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Example: The Brownian sheet on R NE{W (t)} = 0E{W (s)W (t)} = (s 1 ∧ t 1 ) × · · · × (s N ∧ t N ).w<strong>here</strong> t = (t 1 , . . . , t N ).◮ Replace j by j = (j 1 , . . . , j N )⇒ϕ j (t) = 2 N/2 N ∏i=12(2j i + 1)π sin ( 12 (2j i + 1) πt i)W (t) = ∑ · · · ∑ξ j1 ,...,j Nϕ j1 ,...,j N(t)j 1◮ N = 1W is standard Brownian motion.The corresponding expansion is due to Lévy, and thecorresponding RKHS is known as Cameron-Martin space.j N

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