For questions about Hardy spaces. Use the other related tag like (tag: complex-analysis) or (operator-theory).
Hardy spaces are classes of holomorphic functions on the unit disc which satisfy some integrability conditions. Namely, if $p>0$, then $H^p$ is the space of holomorphic functions such that $$\sup_{r\in (0,1)}\int_0^{2\pi}|f(re^{it})|dt<\infty.$$
