I used to think 1 by 1 matrix is a scalar, but someone argued with me and said they were different. Then I tried to convince him that we actually couldn't find the difference between their fields. He then told me the fields were just isomorphic, so he still didn't agree with my opinion. I can't say he's wrong, but it's just kind of ridiculous to me. It's like saying that one, two three.......are not 1,2,3....., they are just isomorphic. Can somebody explain it for me?