Columbia subject headings:
Ikhwān al-Ṣafāʼ.
Ikhwān al-Ṣafāʼ. Rasāʼil.
Islamic philosophy--Early works to 1800.
Mathematics, Arab.
Mathematics--Philosophy.
Metaphysics.
Philosophy, Arab--Early works to 1800.
Harvard subject headings:
Ikhwān al-Ṣafāʼ.
Ikhwān al-Ṣafāʼ. Rasāʼil.
Islamic philosophy--Early works to 1800.
Mathematics, Arab.
Mathematics--Philosophy
Metaphysics
Philosophy, Arab--Early works to 1800.
Princeton subject headings:
Ikhwān al-Ṣafāʼ.
Ikhwān al-Ṣafāʾ. Rasāʾil.
Islamic philosophy--Early works to 1800.
Mathematics, Arab.
Mathematics--Philosophy.
Metaphysics.
Philosophy, Arab--Early works to 1800.