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Closure Relation

The closure relation is the identity

delta(x-t)=sum_(n=0)^inftyphi_n(x)phi_n(t),

where delta(x) is the delta function.

See also

Delta Function

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Cite this as:

Weisstein, Eric W. "Closure Relation." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/ClosureRelation.html

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