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The first part of this article presents some introductory ideas to the study of Aristotle’ Second Analytics in the Islamic West, following the bibliography utilized for this
article and trying to trace a history of the perception on the content of this subject and of the manner of conceiving the theory of demonstration in this very space. This aspect will be presented through a methodological paradigm, as an answer to the question: ‟How was the theory of demonstration perceived in relation to logic in the Islamic
West?”. In this way, by clarifying this answer, we intend to provide an historical synthesis of the theory of demonstration in the attempt to integrate it into the discipline of the history of theoretical philosophy written in Classical Arabic in the Xth century A.D.
The second part of the article is focused on showing the role that the logic written by the Brethren of Purity had within the discipline of Classical logic written in Classical Arabic in the Xth century A.D. By respecting the ideas of the conference Philosophy in the Islamic West: Philosophers and less-known works, 25-26 April
98
2019, Marrakech, we wanted to bring to light1 the content of the epistle Fī ma‘nā
’Anālūṭīqā ṯ-ṯāniyati2 of the first section Ar-rasā’ilu r-riyāḍiyyatu [The Epistles [on the] MSciences]] from the encyclopaedia The Epistles of the Brethren of Purity
[Rasā’ilu ’Iḫwāni ṣ-Ṣafā’i] that was transmitted to the West by al-Kirmānī of Córdoba3 and was known by the Latin medieval world as being written by al-Kindī, or, utilizing other sources, such as al-Fārābī.4
The last part of the article corresponds to a reflection on the theoretical dimension of the demonstration written in Classical Arabic which is present within the writing of
the Brethren of Purity and identifies the practical utility of this theory developed by them in their writing. The objective of such an endeavor was to remove the veil that was left on their theory on logic.