In mathematics, a factor system (sometimes called factor set) is a fundamental tool of Otto Schreier’s classical theory for group extension problem.[1][2] It consists of a set of automorphisms and a binary function on a group satisfying certain condition (so-called cocycle condition). In fact, a factor system constitutes a realisation of the cocycles in the second cohomology group in group cohomology.[3]
^group extension at the nLab
^Saunders MacLane, Homology, p. 103, at Google Books
In mathematics, a factorsystem (sometimes called factor set) is a fundamental tool of Otto Schreier’s classical theory for group extension problem. It...
misnomer, the term survives (e.g., rhesus blood group system and the obsolete terms rhesus factor, rhesus positive, and rhesus negative – all three of...
also uses the Elo system. Despite questions of the appropriateness of using the Elo system to rate games in which luck is a factor, trading-card game...
In electrical engineering, the power factor of an AC power system is defined as the ratio of the real power absorbed by the load to the apparent power...
Look up Factor or factor in Wiktionary, the free dictionary. Factor, a Latin word meaning "who/which acts", may refer to: Factor (agent), a person who...
In physics and engineering, the quality factor or Q factor is a dimensionless parameter that describes how underdamped an oscillator or resonator is. It...
platelets, and the exposure of subendothelial platelet tissue factor to coagulation factor VII, which ultimately leads to cross-linked fibrin formation...
Colour Factorsystem, consisting of rods from lengths 1 to 12 cm. Based on the work of Cuisenaire and Gattegno, he had invented a unified system for logically...
The Behavioral Risk Factor Surveillance System (BRFSS) is a United States health survey that looks at behavioral risk factors. Begun in 1984, the BRFSS...
limiting factor is a variable of a system that causes a noticeable change in output or another measure of a type of system. The limiting factor is in a...
The Human Factors Analysis and Classification System (HFACS) identifies the human causes of an accident and offers tools for analysis as a way to plan...
dissipation factor (DF) is a measure of loss-rate of energy of a mode of oscillation (mechanical, electrical, or electromechanical) in a dissipative system. It...
engineering, a factor of safety (FoS), also known as (and used interchangeably with) safety factor (SF), expresses how much stronger a system is than it needs...
Coagulation factor VIII (Factor VIII, FVIII, also known as anti-hemophilic factor (AHF)) is an essential blood clotting protein. In humans, it is encoded...
describing it as "The whole system, ... including not only the organism-complex, but also the whole complex of physical factors forming what we call the...
intelligence (AI), an expert system is a computer system emulating the decision-making ability of a human expert. Expert systems are designed to solve complex...
In an audio system, the damping factor is defined as the ratio of the rated impedance of the loudspeaker (usually assumed to be 8 Ω) to the source impedance...
In computing, the motherboard form factor is the specification of a motherboard – the dimensions, power supply type, location of mounting holes, number...
needed] In the alternative pathway, C3b binds to Factor B. Factor D releases Factor Ba from Factor B bound to C3b. The complex of C3b(2)Bb is a protease...
chromatography, the retardation factor (R) is the fraction of an analyte in the mobile phase of a chromatographic system. In planar chromatography in particular...
The impact factor (IF) or journal impact factor (JIF) of an academic journal is a scientometric index calculated by Clarivate that reflects the yearly...
Factor analysis is a statistical method used to describe variability among observed, correlated variables in terms of a potentially lower number of unobserved...
high crest factor. Many crest factor reduction techniques (CFR) have been proposed for OFDM. The reduction in crest factor results in a system that can...
nervous system and peripheral nervous system, and they are capable of regrowing damaged neurons in test tubes and animal models. Some neurotrophic factors are...