« It Is not certain just what the terms weet-jabr and muqabalah mean, but the usual interpretation is similar to that implied in the translation above. The word al-jabr presumably meant something like "restoration" or "completion" and seems to refer to the transposition of subtracted terms to the other side https://everett-mcnamara-2.technetbloggers.de/het-feit-over-wrapfolie-brons-dat-niemand-voorstelt