arXiv2026
Let $θ$ be an ordinal and let $(N_α)_{α\leqθ}$ be a continuous increasing tower of closed normal subgroups of a Hausdorff topological group $G$, with $N_0=\{e\}$. Write $ρG$ for the Raikov completion of $G$, and put $K_α=\overline{N_α}^{ρG}$ and $H_α=GK_α$. The successive and limit differences of the groups $H_α$ mark the first stages at which points of $ρG$ become old quotient points. For every nonzero ordinal $θ$ and every set $S\subseteq(0,θ]$, there is a Hausdorff pseudocompact Boolean group with a continuous tower of closed normal subgroups such that every member of the tower is pseudocompact and the nonempty strata occur exactly at the stages in $S$. The terminal quotient can simultaneously be chosen isomorphic to $\mathbb Z/2\mathbb Z$, and for every $δ<θ$ the successive factor $N_{δ+1}/N_δ$ is compact exactly when $δ+1\notin S$. Thus a tower may have a single nonempty stratum at a limit stage even when every successive factor is compact. For a closed normal subgroup $N$ of $G$, let $\widehat q:ρG\toρ(G/N)$ extend the quotient homomorphism and put $K=\overline N^{ρG}$. Over $gN\in G/N$, the fiber in $ρG\setminus G$ is $g(K\setminus N)$, homeomorphic to $ρN\setminus N$, while for $y\in\widehat q(ρG)\setminus(G/N)$ the entire $\widehat q$-fiber lies in $ρG\setminus G$ and is homeomorphic to $ρN$. For precompact kernels this gives a canonical decomposition, and nested quotients give the two-stage identity underlying the transfinite filtration. Further results concern pseudocompact Raikov remainders and include countable Abelian examples.