Spectral gap
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For the physical quantity, see Spectral gap (physics).
In mathematics, the spectral gap is the difference between the moduli of the two largest eigenvalues of a matrix or operator; alternately, it is sometimes taken as the smallest non-zero eigenvalue. Various theorems relate this difference to other properties of the system.
See:
- Expander graph (discrete case)
- Poincaré inequality (continuous case)
See also[]
- Spectral radius
- Eigengap
- Spectral gap (physics)
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