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2. Spectral geometry - Wikipedia

   en.wikipedia.org/wiki/Spectral_geometry

   Spectral geometry is a field in mathematics which concerns relationships between geometric structures of manifolds and spectra of canonically defined differential operators. ...

3. Spectrum (functional analysis) - Wikipedia

   en.wikipedia.org/wiki/Spectrum_(functional_analysis)

   In mathematics, particularly in functional analysis, the spectrum of a bounded linear operator (or, more generally, an unbounded linear operator) is a generalisation of the set of eigenvalues of a matrix.

4. Free spectral range - Wikipedia

   en.wikipedia.org/wiki/Free_spectral_range

   The free spectral range of a diffraction grating is the largest wavelength range for a given order that does not overlap the same range in an adjacent order. If the ( m + 1)-th order of λ {\displaystyle \lambda } and m -th order of ( λ + Δ λ ) {\displaystyle (\lambda +\Delta \lambda )} lie at the same angle, then

5. Spectrum of a matrix - Wikipedia

   en.wikipedia.org/wiki/Spectrum_of_a_matrix

   In mathematics, the spectrum of a matrix is the set of its eigenvalues. [ 1 ] [ 2 ] [ 3 ] More generally, if T : V → V {\displaystyle T\colon V\to V} is a linear operator on any finite-dimensional vector space , its spectrum is the set of scalars λ {\displaystyle \lambda } such that T − λ I {\displaystyle T-\lambda I} is not invertible .

6. Spectral power distribution - Wikipedia

   en.wikipedia.org/wiki/Spectral_power_distribution

   Mathematically, for the spectral power distribution of a radiant exitance or irradiance one may write: =where M(λ) is the spectral irradiance (or exitance) of the light (SI units: W/m 2 = kg·m −1 ·s −3); Φ is the radiant flux of the source (SI unit: watt, W); A is the area over which the radiant flux is integrated (SI unit: square meter, m 2); and λ is the wavelength (SI unit: meter, m).

7. Spectral graph theory - Wikipedia

   en.wikipedia.org/wiki/Spectral_graph_theory

   A pair of graphs are said to be cospectral mates if they have the same spectrum, but are non-isomorphic. The smallest pair of cospectral mates is {K 1,4, C 4 ∪ K 1}, comprising the 5-vertex star and the graph union of the 4-vertex cycle and the single-vertex graph. [1] The first example of cospectral graphs was reported by Collatz and ...