Island in the Sun ( 20th Century Fox ) that featured Belafonte and the low-budget films Calypso Joe ( Allied Artists ), Calypso Heat Wave ( Columbia Pictures ), and Bop Girl Goes Calypso ( United Artists ).

Several schools of the philosophy of mathematics ran into difficulties one after the other in the 20th century, as the assumption that mathematics had any foundation that could be consistently stated within mathematics itself was heavily challenged by the discovery of various paradoxes ( such as Russell's paradox ).

Several entities with the name " Far East " had existed in the first half of the 20th century, all with rather different boundaries:

Several white American writers collected Gullah stories in the late 19th and early 20th centuries.

Several copies remain intact, although two of the most famous, the Houghton Shahnameh and the Great Mongol Shahnameh, were broken up for sheets to be sold separately in the 20th century.

Several measures were taken in the 20th century to preserve this part of the city.

Several small studies conducted in the early 20th century demonstrated the presence of curved rods in the stomach of many patients with peptic ulcers and stomach cancer.

Several important 20th century photographers began their careers in a pictorialist style but transitioned into sharply-focused photography by the 1930s.

Several New Zealand and South Seas Exhibitions were held in the latter part of the 19th century and early 20th century in New Zealand:

Several major highways were also completed during the 20th century.