least kucektarin, kamtarin Fr.: moindre, plus petit Smallest in size, amount, degree, etc. From M.E. leest(e), O.E. læst, læsest "smallest" (superlative of læs "smaller, less"). Kucaktarin, kamtarin, superlatives of kucak and
kam, → small. |
least common multiplier (LCM) kucektarin bastâgar-e hamdâr Fr.: plus petit commun multiple Of two or more → integers, the smallest positive number that is divisible by those integers without a remainder. → least; → common; → multiplier. |
least squares kucaktarin cârušhâ Fr.: moindres carrés Any statistical procedure that involves minimizing the sum of squared differences. |
least-squares deconvolution (LSD) vâhamâgiš-e kucaktarin cârušhâ Fr.: déconvolution des moindres carrés A → cross correlation technique for computing average profiles from thousands of → spectral lines simultaneously. The technique, first introduced by Donati et al. (1997, MNRAS 291,658), is based on several assumptions: additive → line profiles, wavelength independent → limb darkening, self-similar local profile shape, and weak → magnetic fields. Thus, unpolarized/polarized stellar spectra can indeed be seen as a line pattern → convolved with an average line profile. In this context, extracting this average line profile amounts to a linear → deconvolution problem. The method treats it as a matrix problem and look for the → least squares solution. In practice, LSD is very similar to most other cross-correlation techniques, though slightly more sophisticated in the sense that it cleans the cross-correlation profile from the autocorrelation profile of the line pattern. The technique is used to investigate the physical processes that take place in stellar atmospheres and that affect all spectral line profiles in a similar way. This includes the study of line profile variations (LPV) caused by orbital motion of the star and/or stellar surface inhomogeneities, for example. However, its widest application nowadays is the detection of weak magnetic fields in stars over the entire → H-R diagram based on → Stokes parameter V (→ circular polarization) observations (see also Tkachenko et al., 2013, A&A 560, A37 and references therein). → least; → square; → deconvolution. |
least-squares fit saz-e kucaktarin cârušhâ Fr.: ajustement moindres carrées A fit through data points using least squares. → least squares; → fit. |
method of least squares raveš-e kamtarin cârušhâ Fr.: méthode des moindres carrés A method of fitting a curve to data points so as to minimize the sum of the squares of the distances of the points from the curve. → method; → least squares. |
principle of least action parvaz-e kamtarin žireš, ~ ~ koneš Fr.: principe de moindre action The principle that, for a system whose total mechanical energy is conserved, the path to be taken for the system from one configuration to another is the one whose action has the least value relative to all other possible paths and from the same configurations. Also called Maupertuis' principle, least-action principle. |