Unreachability of Inductive-Like Pointclasses in $L(\mathbb{R})$

Derek Levinson, Itay Neeman, Grigor Sargsyan

Hjorth proved from $ZF+AD+DC$ that there is no sequence of distinct ${\Sigma }_2^1$ sets of length ${\delta }_2^1$. Sargsyan extended Hjorth's technique to show there is no sequence of distinc…