{'fraction_non_alphanumeric': 0.016474464579901153, 'fraction_numerical': 0.0, 'mean_word_length': 5.268041237113402, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Complete Path Algebras and Rational Modules

We study rational modules over complete path and monomial algebras, and the problem of when rational modules over the dual C of a coalgebra C are closed under extensions, equivalently, when is the functor Rat a torsion functor. We show that coreexivity, closure under extensions of nite dimensional rational modules and of arbitrary modules are Morita invariant, and that they are preserved by subcoalgebras. We obtain new large classes of examples of coalgebras with torsion functor, coming from monomial coalgebras, and answer some questions in the literature.