In this note we present some remarks on big Cohen-Macaulay algebras. Our
methods for doing this are inspired by the notion of dagger closure and by
ideas of Northcott on dropping of the Noetherian assumption of certain
homological properties.
For a Noetherian local domain $R$ let $R^+$ be the absolute integral closure
of $R$ and let $R_{\infty}$ be the perfect closure of $R$, when $R$ has prime
characteristic. In this paper we investigate the projective dimension of
residue rings of certain ideals of $R^+$ and $R_{\infty}$. In particular, we
show that any prime ideal of $R_{\infty}$ has a bounded free resolution of
countably generated free $R_{\infty}$-modules. Also, we show that the analogue
of this result is true for the maximal ideals of $R^+$, when $R$ has residue
prime characteristic.