A good definition of “null set” is the contents of an “education” degree.
Thanks, education unions, you’re living down to your reputations.
We called them "Mrs." degrees.
I've been known to defend teachers on this forum, but you are 100% correct there.
University schools of education should all be abolished, as they are actually worse than useless. They teach concepts and practices that go against reality and common sense.
In my opinion, if you want to teach, say, math, you should have to get a degree in math (not education) then apprentice out to a recognized master math teacher.