我們探討 近橢圓形 Besov 函數局限於更低維道時的狀況，或是把此類函數延伸跨越它們定義的區域時的性質。 ;We investigate what happens when Sub-Elliptic Besov functions are extendedbeyond its domain of definition when the domain's boundary satisfies certaingeometric conditions. We also investigate what happens when a Besov functionis restricted to a lower dimension subset.
