The term "spectrum" can refer to various concepts depending on the context in which it is used. Here are some common interpretations: 1. **Physics and Light**: In physics, a spectrum refers to the range of different wavelengths of electromagnetic radiation. This includes visible light, which can be split into a spectrum of colors (red, orange, yellow, green, blue, indigo, violet) through a prism.
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The spectrum of a linear operator consists of the scalars for which is not invertible. In finite dimensions it is the set of eigenvalues.