Interpolation Between $H^p$ Spaces and Non-Commutative Generalizations II

We continue an investigation started in a preceding paper. We discuss the classical results of Carleson connecting Carleson measures with the $\d$-equation in a slightly more abstract framework than usual. We also consider a more recent result of Peter Jones which shows the existence of a solution of the $\d$-equation, which satisfies simultaneously a good $L_ı$ estimate and a good $L_1$ estimate. This appears as a special case of our main result which can be stated as follows: Let $(Ω,\cal{A},μ)$ be any measure space. Consider a bounded operator $u:H^1\ra L_1(μ)$. Assume that on one hand $u$ admits an extension $u_1:L^1\ra L_1(μ)$ bounded with norm $C_1$, and on the other hand that $u$ admits an extension $u_ı:L^ı\ra L_ı(μ)$ bounded with norm $C_ı$. Then $u$ admits an extension $\w{u}$ which is bounded simultaneously from $L^1$ into $L_1(μ)$ and from $L^ı$ into $L_ı(μ)$ and satisfies $$\eqalign{&\|\tilde u\colon \ L_\infty \to L_\infty(μ)\|\le CC_\infty\cr &\|\tilde u\colon \ L_1\to L_1(μ)\|\le CC_1}$$ where $C$ is a numerical constant.

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