Commit 2021-04-07 02:18 8b33d740

chore(group_theory/specific_groups/*): new folder specific_groups (#7018) This creates a new folder specific_groups analogous to analysis.special_functions. So far, I have put cyclic (split from order_of_element), dihedral, and quaternion there. Related Zulip discussion: https://leanprover.zulipchat.com/#narrow/stream/113488-general/topic/group_theory.2Especific_groups