Rho (disambiguation)
Encyclopedia
Symbols
in mathematics- Spectral radiusSpectral radiusIn mathematics, the spectral radius of a square matrix or a bounded linear operator is the supremum among the absolute values of the elements in its spectrum, which is sometimes denoted by ρ.-Matrices:...
in a spherical coordinate system
in physics
- DensityDensityThe mass density or density of a material is defined as its mass per unit volume. The symbol most often used for density is ρ . In some cases , density is also defined as its weight per unit volume; although, this quantity is more properly called specific weight...
of a material - Volume charge densityCharge densityThe linear, surface, or volume charge density is the amount of electric charge in a line, surface, or volume, respectively. It is measured in coulombs per meter , square meter , or cubic meter , respectively, and represented by the lowercase Greek letter Rho . Since there are positive as well as...
- ResistivityResistivityElectrical resistivity is a measure of how strongly a material opposes the flow of electric current. A low resistivity indicates a material that readily allows the movement of electric charge. The SI unit of electrical resistivity is the ohm metre...
of a material - Rho mesonRho mesonIn particle physics, a rho meson is a short-lived hadronic particle that is an isospin triplet whose three states are denoted as , and . After the pions and kaons, the rho mesons are the lightest strongly interacting particle with a mass of roughly for all three states...
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in chemistry
- The reaction constant in the Hammett equationHammett equationThe Hammett equation in organic chemistry describes a linear free-energy relationship relating reaction rates and equilibrium constants for many reactions involving benzoic acid derivatives with meta- and para-substituents to each other with just two parameters: a substituent constant and a...
in biology
- Rho factorRho factorA ρ factor is a prokaryotic protein involved in the termination of transcription.Rho factor is an essential transcription protein in prokaryotes. In Escherichia coli, it is a ~275 kD hexamer of identical subunits. Each subunit has an RNA-binding domain and an ATP-hydrolysis domain...
protein in RNA transcription termination - Rho family of GTPasesRho family of GTPasesThe Rho family of GTPases is a family of small signaling G protein , and is a subfamily of the Ras superfamily. The members of the Rho GTPase family have been shown to regulate many aspects of intracellular actin dynamics, and are found in all eukaryotic organisms including yeasts and some plants...
, small GTPase enzymes important in migration and stress fibre formation - Subjective night, the inactivity period of a Circadian rhythmCircadian rhythmA circadian rhythm, popularly referred to as body clock, is an endogenously driven , roughly 24-hour cycle in biochemical, physiological, or behavioural processes. Circadian rhythms have been widely observed in plants, animals, fungi and cyanobacteria...
- EcologyEcologyEcology is the scientific study of the relations that living organisms have with respect to each other and their natural environment. Variables of interest to ecologists include the composition, distribution, amount , number, and changing states of organisms within and among ecosystems...
, population damping ratio where ρ = λ1 / |λ2|.
in economics
- Rho (finance), in Quantitative Finance, a first order derivative of an option pricing formula versus the rate of a risk-free investment.
in statistics
- Spearman's rank correlation coefficientSpearman's rank correlation coefficientIn statistics, Spearman's rank correlation coefficient or Spearman's rho, named after Charles Spearman and often denoted by the Greek letter \rho or as r_s, is a non-parametric measure of statistical dependence between two variables. It assesses how well the relationship between two variables can...
, a non-parametric measure of correlation - Pearson product-moment correlation coefficientPearson product-moment correlation coefficientIn statistics, the Pearson product-moment correlation coefficient is a measure of the correlation between two variables X and Y, giving a value between +1 and −1 inclusive...
, a common measure of the correlation between two variables
Places
- Rho (Italy)Rho (Italy)Rho is a town and comune near Milan, Italy in the region of Lombardy, and has about 51,000 inhabitants.-History:Rho is first mentioned in a written document from 846 AD, referred to as simply a bunch of houses under the name of Vicus Raudus. According to a theory, the name derives from the Campi...
, a town near Milan, Italy (not to be confused with Ro, Italy) - Rho Island, a small Greek island near Kastellorizo
- Rho River, a tributary of the Dora di BardonecchiaDora di BardonecchiaThe Dora di Bardonecchia is a short tributary of the Dora Riparia river, lying entirely within the upper Susa Valley. It originates just outside Bardonecchia from the confluence of mountain streams from the valleys of Rochemolles, Frejus, Rho, and Valle Stretta...
- Rhodes International Airport, "Diagoras", a Greek airport whose IATA code is RHO
Other
- Giacomo RhoGiacomo RhoGiacomo Rho was an Italian Jesuit missionary in China.-Life:The son of a jurist, Rho entered the Society of Jesus at the age of twenty. While later proficient in mathematics, he was a poor student initially....
, Italian Jesuit missionary - Right-Hand Opponent (RHO), in Contract Bridge
- Rho CassiopeiaeRho CassiopeiaeRho Cassiopeiae is a yellow hypergiant star in the constellation Cassiopeia. It is about away from Earth, yet can still be seen by the naked eye , as it is 550,000 times as luminous as the Sun. On average, it has an absolute magnitude of −7.5, making it one of the most luminous stars known...
, a yellow hypergiant in the constellation Cassiopeia - Red Hot OrganizationRed Hot OrganizationRed Hot Organization is a not-for-profit, 501 3, international organization dedicated to fighting AIDS through pop culture.Since its inception in 1989, over 400 artists, producers and directors have contributed to over 15 compilation albums, related television programs and media events to raise...
, a charity organization dedicated to raising awareness of HIV/AIDS - Pollard's rho algorithmPollard's rho algorithmPollard's rho algorithm is a special-purpose integer factorization algorithm. It was invented by John Pollard in 1975. It is particularly effective at splitting composite numbers with small factors.-Core ideas:...
, an integer factorization algorithm, effective for finding small factors - Pollard's rho algorithm for logarithmsPollard's rho algorithm for logarithmsPollard's rho algorithm for logarithms is an algorithm for solving the discrete logarithm problem analogous to Pollard's rho algorithm for solving the Integer factorization problem....
, an algorithm for solving the discrete logarithm problem