50s–40s BC) used spectrum as a translation of the Greek philosophical term εἴδωλον ( eídōlon, “ image ” ). The only attestation in Classical antiquity is in a pair of letters between Cicero and Cassius Longinus which imply that the Epicurean Catius (fl. Spectrum n ( plural spectrums or spectra, diminutive spectrumpje n)įrom spec(iō) ( “ look at, behold ” ) + -trum (making it a doublet of speculum). Portuguese: espectro (pt) m ( Brazil, Portugal ), espetro m ( Portugal )Ĭyrillic: спектар m Roman: spektar (sh) mįrom Latin spectrum ( “ appearance, image, apparition ” ), from speciō ( “ look at, view ” ).Japanese: スペクトル (ja) ( supekutoru ), 分光 (ja) ( ぶんこう, bunkō )īokmål: spektrum n, spekter n Nynorsk: spektrum n, spekter n.The image of something seen that persists after the eyes are closed.Ĭantonese: 光譜 ／ 光谱 ( gwong 1 pou 2 ) Hakka: 光譜 ／ 光谱 ( kông-phú ) Mandarin: 光譜 ／ 光谱 (zh) ( guāngpǔ ).( abstract algebra, algebraic geometry ) The set, denoted Spec( R), of all prime ideals of a given ring R, commonly augmented with a Zariski topology and considered as a topological space.
( mathematics, functional analysis ) Of a bounded linear operator A, the set of scalar values λ such that the operator A-λI, where I denotes the identity operator, does not have a bounded inverse intended as a generalisation of the linear algebra sense.( mathematics, linear algebra ) The set of eigenvalues of a matrix.( chemistry ) The pattern of absorption or emission of radiation produced by a substance when subjected to energy (radiation, heat, electricity, etc.).But I am on the spectrum, and so I stared back at him. He punctuated his words with a look into my eyes that might have been read as threatening or menacing by anyone who was not on the spectrum.
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