I'm reading "Reason's nearest kin" of michael potter and he says:
Now the distinctive feature of reasoning that is ampliative rather than merely explicative is that it depends on objects as its subject matter. If polyadic logic is ampliative, it must therefore depend on objects in a way that syllogistic logic does not. The feature which makes this dependence manifest is the variable.
Can you develop further on the difference between ampliative and explanatory reasoning?