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What (who) is photometric equivalent - definition

Equivalent matrices; Equivalent matrix

Equivalent weight

IN CHEMISTRY

Equivalent Weight; Equivalent mass; Gram equivalent; Gram-equivalent weight; Equivalent weight (chemistry)

In chemistry, equivalent weight (also known as gram equivalentgram equivalent Merriam-Webster Dictionary) is the mass of one equivalent, that is the mass of a given substance which will combine with or displace a fixed quantity of another substance. The equivalent weight of an element is the mass which combines with or displaces 1.

https://en.wikipedia.org/wiki/Equivalent_weight

Strömgren photometric system

MEDIUM-BAND PHOTOMETRIC SYSTEM

Stromgren photometric system; Strömgren photometry; Strömgren-Crawford photometry; Strömgren-Crawford photometric system; Stromgren-Crawford photometry; Stroemgren photometric system; Stromgren-Crawford photometric system; Stroemgren photometry; Stroemgren-Crawford photometry; Stroemgren-Crawford photometric system; Stromgren photometry; Four-colour photometry; Uvby; Uvby system

The Strömgren photometric system, abbreviated also as uvbyβ or simply uvby, and sometimes referred as Strömgren - Crawford photometric system, is a four-colour medium-passband photometric system plus Hβ (H-beta) filters for determining magnitudes and obtaining spectral classification of stars. Its use was pioneered by the Danish astronomer Bengt Strömgren in 1956 and was extended by his colleague the American astronomer David L.

https://en.wikipedia.org/wiki/Strömgren_photometric_system

Equivalent (chemistry)

UNIT OF MEASUREMENT

Milliequivalent; Meq; Meq/L; Meq/l; Molar equivalent; MEq; Milliequivalents; MEq/L; Gram-equivalent

An equivalent (symbol: officially equiv; unofficially but often Eq) is the amount of a substance that reacts with (or is equivalent to) an arbitrary amount (typically one mole) of another substance in a given chemical reaction. It is an archaic unit of measurement that was used in chemistry and the biological sciences (see ).

https://en.wikipedia.org/wiki/Equivalent_(chemistry)

Wikipedia

Matrix equivalence

In linear algebra, two rectangular m-by-n matrices A and B are called equivalent if

B=Q^{-1}AP

for some invertible n-by-n matrix P and some invertible m-by-m matrix Q. Equivalent matrices represent the same linear transformation V → W under two different choices of a pair of bases of V and W, with P and Q being the change of basis matrices in V and W respectively.

The notion of equivalence should not be confused with that of similarity, which is only defined for square matrices, and is much more restrictive (similar matrices are certainly equivalent, but equivalent square matrices need not be similar). That notion corresponds to matrices representing the same endomorphism V → V under two different choices of a single basis of V, used both for initial vectors and their images.

https://en.wikipedia.org/wiki/Matrix equivalence