In mathematics, the word theory is used informally to refer to certain distinct bodies of knowledge about mathematics. This knowledge consists of axioms, definitions, theorems and computational techniques, all related in some way by tradition or practice. Examples include group theory, set theory, Lebesgue integration theory and field theory. The term "theory" also has a formal usage in mathematics, particularly in mathematical logic and model theory. A theory in this sense is a set of statements closed under certain rul ...

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Theory, Theory - Etymology, Theory - Science, Theory - Models, Theory - Types of theories, Theory - Further explanation of a scientific theory, Theory - Characteristics, Theory - Mathematics, Theory - Other fields, Theory - List of famous theories, Theory - Reference

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Theory, Theory - Etymology, Theory - Science, Theory - Models, Theory - Types of theories, Theory - Further explanation of a scientific theory, Theory - Characteristics, Theory - Mathematics, Theory - Other fields, Theory - List of famous theories, Theory - Reference

Read more here: » Theory: Encyclopedia II - Theory - Science

In scientific usage, a theory does not mean an unsubstantiated guess or hunch, as it often does in other contexts. Scientific theories are never proven to be true, but can be disproven. All scientific understanding takes the form of hypotheses, or conjectures. A theory is in this context a set of hypotheses that are logically bound together (See also hypothetico-deductive method). Theories are typically ways of explaining why things happen, often, but not always after their occurrence is no longer in scientific di ...

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Theory, Theory - Etymology, Theory - Science, Theory - Models, Theory - Types of theories, Theory - Further explanation of a scientific theory, Theory - Characteristics, Theory - Mathematics, Theory - Other fields, Theory - List of famous theories, Theory - Reference

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Theory has a number of distinct meanings in different fields of knowledge, depending on the context and their methodologies. Theory - Etymology. The word ‘theory’ derives from the Greek ‘theorein’, which means ‘to look at’. According to some sources, it was used frequently in terms of ‘looking at’ a theatre stage, which may explain why sometimes the word ‘theory’ is used as something provisional or not completely resembling real. The term ‘theoria’ (a noun) was already used by ...

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Theory - Etymology Theory - Science
Theory - Models Theory - Types of theories Theory - Further explanation of a scientific theory Theory - Characteristics
Theory - Mathematics Theory - Other fields Theory - List of famous theories Theory - Reference

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There is not yet a naming consensus. Below are listed several terms that have been used, past and present. One challenge in taxonomy is that some patterns of behavior are labeled by experts symptoms or sub-types of ADHD, while other experts label those same patterns as their own disorders, independent of ADHD. For the purposes of this article, the "Terminology" section will be used only to name ADHD and its near equivalents, while the names for its manifestations and subtypes will be listed in 'Symptoms', below. Attention-def ...

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Attention-deficit hyperactivity disorder, Attention-deficit hyperactivity disorder - Formal definitions, Attention-deficit hyperactivity disorder - Symptoms, Attention-deficit hyperactivity disorder - Diagnosis, Attention-deficit hyperactivity disorder - Comparative behavior, Attention-deficit hyperactivity disorder - Incidence, Attention-deficit hyperactivity disorder - Testing for ADHD, Attention-deficit hyperactivity disorder - Psychological testing, Attention-deficit hyperactivity disorder - Other forms of testing, Attention-deficit hyperactivity disorder - Possible causes, Attention-deficit hyperactivity disorder - Genetic vulnerabilities, Attention-deficit hyperactivity disorder - Neuro-chemical imbalance, Attention-deficit hyperactivity disorder - Smoking during pregnancy, Attention-deficit hyperactivity disorder - Nutrition, Attention-deficit hyperactivity disorder - Sleep apnea, Attention-deficit hyperactivity disorder - Head injuries, Attention-deficit hyperactivity disorder - Treatment, Attention-deficit hyperactivity disorder - Mainstream treatments, Attention-deficit hyperactivity disorder - Alternative treatments, Attention-deficit hyperactivity disorder - Views on neurodiversity, Attention-deficit hyperactivity disorder - Views on parenting, Attention-deficit hyperactivity disorder - Evidence for ADHD as an organic phenomenon, Attention-deficit hyperactivity disorder - Positive aspects, Attention-deficit hyperactivity disorder - Controversy, Attention-deficit hyperactivity disorder - Skepticism towards ADHD as a diagnosis, Attention-deficit hyperactivity disorder - ADHD as pseudo-science and its falsifiability, Attention-deficit hyperactivity disorder - Hunter in a Farmer's Society theory, Attention-deficit hyperactivity disorder - ADHD as a social construct, Attention-deficit hyperactivity disorder - Concerns about the impact of labeling, Attention-deficit hyperactivity disorder - Concerns about medication, Attention-deficit hyperactivity disorder - ADD/ADHD a hoax?, Attention-deficit hyperactivity disorder - Famous people and ADHD, Attention-deficit hyperactivity disorder - Twentieth century history, Attention-deficit hyperactivity disorder - Terminology, Attention-deficit hyperactivity disorder - Footnotes

