Alham's Theory of Demonstration Is Retained, but Only if We Are Judging That Something Is True

Alham's position on this question was controversial in his own time. He concludes that aristotle's theory of demonstration can be retained, but only if we assume that the objects of demonstrative scientific knowledge are mental sentences. As he puts it, one cannot assent to a rock or cow. But alcom insists that when we form a judgment, we are judging that something is true. And only sentences can be true.