This study explores Abu Salt Dani (d. 579/1134) and Ibn Tumlus's (1160-1223)examination of propositions. Firstly, it examines Abu Salt Dani's wievs on propositions,which can be summed up in four main categories: quality of proposition, quantityof proposition, mutuality of proposition and modality of proposition. Contrary to theapproaches of most muslim logicians, he starts his survey with all types of modalproposition, which can be classified in four main categories: absolute, possible,necessary, impossible. Secondly, ıt examines Ibn Tumlus's wievs on proposition. IbnTumlus also examines quality of proposition, quantity of proposition, mutuality ofproposition and modality of proposition. Furthermore, he examines, simple,component and conditional propositions. Finally, it will compare the approachs ofthese two logicions.

This study explores Abu Salt Dani (d. 579/1134) and Ibn Tumlus's (1160-1223)examination of propositions. Firstly, it examines Abu Salt Dani's wievs on propositions,which can be summed up in four main categories: quality of proposition, quantityof proposition, mutuality of proposition and modality of proposition. Contrary to theapproaches of most muslim logicians, he starts his survey with all types of modalproposition, which can be classified in four main categories: absolute, possible,necessary, impossible. Secondly, ıt examines Ibn Tumlus's wievs on proposition. IbnTumlus also examines quality of proposition, quantity of proposition, mutuality ofproposition and modality of proposition. Furthermore, he examines, simple,component and conditional propositions. Finally, it will compare the approachs ofthese two logicions.