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There is not yet a naming consensus. Below are listed several terms that have been used, past and present. One challenge in taxonomy is that some patterns of behavior are labeled by experts symptoms or sub-types of ADHD, while other experts label those same patterns as their own disorders, independent of ADHD. For the purposes of this article, the "Terminology" section will be used only to name ADHD and its near equivalents, while the names for its manifestations and subtypes will be listed in 'Symptoms', below. Attention-def ...

See also:

Attention-deficit hyperactivity disorder, Attention-deficit hyperactivity disorder - Formal definitions, Attention-deficit hyperactivity disorder - Symptoms, Attention-deficit hyperactivity disorder - Diagnosis, Attention-deficit hyperactivity disorder - Comparative behavior, Attention-deficit hyperactivity disorder - Incidence, Attention-deficit hyperactivity disorder - Testing for ADHD, Attention-deficit hyperactivity disorder - Psychological testing, Attention-deficit hyperactivity disorder - Other forms of testing, Attention-deficit hyperactivity disorder - Possible causes, Attention-deficit hyperactivity disorder - Genetic vulnerabilities, Attention-deficit hyperactivity disorder - Neuro-chemical imbalance, Attention-deficit hyperactivity disorder - Smoking during pregnancy, Attention-deficit hyperactivity disorder - Nutrition, Attention-deficit hyperactivity disorder - Sleep apnea, Attention-deficit hyperactivity disorder - Head injuries, Attention-deficit hyperactivity disorder - Treatment, Attention-deficit hyperactivity disorder - Mainstream treatments, Attention-deficit hyperactivity disorder - Alternative treatments, Attention-deficit hyperactivity disorder - Views on neurodiversity, Attention-deficit hyperactivity disorder - Views on parenting, Attention-deficit hyperactivity disorder - Evidence for ADHD as an organic phenomenon, Attention-deficit hyperactivity disorder - Positive aspects, Attention-deficit hyperactivity disorder - Controversy, Attention-deficit hyperactivity disorder - Skepticism towards ADHD as a diagnosis, Attention-deficit hyperactivity disorder - ADHD as pseudo-science and its falsifiability, Attention-deficit hyperactivity disorder - Hunter in a Farmer's Society theory, Attention-deficit hyperactivity disorder - ADHD as a social construct, Attention-deficit hyperactivity disorder - Concerns about the impact of labeling, Attention-deficit hyperactivity disorder - Concerns about medication, Attention-deficit hyperactivity disorder - ADD/ADHD a hoax?, Attention-deficit hyperactivity disorder - famous people and ADHD, Attention-deficit hyperactivity disorder - Twentieth century history, Attention-deficit hyperactivity disorder - Terminology, Attention-deficit hyperactivity disorder - Footnotes

Read more here: » Attention-deficit hyperactivity disorder: Encyclopedia II - Attention-deficit hyperactivity disorder - Terminology

Purposely left off this list is that most famous of all nurses, Florence Nightingale. Ms. Nightingale never actually formulated a theory of nursing science but was posthumously accredited with same by others who categorized her personal journaling and communications into a theoretical framework. Also left off are many who simply improvised on others work and acclaimed their thoughts as new theoretical vision. ...

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Nursing theory, Nursing theory - Universal features of nursing models, Nursing theory - History of nursing models, Nursing theory - Major nursing theorists, Nursing theory - Examples of nursing models, Nursing theory - Psychiatric nursing, Nursing theory - Children's nursing, Nursing theory - Adult nursing, Nursing theory - Community and rehabilitation nursing, Nursing theory - Generic model health social & pastoral care, Nursing theory - Examples of mini micro theories and student work, Nursing theory - Synergy model, Nursing theory - Future of nursing models

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Alopecia, commonly known as baldness, is a set of disorders which involves the state of lacking hair where it would normally grow, especially on the head. The most common form of baldness is a progressive hair-thinning condition that occurs in adult humans and other primate species. Nonetheless, the severity and nature of condition can vary greatly; it ranges from male and female pattern alopecia (alopecia androgenetica), to alopecia areata, which involves the loss of some of the hair from the head, alopecia totalis, which invo ...

