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Ernst Zermelo
Ernst Zermelo (1871–1953) was a German mathematician, founder of axiomatic set theory, who first formulated the axiom of choice in 1904 and axiomatized set theory in 1908.
Ero Copper Corp.
Ero Copper Corp. is a Canadian mining company, founded in 2016 and headquartered in Vancouver, that operates copper and gold mines in Bahia, Pará, and Mato Grosso, Brazil.
Erosion
Erosion is the removal of soil, rock, or dissolved material by surface processes such as flowing water, wind, and ice, which transport it elsewhere for deposition.
Erosion control
Erosion control is the practice of preventing or reducing the wearing away of land by water, wind, and related processes, applied on farmland, construction sites, forests, and streambanks.
Erosion of the N=28 shell closure
The erosion of the N=28 shell closure is the progressive weakening of the magic neutron number N=28 in neutron-rich nuclei, collapsing to a deformed ground state in 42Si.
Erosion susceptibility mapping
Erosion susceptibility mapping is a geospatial modeling method that combines environmental factor layers with machine learning classifiers to classify land into erosion-proneness categories, supporting land-use planning and soil conservation.
eROSITA
eROSITA (extended ROentgen Survey with an Imaging Telescope Array) is a German-built X-ray telescope on the Russian-German SRG mission, launched in 2019 to scan the whole sky.
eROSITA all-sky survey
The eROSITA all-sky survey (eRASS) is the X-ray survey of the entire sky carried out by the eROSITA telescope aboard the Russian-German SRG observatory, beginning in December 2019.
eROSITA bubbles
The eROSITA bubbles are two huge lobes of hot, X-ray-emitting gas extending about 14 kiloparsecs above and below the Galactic Centre, discovered in 2020 by the eROSITA telescope.
Error
Error is the difference between a measured or computed value and the value that would be obtained under ideal conditions, as distinct from a mistake.
Error exponent (hypothesis testing)
An error exponent in hypothesis testing is the constant E governing how fast a test's error probability decays exponentially, roughly as 2 to the power -nE, with sample size n.
Error field
An error field is a small, unintended non-axisymmetric perturbation of the tokamak magnetic field, typically one part in 10,000, that can drive locked modes and plasma disruptions.
Error function
The error function, also called the Gauss error function, is a special function defined by an integral of e^{-t^2}; it is closely related to the normal distribution.
Error mitigation in variational quantum algorithms
Error mitigation in variational quantum algorithms is the set of classical post-processing techniques, such as zero-noise extrapolation and probabilistic error cancellation, that reduce hardware-noise bias in hybrid quantum-classical computations.
Error statistics
Error statistics is a philosophy of statistical inference developed principally by philosopher Deborah G. Mayo, in which methods are judged by their probabilities of committing erroneous interpretations of data.
Error-state Kalman filter
The error-state Kalman filter (ESKF), or indirect Kalman filter, is a state-estimation algorithm whose Kalman filter estimates errors between the true state and a nominal state.
Error-transparent gates
Error-transparent gates are quantum logic gates designed so any error occurring during the gate has the same effect as one occurring just before or after it, keeping it correctable.
Error–disturbance uncertainty relations
Error–disturbance uncertainty relations bound the error of measuring one quantum observable and the disturbance to another, replacing Heisenberg's 1927 product with Ozawa's universally valid 2003 relation, tested in 2012 experiments.
Errors and residuals
In statistics, an error is the difference between an observed value and the unknown true model value, while a residual is measured from a fitted model.
Errors-in-variables models
Errors-in-variables models are regression models that account for measurement error in predictor variables, correcting the biased, attenuated estimates ordinary least squares produces when covariates are observed with noise.
Ersa
Ersa (Jupiter LXXI, S/2018 J1) is a tiny outer prograde moon of Jupiter discovered by Scott S. Sheppard, announced 2018, named 2019 for the Greek goddess of dew, daughter of Zeus and Selene, sister of Pandia, radius about 1.5 km.
ERSST
ERSST (Extended Reconstructed Sea Surface Temperature) is a NOAA global monthly sea surface temperature analysis, built from ship, buoy, and Argo float observations, with a record back to 1850.
Ertapenem
Ertapenem, sold as Invanz, is a long-acting carbapenem antibiotic developed by Merck and first FDA-approved in 2001, given as a 1 g dose once daily, known for strong activity against ESBL-producing Enterobacterales but not Pseudomonas.
Erucic acid
Erucic acid is a 22-carbon monounsaturated fatty acid abundant in rapeseed and mustard oils, used industrially but subject to food limits for heart effects in animals.
Eruption column
An eruption column is the vertical or near-vertical mixture of pyroclasts, volcanic gas, and entrained air rising from an explosive volcanic vent, from a few hundred meters into the stratosphere.
Eruption of Mount Vesuvius in 79 AD
The eruption of Mount Vesuvius in 79 AD was a Plinian eruption that destroyed the Roman cities of Pompeii and Herculaneum near the Bay of Naples.
Ervin Kováts
Ervin Kováts (1927–2012) was a Hungarian-born chemist who proposed the Kováts retention index in 1958, the reference scale used in gas chromatography to identify volatile compounds.
Erwin Finlay-Freundlich
Erwin Finlay-Freundlich, also known as Erwin Freundlich, was a German-born astronomer who organized eclipse expeditions to measure the bending of starlight and built the Einstein Tower in Potsdam.
Erwin Frey
Erwin Frey, born 1960, is a German theoretical physicist at LMU Munich who studies nonequilibrium statistical physics and received the Max Planck Medal in 2023.
Erwin Hahn
Erwin Hahn (1921–2016) was an American physicist at the University of California, Berkeley, whose 1950 discovery of the spin echo in nuclear magnetic resonance underlies medical MRI.