Let me go on immediately to acknowledge that these may not be the most philosophically sophisticated or historically representative discussions which took place in the Arabic tradition (see e.g., Hodges 2011a (in Other Internet Resources) on the subject matter of logic). They do however all have the advantage of having been discussed by a number of Arabic logicians through the centuries, and of having been the subject of at least some academic study. Other candidate topics illustrate what I seek to avoid. Consider the impressive work by Avicenna on proof theory which has been translated and analysed by Hodges (2009, Other Internet Resources); to the extent that I can follow this work, it exhibits a truly extraordinary level of logical acumen. At the same time I have never—in my admittedly narrow reading in the tradition—seen another logician develop or even use Avicenna's results in this area. In short, the topic illustrates Avicenna's logical genius rather than a common theme running through Arabic logic.