I have a vocabulary Area for classifying maths problems, with two parent terms (Pure and Applied) and appropriate child terms (Geometry, etc.) under each. Problems (a content type) are tagged with the appropriate areas of mathematics that they cover.
I also have a table page defined in Views with filter criteria Type (= Problem) and Area (exposed), for listing all the problems.
The problem I have is as follows: If someone selects `Applied Mathematics', nothing appears, because Problems are only tagged with the child terms.
How can I get all the Problems to show up?
In Drupal 7 I should add!