On pointwise products of symmetric quasi Banach spaces and applications
Let $E_1,\;E_2$ be symmetric quasi Banach function spaces on $(0,α)\;(0<α\le\8)$. We study some properties of several constructions (the products $E_1(\M)\odot E_2(\M)$, the Calder$\rm\acute{o}$n spaces $E_1(\M)^θE_2(\M)^{1-θ}$, the complex interpolation spaces $(E_1(\M),E_2(\M))_θ$, the real interpolation method $(E_1(\M),E_2(\M))_{θ,p}$) in the context of noncommutative symmetric quasi Banach spaces. Under some natural assumptions, we prove $$ (E_1(\M), E_2(\M))_θ=E_1(\M)^θE_2(\M)^{1-θ}=E_1^{(\frac{1}θ)}(\M)\odot E_2^{(\frac{1}{1-θ})}(\M)\;(0<θ<1). $$ As application, we extend these result to the noncommutative symmetric quasi Hardy spaces case. We also obtained the real case of Peter Jones' theorem for noncommutative symmetric quasi Hardy spaces.