Weak-type (pᵢ,qᵢ) interpolation: T bounded from weak-Lᵖⁱ to weak-Lᵠⁱ ⟹ strong bounded L^{pθ}→L^{qθ}. Key for Calderón-Zygmund.
Weak-type (pᵢ,qᵢ) interpolation: T bounded from weak-Lᵖⁱ to weak-Lᵠⁱ ⟹ strong bounded L^{pθ}→L^{qθ}. Key for Calderón-Zygmund.