Liú Yùsōn 劉玉蓀, Qīng-dynasty pupil of 李光地 Lǐ Guāngdì (1642–1718), known as one of the figures of the Lǐ Guāngdì school of Yìxué alongside 楊名時 Yáng Míngshí; specific biographical details not preserved in the Sìkù notice.