In *The Foundations of Arithmetic: A Logico-Mathematical Enquiry Into the Concept of Number" by G. Frege pages XV and XVi we read:
A typical crudity confronts me, when I find calculation described as "aggregative mechanical thought". I doubt whether there exists any thought whatsoever answering to this description. An aggregative imagination, even, might sooner be let pass; but that has no relevance to calculation.
The present work will make it clear that even an inference like that from n to n + i. which on the face of it is peculiar to mathematics, is based on the general laws of logic, and that there is no need of special laws for aggregative thought.
What is the exact meaning of "aggregative"? I searched Google Books and the internet but there is not any obvious explanation of it.
Frege says in the footnote that Kuno Fischer in his System der Logik und Metaphysik: oder Wissenschaftslehre section 94 describe calculation as "aggregative mechanical thought" but I dont know German and cannot read the source. Would you please help me grasp it?