The document discusses several important Islamic mathematicians and their contributions, including:
1) Muhammad Ibn Musa Al-Khwarizmi, known as the "father of algebra", who wrote the seminal text on the subject which gave rise to the term "algebra".
2) Abu Yusuf Yaqub Ibn Ishaq Al-Kindi, the first Arab philosopher, who wrote eleven texts on numbers and numerical analysis.
3) Abu Bakr Ibn Hussein who wrote texts covering arithmetic, algebra, and geometry that were used as standard textbooks.
4) Muhammad Ibn Jabir Ibn Sinan Abu Abdullah, known as the "father of trigonometry",