Including:

Baldness - Mechanism of male pattern baldness Baldness - Evolutionary theories of male pattern baldness Baldness - Approaches to baldness
Baldness - Psychological implications Baldness - Preventing and reversing hair loss
Baldness - Concealing hair loss Baldness - Embracing baldness Baldness - Common baldness myths Baldness - Trivia Baldness - Reference

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People who are left-handed are more dexterous with their left hand than with their right hand: they will probably also use their left hand for tasks such as personal care, cooking, and so on. Writing is not as good an indicator of handedness as it might seem, because many people who are left-handed write with their right hand and use their left for everything else. Left-handed - Statistics of left-handedness. Approximately 10% of the population is left-handed. People who can use both hands equally well are ...

Including:

Left-handed - Statistics of left-handedness Left-handed - Causes of left-handedness
Left-handed - Evolutionary theories Left-handed - Biological theories Left-handed - Environmental theories
Left-handed - Social stigma and repression of left-handedness
Left-handed - Linguistic suggestion Left-handed - Daily suppression
Left-handed - Left-handedness and health Left-handed - Left-handedness and intelligence Left-handed - Disappearing Left-Handers Left-handed - Left-handedness and developmental disorders Left-handed - Left-handedness and sexual offences Left-handed - Left-sidedness
Left-handed - In humans Left-handed - In animals
Left-handed - Source

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Archaeology, archeology or archæology (from the Greek words αρχαίος = ancient and λόγος = word/speech/discourse) is the study of human cultures through the recovery, documentation and analysis of material remains and environmental data, including architecture, artifacts, biofacts, human remains, and landscapes. The goals of archaeology are to document and explain the origins and development of human culture, understand culture history, chronicle cultural evolution, and study human behavi ...

Including:

Archaeology - Usage note Archaeology - Ontology and definition Archaeology - Importance and applicability Archaeology - Goals
Archaeology - Academic sub-disciplines Archaeology - Cultural resources management
Archaeology - Field methods
Archaeology - Survey Archaeology - Excavation
Archaeology - Post-excavation analysis Archaeology - History of archaeology Archaeology - Archaeological theory Archaeology - Public archaeology
Archaeology - Pseudoarchaeology Archaeology - Looting Archaeology - Public outreach Archaeology - Descendant peoples

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By category Medieval 16th Century - 17th Century 18th Century -19th Century 20th Century - Contemporary Chronological list Writers by category Novelists - Playwrights Poets - Essayists Short Story Writers Charles-Louis de Secondat, Baron de La Brède et de Montesquieu (January 18, 1689 – February 10, 1755), more commonly known as Montesquieu, was a French political thinker who lived during the Enlightenment and is famous for his articulation of the theory of ...

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Charles de Secondat Baron de Montesquieu - Biography Charles de Secondat Baron de Montesquieu - Political views Charles de Secondat Baron de Montesquieu - List of Works

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During certain events and at particular times of year, hoaxes are perpetrated by many people and groups. The most famous of these is certainly April Fool's Day, which is open season for pranks and dubious announcements. A New Zealand tradition is the capping stunt, wherein university students perpetrate a hoax upon an unsuspecting population. The Acts are traditionally executed near graduation (the "capping"). Mexico and many Spanish-speaking countries have Innocent's Day, on December 28, to make "innocent" a person with jokes ...

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Hoax, Hoax - Historically important hoaxes, Hoax - Hoax traditions

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Blind musicians are singers or instrumentalists who are physically unable to see. In many cultures, blind people have become musicians in disproportionate numbers. Blind musicians - Why music is a popular profession among the blind. Several theories have been advanced as to why the profession of musician is a popular one for the blind. There has long been a folk belief that blind people hear better than sighted people, and that therefore the blind have an advantage when performing music. Some recent studies ...

Including:

Blind musicians - Why music is a popular profession among the blind Blind musicians - Resources for blind musicians Blind musicians - The image of the blind musician Blind musicians - Blind musicians in China Blind musicians - Biwa Hoshi in Japan Blind musicians - Bandurists and lirnyky in Ukraine
Blind musicians - External links
Blind musicians - Traditional Irish musicians Blind musicians - European piano tuners Blind musicians - American country blues Blind musicians - List of famous blind musicians

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He moved to Vienna with his family when he was two years old. He studied law at the University of Vienna, taking his doctorate in 1906. In 1911, he achieved his habilitation (license to hold university lectures) in public law and legal philosophy and published his first major work, Main Problems in the Theory of Public Law (Hauptprobleme der Staatsrechtslehre). In 1912, Kelsen married M ...

