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Finite-codimensional subalgebras of pro-nilpotent algebras are open
Finite-codimensional subalgebra question. Must every subalgebra of finite codimension in $A$ be open?
Problemopenpro-nilpotent-algebras topological-algebrasarXiv posted 2 days ago

Finite-codimensional subalgebras of pro-nilpotent algebras are open