An Etymological Dictionary of Astronomy and Astrophysics
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فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 11 Search : variance
autocovariance
  خود-هم‌ورتایی   
xod-hamvartâyi

Fr.: autocovariance   

The → covariance of a → time series overt time.

auto-; → covariance.

autocovariance function
  کریای ِ خود-هم‌ورتایی   
karyâ-ye xod-hamvartâyi

Fr.: fonction d'autocovariance   

The autocovariance function (ACF) is defined as the sequence of covariances of a stationary process.
A mathematical function that expresses the autocovariance of a series in terms of the interval of separation.

autocovariance; → function.

charge invariance
  ناورتایی ِ بار   
nâvartâyi-ye bâr

Fr.: invariance de charge   

The → electric charge carried by an object is independent of the → velocity of the object with respect to the → observer. In other words, the charge is the same in any → frame of reference.

charge; → invariance.

covariance
  هم‌ورتایی   
hamvartâyi

Fr.: covariance   

In statistics, a measure of linear dependence. For two random variables X and Y with expectations mx and my, the covariance is E{(X - mx)(Y - my)}.

From co-, → com-, + → variance.

From ham-, → com-, + vartâyi, → variance.

gauge invariance
  ناورتایی ِ گز   
nâvartâyi-ye gaz

Fr.: invariance de jauge   

The invariance of any field theory under gauge transformation.

gauge; → invariance.

invariance
  ناورتایی   
nâvartâyi

Fr.: invariance   

Any property of a physical law or quantity that is unchanged after the application of certain classes of transformations.

Invariance; noun of → invariant.

local Lorentz invariance
  ناورتایی ِ لورنتز ِ محلی   
nâvartâyi-ye Lorentz-e mahali

Fr.: invariance de Lorentz locale   

Einstein equivalence principle.

local; → Lorentz; → invariance.

local position invariance
  ناورتایی ِ نهش ِ محلی   
nâvartâyi-ye neheš-e mahali

Fr.: invariance de position locale   

Einstein equivalence principle.

local; → position; → invariance.

Lorentz invariance
  ناورتایی ِ لورنتز   
nâvartâyi-ye Lorentz

Fr.: invariance de Lorentz   

Of a physical law, invariance with respect to a → Lorentz transformation.

Lorentz; → invariance.

principle of covariance
  پَروز ِ هم‌ورتایی   
parvaz-e hamvartâyi

Fr.: principe de covariance   

In special relativity, the principle that the laws of physics take the same mathematical form in all inertial frames of reference.

principle; → covariance.

variance
  ورتایی   
vartâyi

Fr.: variance   

A measure of the scatter of the values of a random variable (X) about its mean (μ). Var(X) = E(X -μ)2. The positive square root of the variance is called the → standard deviation.

M.E., from O.Fr. variance, from L. variantia, from variare "to change," → vary.

Vartâyi quality noun from vartâ agent noun from vartidan, → vary.