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Hans Kelsen, Hans Kelsen - Vienna: 1883-1930, Hans Kelsen - Cologne: 1930-1933, Hans Kelsen - Geneva: 1933-1940, Hans Kelsen - America: 1940-1973, Hans Kelsen - Legal theory

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Kelsen is considered one of the preeminent jurists of the 20th century. His legal theory, a very strict and scientifically understood type of legal positivism, is based on the idea of a Grundnorm, a hypothetical norm on which all subsequent levels of a legal system such as constitutional law and "simple" law are based. His theory has followers among scholars of public law world-wide. His disciples developed "schools" of thought to extend his theories, such as the Vienna School in Austria and the Brno School in Czechoslovakia. In the English-speaking world, H. L. A. Hart and Joseph Raz are perhaps the most well-known a ...

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Hans Kelsen, Hans Kelsen - Vienna: 1883-1930, Hans Kelsen - Cologne: 1930-1933, Hans Kelsen - Geneva: 1933-1940, Hans Kelsen - America: 1940-1973, Hans Kelsen - Legal theory

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Believed by mainstream egyptologists to have been constructed in approximately 20 years, the most widely accepted estimate for its date of completion is c. 2580 BC. This date is loosely supported by archæological findings which have yet to reveal a civilization (of sufficient population size or technical ability) older than the fourth dynasty in the area. The Great Pyramid is the oldest and largest of the three pyramids in the Giza Necropolis adjacent to the outskirts of modern Cairo, Egypt in Africa. It is the main part of a complex ...

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Great Pyramid of Giza, Great Pyramid of Giza - Age and location, Great Pyramid of Giza - Dating evidence, Great Pyramid of Giza - Construction and internal layout, Great Pyramid of Giza - Labor and construction theories, Great Pyramid of Giza - Alternative theories

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At construction, the Great Pyramid was 280 Egyptian Old Royal Cubits tall (146.5 metres or 481 feet), but due to erosion and the theft of its topmost stone (the so-called pyramidion) its current height is 455.21 ft, approximately 138.75 m. As has been proven by papyrus documents, each base side measured in antiquity 440 (20.63 inch) royal cubits. Thus, the Great Pyramid base was originally 231 m on a side and covered approximately 53,000 square metres with an angle of 51.7 degrees—close to the idea for a stable pyramidal structur ...

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Great Pyramid of Giza, Great Pyramid of Giza - Age and location, Great Pyramid of Giza - Dating evidence, Great Pyramid of Giza - Construction and internal layout, Great Pyramid of Giza - Labor and construction theories, Great Pyramid of Giza - Alternative theories

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Many varied estimates have been made regarding the labor force needed to construct the Great Pyramid. Herodotus, the Greek historian in the 5th century BC, estimated that construction may have required the labor of 100,000 workers for 20 years. Recent evidence has been found that suggests the workforce was in fact paid, which would require accounting and bureaucratic skills of a high order. Polish architect Wieslaw Kozinski believed that it took as many as 25 men to transport a 1.5-ton stone block; based on this, he estimated the workforce t ...

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Great Pyramid of Giza, Great Pyramid of Giza - Age and location, Great Pyramid of Giza - Dating evidence, Great Pyramid of Giza - Construction and internal layout, Great Pyramid of Giza - Labor and construction theories, Great Pyramid of Giza - Alternative theories

Read more here: » Great Pyramid of Giza: Encyclopedia II - Great Pyramid of Giza - Labor and construction theories

In common with many other monumental structures from antiquity, the Great Pyramid has over time been the subject of a great number of speculative or alternative publications, which put forward a variety of explanations about its origins, dating, construction and purpose. In support of their claims such accounts either rely upon novel reinterpretations of the available data from fields such as archaeology, history and astronomy, or appeal to [[mythology|mythological], mystical, numerological, astrological and othe ...

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Great Pyramid of Giza, Great Pyramid of Giza - Age and location, Great Pyramid of Giza - Dating evidence, Great Pyramid of Giza - Construction and internal layout, Great Pyramid of Giza - Labor and construction theories, Great Pyramid of Giza - Alternative theories

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While the precise mechanism which underlies androgenic alopecia is unknown, a high level of dihydrotestosterone (DHT) is crucial in initiating the process. DHT is, ironically, a hair growth stimulator. Testosterone is synthesized from pregnalone which is formed from cholesterol. DHT is formed from Testosterone with the conversion from testosterone to DHT being mediated by 5-alpha reductase. There are two subtypes of 5-alpha re ...

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Baldness, Baldness - Mechanism of male pattern baldness, Baldness - Evolutionary theories of male pattern baldness, Baldness - Approaches to baldness, Baldness - Psychological implications, Baldness - Preventing and reversing hair loss, Baldness - Concealing hair loss, Baldness - Embracing baldness, Baldness - Common baldness myths, Baldness - Trivia, Baldness - Reference

Read more here: » Baldness: Encyclopedia II - Baldness - Mechanism of male pattern baldness