ʿIlm-i ʿUqūd-i Abnīyih; A Key for Understanding of Relation between Science and Architecture n Islamic World

ʿIlm-i ʿUqūd-i Abnīyih first time is named in ʾIrshād al-Qāṣid from Ibn al-Akfānī; but reflection on primary sources shows this science has older antecedent. There is no text in this science from Islamic period; but be said Ibn al-Haytham and Karajī had have compilations in this science. Primary sources in science classification in Islamic world help us to obtain the clearer concept from this science. Search in this texts shows ʿIlm-i ʿUqūd-i Abnīyih was main science connected to architecture in Islamic sciences. This research defines ʿIlm-i ʿUqūd-i Abnīyih was lower than theoretical geometry and upper than practical geometry.