Your problem is the same as the two above you - your math background sucks.
Bachelor of Science, Comp Sci, 1992. Bachelor of Science, Algorithmic Mathematics, 1992. A good portion of that was set theory.

Your problem is that your programming background sucks. You also seem to have difficulty realizing that math terms are often not the same as the equivalent comp sci term. Deal with it. Or when you start talking about nulls and sets, make it clear you are talking about math, and not programming. They aren't the same. Or if that's the total point, say so.