Spectral gap
From Infogalactic: the planetary knowledge core
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
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