_This mirror for princes sheds light on the relationship between spiritual and political authority in early modern Egypt_ This guide to political behavior and expediency offers advice to Sufi shaykhs, or spiritual guides, on how to interact and negotiate with powerful secular officials, judges, and treasurers, or emirs. Translated into English for the first time, it is a unique account of the relationship between spiritual and political authority in late medieval / early modern Islamic society.

The Liber de compositione alchemiae or the The Book of the Composition of Alchemy is believed to have been the first book on alchemy that was translated from Arabic into Latin. The translator was the Englishman Robert of Chester who was one of the earliest translators to flock to Spain to learn Arabic and to translate some of the Arabic works. He completed his translation on 11 February, 1144.

This paper presents an edition of al-Hasan ibn al-asan ibn al-Haytham's treatise, Qawl fi samt al-qibla bi-al-isāb with translation and commentary. In it Ibn al-Haytham provides a universal method for finding the direction of the qibla at any location on the surface of the earth by using spherical trigonometry and accurate calculation. Ibn al-Haytham's computational solution has not been studied before, and it has often been confused with another work of his in which he uses an analemma construction to solve (...) the problem of the qibla graphically. As a result of this confusion, contemporary scholars have mistakenly attributed the first universal solution of the qibla problem to Jamshīd al-Kāshī, some four centuries after the introduction of this method by Ibn al-Haytham. The present treatise represents an important juncture in the history of the development of mathematics of the qibla, and sheds more light on the contributions of one of the most important scientists of medieval Islam. (shrink)

This article studies Ibn al-Haytham’s treatment of the common notions from Euclid’s Elements (usually referred to today as the axioms). We argue that Ibn al-Haytham initiated a new approach with regard to these foundational statements, rejecting their qualification as innate, self-evident, or primary. We suggest that Ibn al-Haytham’s engagement with experimental science, especially optics, led him to revise the framing of Euclidean common notions in a way that would fit his experimental approach.

Bu çalışma hicrî birinci asrın ikinci yarısında Basra’da hadis ve fıkıh sahasındaki ilmî hareketliliği konu edinir. İlgili dönemde, orada yaşayan sahâbenin en meşhuru ve Hz. Peygamber’le en uzun süre birlikteliğe sahip olması hasebiyle, Enes b. Mâlik’in Basra’daki etkisi özel olarak ele alınır. Bu amaçla Enes b. Mâlik’le ilgili birçok rivayet tahlil edilir ve onun hem Basra’da hem de diğer şehirlerde yaşayan sahâbe ve tâbiûnla arasındaki ilmî ilişkileri üzerinde durulur. Çalışma mezkûr zaman diliminde Basra’da hadis faaliyetlerinin fazla, fıkıh faaliyetlerinin ise az (...) olduğunun tezahürlerini gösterir. Enes’in öğrencileri üzerindeki etkisi; öğrencilerinin fakih mi yoksa muhaddis mi olduğu araştırılır. Enes’in tabiûnla ilişkileri, kendisine yapılan rihleler, başka şehirlerde yaşayan fakih tabiûnun ondan rivayeti, İbn Ebî Şeybe’nin Musannef’i çerçevesinde onun fıkhî şahsiyeti ve başka meseleler incelenir. Böylece onun fıkhî melekesinin İbn Abbas ve İbn Ömer’le aynı derecede olmadığı ve benzer şekilde Basra’nın sahabenin fakihlerinden tabiûnun fakihlerine nakledilen “amel-i mütevâres”e önem veren Medine ve Kufe gibi bir fıkıh şehri olmadığı sonucuna ulaşılır. Basra, müksirûndan olan sahabî Enes b. Malik sayesinde hadislerin rivayetine, yayılmasına ve onlarla amel edilmesine önem verilen bir şehirdi. Ancak bu hadislerin yayılması aynı dönemde Mekke’de İbn Abbas’ın faaliyetleri ile kıyaslanabilecek bir fıkhî faaliyeti de beraberinde getirmedi. Dolayısıyla Basra sahabe döneminde fıkıh ilmî açısından geri kalırken hadis sahasında hareketliydi. Bu nedenle ona fıkıh ve “amel-i mütevâres” değil rivayet şehri denilmesini hak etmektedir. (shrink)

This is an analytical examination of Ibn Khaldun's epistemology, centred on Chapter Six of the Muqaddima. In this chapter, entitled The Book of Knowledge (Kitab al'Ilm), Ibn Khaldun sketched his general ideas about knowledge and science and its relationship with human social organisation and the establishment of a civilisation.

