Consider this: the set consisting of married bachelors is the null set. This is obviously true.
Yes, because null is null.
Ergo, all members of the null set are married bachelors. Even though we all know that that there are no married bachelors.
True, again, null is null.
So, how is that wrong, considering that this is what very young math students use every day?
It's not wrong, you're just misapplying this to "All the Jews I know are Atheists"
And I think you're exaggerating again. Very young, is probably exaggerated here. "Use eveyday" is exaggerated. And even if it's true ( which is highly suspect ) it's just an ad-pop fallacy.
Again, you need to begin with a null set and apply a property to it.
Married bachelors are blue is false.
If you are a math teacher, and you are teaching this to your students, you are teaching them wrong.
Answer this: Are Atheists a null set?
Now. This is a true statement: "All the Atheist Jews you know is null".