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Let k( ⋅ , ⋅ ) be a continuous kernel defined on Ω × Ω, Ω compact subset of , , and let us consider the integral operator from into ( set of continuous functions on Ω) defined as the map
is a compact operator and therefore its spectrum forms a bounded sequence having zero as unique accumulation point. Here, we first consider in detail the approximation of by using rectangle...
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