Historical clue formulations

• Mathematical subgroup — 2024-03-09
• Subdivision in group theory — 2020-08-04
• 48-Down subgroup — 2017-07-01
• Math subgroup — 2014-02-20
• "Left" or "right" group, in math — 2013-01-18
• Mathematical grouping — 2006-12-09
• Mathematical subgroup — 2000-04-02
• Algebraic grouping — 1996-10-08