I came across the word ''apparatus'' in this phrase:
''The introduction of a formal apparatus for inductive logic'' in this article: https://plato.stanford.edu/entries/epistemology-bayesian/
What does it mean in this context? What should I understand? Does it mean ''a formal system'' or literally ''formal equipment, tool''?
I have checked the dictionaries, of course, but I am not sure which meaning is compatible with this particular usage in the article. Can you help me? Thank you.