Keeping textbooks containing words that may affect one's beliefs

Q: I am a science student and I have a bunch of math textbooks. These are strictly math textbooks as I understand. In one of the books, the author mentions solving equations in their multiple variable "incarnations". I assume the author means "form" because there is no religious meaning here as far as I can tell. In a different book, the author tells a short biography of a mathematician who was also an astrologer. The presence of such words disturbs me. I would like to know if there is something wrong with me continuing to read these textbooks and can I keep them or not. 

A: If it in no way disrupts your beliefs and your understanding of deen then it is permissible, provided the author also does not intend getting into any subject that will conflict with your deen.

And Allah Ta'ala (الله تعالى) knows best.

عن أبي الحوراء السعدي قال: قلت للحسن بن علي رضي الله عنهما: ما حفظت من رسول الله صلى الله عليه وسلم؟ قال: حفظت منه دع ما يريبك إلى ما لا يريبك (سنن النسائي، الرقم: 5711، سنن الترمذي، الرقم: 2519، و قال الترمذي: هذا حديث صحيح)

Answered by:

Mufti Ebrahim Salejee (Isipingo Beach)