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What (who) is spectral redundance - definition

COLOR EVOKED BY A SINGLE WAVELENGTH OF LIGHT IN THE VISIBLE SPECTRUM

Spectral colour; Spectral colors; Monochrome radiation; Spectral locus; Spectral Locus; Non-spectral color; Extra-spectral color

Spectral color

A spectral color is a color that is evoked in a typical human by a single wavelength of light in the visible spectrum, or by a relatively narrow band of wavelengths, also known as monochromatic light. Every wavelength of visible light is perceived as a spectral color, in a continuous spectrum; the colors of sufficiently close wavelengths are indistinguishable for the human eye.

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

Serre spectral sequence

SPECTRAL SEQUENCE RELATING THE SINGULAR COHOMOLOGY OF THE TOTAL SPACE OF A SERRE FIBRATION IN TERMS OF THE COHOMOLOGIES OF THE BASE SPACE AND THE FIBER

Leray-Serre spectral sequence; Leray–Serre spectral sequence; Spectral sequence for the covering

In mathematics, the Serre spectral sequence (sometimes Leray–Serre spectral sequence to acknowledge earlier work of Jean Leray in the Leray spectral sequence) is an important tool in algebraic topology. It expresses, in the language of homological algebra, the singular (co)homology of the total space X of a (Serre) fibration in terms of the (co)homology of the base space B and the fiber F.

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

Spectral edge frequency

RELATIVE IMPORTANCE OF CERTAIN FREQUENCIES IN A COMPOSITE SIGNAL

Signal frequency spectrum; Power spectrum; Spectral envelope; Power spectral density; Power-spectral density function; Spectral power density; Signal spectrum; Spectral edge frequency; Acceleration spectral density; W/Hz; DBm/Hz; Energy spectral density; Spectral density function; Spectral phase; Phase spectrum; Spectral distribution function; Spectral function; Cross-spectral density; Frequency spectrum; Spectral density (signal processing); Spectral energy density; Fluctuation spectrum; Fluctuation spectra; Amplitude spectral density; Amplitude spectrum; Cross power spectral density; Power spectra; Phase spectral density; Cross-power spectrum

The spectral edge frequency or SEF is a measure used in signal processing. It is usually expressed as "SEF x", which stands for the frequency below which x percent of the total power of a given signal are located.

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

Wikipedia

Spectral color

A spectral color is a color that is evoked by monochromatic light, i.e. either a single wavelength of light in the visible spectrum, or a relatively narrow band of wavelengths (e.g. lasers). Every wavelength of visible light is perceived as a spectral color; when viewed as a continuous spectrum, these colors are seen as the familiar rainbow.

All colors that do not qualify as a spectral color are called non-spectral colors or extra-spectral colors. Extra-spectral colors cannot be evoked with a single wavelength of light, but rather by a combination of wavelengths. Likewise, light comprising several wavelengths cannot evoke a spectral color.

https://en.wikipedia.org/wiki/Spectral color