En este artículo se lleva a cabo una descripción detallada del ms. 80 de la Zāwiya Ḥamzawīya. Es un maŷmū‛ recopilado, en su mayor parte, por un mismo copista del que desconocemos su nombre completo, aunque no el de su padre: ‛Umar b. Aḥmad b. Abī-l-Qāsim al-Šarīf. El maŷmu‛ contiene 427 folios con textos de variado contenido, predominando los de carácter astronómico. Entre otras obras, incluye una copia del Kitāb fī-l-‛amal bi-l-asturlāb de Abū-l-Ṣalt de Denia; el Kitāb min ‛ilm al-awqāt (...) bi-l-ḥisāb de Ibn al-Bannā de Marrākuš; el Tanbīh al-anām ‛alà mā yaḥduṯu fī ayyām al-‛ām de al-Ŷādīrī, así como su Urŷuza Rawḍat al-Azhār; y la única copia del Kitāb al-nuŷūm de ‛Abd. al-Mālik b. Ḥabīb. (shrink)

Ibn Taymīyah, Aḥmad ibn ʻAbd al-Ḥalīm, 1263-1328; views on philosophy, Islamic; Muslim philosophers; history; apologetic work; editor's Ph.D. dissertation.

Averroës,1126-1198; criticism and interpretation; Ibn Taymīyah, Aḥmad ibn ʻAbd al-Ḥalīm,1263-1328.

For the safe and economical construction of embankment dams, the mechanical behaviour of the rockfill materials used in the dam’s shell must be analyzed. The characterization of rockfill materials with specified shear strength is difficult and expensive due to the presence of particles greater than 500 mm in diameter. This work investigates the feasibility of using an extreme gradient boosting computing paradigm to estimate the shear strength of rockfill materials. To train and validate the proposed XGBoost model, a total of (...) 165 databases obtained from the literature are chosen. The XGBoost model was compared against support vector machine, adaptive boosting, random forest, and K-nearest neighbor models described in the literature. XGBoost beats SVM, RF, AdaBoost, and KNN models in terms of performance evaluation metrics such as coefficient of determination, Nash–Sutcliffe coefficient, and error in the root mean square ratio to the standard deviation of the measured data. The results demonstrated that the XGBoost model has the highest prediction performance with, followed by the SVM model with, RF, the AdaBoost model with and the KNN model with. A sensitivity analysis has been conducted to ascertain the impact of each investigated input parameter. This study demonstrates that the established XGBoost model for estimating the shear strength of rockfill materials is reliable. (shrink)

This paper proposes to present a novel method of generating cryptographic dynamic substitution-boxes, which makes use of the combined effect of discrete hyperchaos mapping and algebraic group theory. Firstly, an improved 2D hyperchaotic map is proposed, which consists of better dynamical behaviour in terms of large Lyapunov exponents, excellent bifurcation, phase attractor, high entropy, and unpredictability. Secondly, a hyperchaotic key-dependent substitution-box generation process is designed, which is based on the bijectivity-preserving effect of multiplication with permutation matrix to obtain satisfactory configuration (...) of substitution-box matrix over the enormously large problem space of 256!. Lastly, the security strength of obtained S-box is further elevated through the action of proposed algebraic group structure. The standard set of performance parameters such as nonlinearity, strict avalanche criterion, bits independent criterion, differential uniformity, and linear approximation probability is quantified to assess the security and robustness of proposed S-box. The simulation and comparison results demonstrate the effectiveness of proposed method for the construction of cryptographically sound S-boxes. (shrink)

Ibn Taymīyah, Aḥmad ibn ʻAbd al-Ḥalīm, 1263-1328. Naqḍ al-manṭiq; Islamic philosophy; logic.

Acts of violence arising from hatred, racism, and bigotry have no place in a world of civility. The brutal attacks on Muslim worshippers at two mosques in Christchurch, New Zealand, leaving 51 dead and 49 injured, can never be justified. Through adopting Van Dijk's ideological square of 'Us. vs. Them' [3], the present study uncovers the impact statements of the attacks' survivors and victims' families, denouncing the severity of the event and expressing the shattering effects of the attacks on self, (...) society, and humanity at large. Over a period of three days, about 90 people delivered their statements in the High Court in Christchurch. The data were compiled through YouTube videos and news articles that reported the testimonies. The findings showed that the overall discursive strategy used in the impact statements is that of positive self-presentation and negative other-presentation. Such presentations are realized by focusing on the positive aspects of the ingroup members represented by the attacks' survivors, victims' families, and people of New Zealand on the one hand, and the negative characteristics of the out-group members represented by the terrorist, on the other. As the paper sends a strong message for accepting 'otherness' and rejecting antagonism, it is of significance to readers and researchers in inter-faith dialogue, human rights, equality, freedom, and justice. (shrink)