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Karma is like a middle number. Just as a middle number is formed by subtracting one from a higher number and adding one to a lower number, so too are the middle numbers between the lowest and highest numbers of a category.
All the lowest and all the highest numbers are of one type each; but the middle numbers are not of one type. There are countless differences in the middle numbers, countless differences in the middle innumerable, and countless differences in the middle infinite, because the lowest or highest number refers to a fixed number, but this is not the case with the middle number. There are units between the lowest and highest numbers, there are infinitesimal units between the lowest and highest innumerable, and there are infinite units between the lowest and highest infinite, which are called 'middle number', 'middle innumerable', and 'middle infinite' respectively.
Wherever the term 'infinite' is used in the scriptures, it always refers to the 'middle infinite'.
The author of this section calls it "Sukshmartham Vichar" because it discusses many subtle topics.