I know the meaning of tend and there is but I cannot get exact meaning and grammatical rule of there does tend to be in the following sentence:
In applied mathematics (mechanics, statistics, decision mathematics, and so on), there does tend to be more focus on solving problems and less on developing abstract theories. (source: How to Study for a Mathematics Degree by Lara Alcock)
-----Edit (clarifying my question)
What is the difference between the following forms in meaning and what are the grammatical structure of the sentences?
- There is more focus on solving problems.
- There tends to be more focus on solving problems.
- There does tend to be more focus on solving problems.