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Eiga.com
Eiga.com, also known as 映画.com, is Japan's leading movie information website, launched in August 1998 and fully acquired by the entertainment company GENDA in 2025.
Eigen (C++ library)
Eigen is a header-only C++ template library for linear algebra, started in 2006, providing matrix and vector classes, numerical solvers, and decompositions under the MPL2 license.
Eigendecomposition of a matrix
Eigendecomposition, or eigenvalue decomposition, is the factorization of a square matrix as A = XΛX⁻¹ with eigenvectors; it exists when the matrix has an eigenbasis and underlies PCA and quantum mechanics.
Eigenface
An eigenface is an eigenvector reshaped into a face-like image, produced by principal component analysis of face photographs; the method was introduced for face recognition by Turk and Pentland at MIT in 1991.
Eigenfunction
An eigenfunction is a nonzero function that a linear operator reproduces as a scalar multiple of itself, the function-space analog of an eigenvector of a matrix.
Eigengrau
Eigengrau (Eigenlicht, dark light, brain gray) is the intrinsic dark gray seen in total darkness, a term credited to Gustav Fechner, caused by spontaneous retinal dark noise from visual pigment and phototransduction fluctuations.
Eigenstate thermalization hypothesis
The eigenstate thermalization hypothesis (ETH) is a quantum statistical mechanics conjecture that individual eigenstates of nonintegrable systems are locally thermal, explaining how closed quantum systems equilibrate.
Eigensystem realization algorithm
The eigensystem realization algorithm (ERA) is a time-domain system identification method developed at NASA's Langley Research Center in 1985 that builds minimum-order state-space models and extracts modal parameters from impulse response data.
Eigenvalue
An eigenvalue is a scalar satisfying Az = λz for a nonzero eigenvector z of a matrix A, meaning the transformation stretches that vector without rotating it.
Eigenvalue algorithm
An eigenvalue algorithm is a numerical method for computing eigenvalues of a matrix, using dense methods like the QR algorithm or iterative methods for large sparse matrices.
Eigenvalue interlacing
Eigenvalue interlacing is a linear algebra theorem stating that the eigenvalues of a Hermitian matrix and those of any principal submatrix must alternate in a fixed order.
Eigenvalue-based spectrum sensing
Eigenvalue-based spectrum sensing is a blind detection method in cognitive radio that detects primary users using covariance matrix eigenvalues, without knowing the signal or noise power.
Eigenvalues and eigenvectors
Eigenvalues and eigenvectors, also called characteristic roots, are scalars and nonzero vectors of a square matrix or operator satisfying Ax = λx, so the matrix only stretches the vector's length.
Eigenvector centrality
Eigenvector centrality is a network measure in which each node's score depends on the scores of the nodes pointing to it, first applied by Edmund Landau in 1895.
Eiger
The Eiger, or Mount Eiger, is a 3,967-meter mountain in the Bernese Alps of Switzerland, known for its roughly 1,800-meter north face, first climbed in 1938.
EIGER2 X detector
The EIGER2 X detector is a family of large-area hybrid-photon-counting X-ray detectors made by DECTRIS of Baden, Switzerland, for synchrotron beamlines at fourth-generation sources, launched at the 2017 IUCr Congress in Hyderabad.
Eight (Shinedown album)
EI8HT (Eight) is Shinedown's eighth studio album, released May 29, 2026 on Atlantic Records: 18 tracks, 1 hour 4 minutes, produced by Eric Bass, mixing hard rock, ballads, and the band's first country song, "Searchlight."
Eight Anthologies
The Eight Anthologies, or Ettuthokai, are a set of eight classical Tamil poetry anthologies that form the core of Sangam literature, dated roughly 300 BCE to 300 CE.
Eight Armies of Chengzhou
The Eight Armies of Chengzhou (成周八师) was the royal garrison army the Western Zhou dynasty stationed at its eastern capital Chengzhou, near present-day Luoyang, to hold the former Shang heartland.
Eight Armies of Yin
The Eight Armies of Yin (殷八师) was one of two standing armies of the Western Zhou dynasty, stationed in the east and known from bronze inscriptions.
Eight Banners (八旗)
Eight Banners (八旗): hereditary Manchu military-social organization founded by Nurhaci (1601–1615), later expanded with Mongol and Han banners; core Qing elite force, declined by 1800, abolished after the 1911 revolution.
Eight Below
Eight Below is a 2006 Disney survival adventure film directed by Frank Marshall, starring Paul Walker, inspired by the 1983 Japanese film Nankyoku Monogatari and a 1957 Antarctic expedition; sled dogs left behind survive 152 days; $81.6M US gross.
Eight Commandants
The Eight Commandants (八校尉) were eight colonels of the Han dynasty, created at the start of Emperor Wu's reign, each ranked at 2000 shi and answering directly to the emperor.
Eight Crazy Nights
Eight Crazy Nights (Adam Sandler's Eight Crazy Nights) is a 2002 animated Hanukkah musical comedy from Columbia Pictures, directed by Seth Kearsley, with Sandler voicing Davey, Whitey, and Eleanore; a critical and box-office flop that became a cult holiday film.
Eight Deer Jaguar Claw
Eight Deer Jaguar Claw (Ocho Venado Garra de Jaguar) was a Mixtec ruler who founded the kingdom of Tututepec on the coast of Oaxaca and was killed in 1115.
Eight dimensions of quality
The eight dimensions of quality is a framework proposed by David A. Garvin in 1987 covering performance, features, reliability, conformance, durability, serviceability, aesthetics, and perceived quality.
Eight Divisions of the Zhongwu Army
The Eight Divisions of the Zhongwu Army (忠武八都) were Tang dynasty army divisions under Yang Fuguang against Huang Chao, dispersing at his death in the 880s.
Eight Elvises
Eight Elvises is a 1963 Andy Warhol silkscreen painting repeating eight images of Elvis Presley on a silver canvas, unique and sold for $100 million in 2008.
Eight Friends of Jingling
The Eight Friends of Jingling (竟陵八友) were eight literati gathered at the Western Lodge of Prince Xiao Ziliang during the Southern Qi dynasty's Yongming era.
Eight Friends of Zhushan
The Eight Friends of Zhushan (珠山八友) were a group of porcelain painters in Jingdezhen, China, who formed a society in 1928 and created the new famille rose style.