Many philosophers have attempted to reduce the number of distinct ontological categories.

Many significant areas of mathematics can be formalised as categories, and the use of category theory allows many intricate and subtle mathematical results in these fields to be stated, and proved, in a much simpler way than without the use of categories.

Many of the above concepts, especially equivalence of categories, adjoint functor pairs, and functor categories, can be situated into the context of higher-dimensional categories.

Many new categories of disorder were introduced, while some were deleted or changed.

Many extremophiles fall under multiple categories and termed as polyextremophiles.

Many specialist sub-disciplines within the broader maritime and underwater archaeological categories have emerged in recent years.

Many production racing categories are based on particular makes of cars.

Many other categories ( such as the category of groups, with group homomorphisms as arrows ) add structure to the objects of the category of sets and / or restrict the arrows to functions of a particular kind.

Many designs have been put forward for linear motors, falling into two major categories, low-acceleration and high-acceleration linear motors.

Many grammars also draw a distinction between lexical categories and functional categories.

Many grammars draw a distinction between lexical categories and functional categories.

Many phrasal categories are assumed that do not correspond directly to a specific part of speech, e. g. agreement phrase ( AgrP ), focus phrase ( FP ), inflection phrase ( IP ), tense phrase ( TP ), etc.

Many fruits commonly referred to as berries are not actual berries by the scientific definition, but fall into one of these categories:

Many important categories in mathematics ( such as the category of sets ), although not small, are at least locally small.

Many human-edited directories, including the Open Directory Project, Salehoo and World Wide Web Virtual Library, are edited by volunteers, who are often experts in particular categories.

Many media players, especially those designed to play music, display available songs in a format known as a media library, which allows the user to organize their music by categories such as artist, album, genre, year, and rating.

Many traditionally print-comics focused organizations have added award categories for comics published on the web.

Many important categories have obvious interpretations as concrete categories, for example the category of topological spaces and the category of groups, and trivially also the category of sets itself.

Many industries, notably textiles, firearms, clocks and watches, buttons, horse-drawn vehicles, railroad cars and locomotives, sewing machines, and bicycles, saw expeditious improvement in materials handling, machining, and assembly during the 19th century, although modern concepts such as industrial engineering and logistics had not yet been named.

Many involve habitation or industrial elements.

Many industrial investments were done by the Italians in the area of Asmara and Massawa, but the beginning of World War II stopped the blossoming industrialization of Eritrea.

Many Nkrumah-era investments were monumental public works projects which were assets for the country, agricultural and industrial schemes.

Many survived through time or staged a comeback in industrial times.

Many artifacts from the Khazars, exhibiting their artistic and industrial talents, have survived to the present day.

Many European Soviet citizens and much of Russia's industry were relocated to Kazakhstan during World War II, when Nazi armies threatened to capture all the European industrial centers of the Soviet Union.

Many libertarian socialists argue that large-scale voluntary associations should manage industrial manufacture, while workers retain rights to the individual products of their labor.

Many more microprocessors are part of embedded systems, providing digital control of a myriad of objects from appliances to automobiles to cellular phones and industrial process control.

Many microbes are used for commercial and industrial production of chemicals, enzymes and other bioactive molecules.

Many other fields in the production engineering and design engineering and heavy industrial have project managers.

Many of the other industrial activities are limited to small scale manufacturing, particularly agro-processing and import substitution.

Many Silesian residents not only resented the Germans for their invasion in 1939, but now also the newly formed Polish communist government for their population shifting and interference in agricultural, as well as industrial, affairs.

Many industrial processes rely on reactions using chemicals dissolved in water, suspension of solids in water slurries or using water to dissolve and extract substances.

Many of his works discuss ethical aspects of industrial inventions and processes already anticipated in the first half of the 20th century.

Many believe vaccines are among the greatest achievements of modern medicine – in industrial nations, they have eliminated naturally occurring cases of smallpox, and nearly eliminated polio, while other diseases, such as typhus, rotavirus, hepatitis A and B and others are well controlled.

Many of the biggest percentage price moves in the Dow occurred early in its history, as the nascent industrial economy matured.

Many Southern politicians opposed these as improving Northern industrial interests at the expense of Southern interests.

: Many large factories and other industrial centres, such as chemical plants, oil refineries, breweries and distilleries have ambulance services provided by employers as a means of protecting their interests and the welfare of their staff.

Many industrial estates are located throughout the island.

Many industrial groups, including Einstürzende Neubauten, took inspiration from world music.

Many of the initial industrial musicians preferred to cite artists or thinkers, rather than musicians, as their inspiration.

Many blacks left the county and state to migrate to northern and midwestern industrial cities for work in the Great Migration.

Many grand houses in Brockley were occupied by the owners and managers of factories in neighbouring industrial areas such as Deptford and Bermondsey.