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Estimation optimale du gradient du semi-groupe de la chaleur sur le ...

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706 D. Brydges, A. Ta<strong>la</strong>rczyk / Journal of Functional Analysis 236 (2006) 682–711<br />

Proposition 4.6. Assume that d = 1, Λ = (a, b), B = c(x) d<br />

, where c is twice continuously<br />

dx<br />

differentiab<strong>le</strong> and c2 (x) const > 0. Let s <strong>de</strong>note the sca<strong>le</strong> function of the diffusion process<br />

generated by −B ′ B. Then the kernel of the operator AL is of the form:<br />

⎧<br />

s(y)−s(a)<br />

2L(s(x)−s(a))<br />

s(b)−s(y)<br />

for a

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