His pupil, the English scholastic Daniel of Morley, recorded one of Gerhard's methods[6] in translation: His Mozarabic assistant Ghalib (Latinized Galippus)[7] translated the text orally into medieval Castilian, Gerhard listened and wrote the text down in Latin. In the case of the Almagest, which had been translated from its original language of Ancient Greek first into Syriac, then into Arabic, and which Gerhard translated into Latin via the oral route of Castilian, this long chain of transmission introduced numerous sources of error.
Most mathematical notation wasn't invented until centuries later. At the time, they would just write calculations out in words. In particular, the use of x representing an unknown quantity was introduced by Descartes: https://en.wikipedia.org/wiki/History_of_algebra#The_symbol_...
For folks who are curious of this, one potential example/discussion of this is Thomas Harriot's _Artis Analyticae Praxis_ (ob. discl., I did some of the typesetting of the Muriel Seltman/Robert Goulding translation)
But I wonder, was some meaning lost from Greek|Latin -> Arabic -> Latin ?
His pupil, the English scholastic Daniel of Morley, recorded one of Gerhard's methods[6] in translation: His Mozarabic assistant Ghalib (Latinized Galippus)[7] translated the text orally into medieval Castilian, Gerhard listened and wrote the text down in Latin. In the case of the Almagest, which had been translated from its original language of Ancient Greek first into Syriac, then into Arabic, and which Gerhard translated into Latin via the oral route of Castilian, this long chain of transmission introduced numerous sources of error.
I was taught this many times in US schools.
Just consider that the X in math is not a latin X but a Greek Χ (chi) :)