What Formal Languages Can Transformers Express? A Survey Lena Strobl author William Merrill author Gail Weiss author David Chiang author Dana Angluin author 2024 text journal article Transactions of the Association for Computational Linguistics continuing MIT Press Cambridge, MA periodical academic journal strobl-etal-2024-formal 10.1162/tacl_a_00663 https://aclanthology.org/2024.tacl-1.30/ 2024 12 543 561