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

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

Proposition 4.4. Let d = 1, B = d/dx, Λ = (a, b) and L>0, then the operator AL of Theorem<br />

2.8 is of the form ALϕ(y) = <br />

(a,b) aL(y, x)ϕ(x) dx, where<br />

⎧<br />

0 for (y, x) /∈ (a, b) × (a, b),<br />

⎪⎨ y−a<br />

2L(x−a) for a

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