Avicenna’s most influential works were Kitāb al-shifāʾ (Book of the Cure, or The Cure), an encyclopaedic exposition of logic, physics, mathematics, and metaphysics, and Al-Qānūn fī al-ṭibb (The Canon of Medicine), one of the most important texts in the history of medicine. More than 200 extant works have been attributed to him.