the original Arabic term for algebra, widely known and used in the mathematical community in Dodgson’s time, was al jebr e al mokabala or “restoration and reduction”

It’s actually the title of the 9th century book that introduced the world to algebra: https://en.wikipedia.org/wiki/The_Compendious_Book_on_Calculation_by_Completion_and_Balancing

It’s actually the title of the 9th century book that introduced the world to algebra: https://en.wikipedia.org/wiki/The_Compendious_Book_on_Calculation_by_Completion_and_Balancing