Math

Mathematics, according to Wikipedia, has no generally accepted definition.  I found that to be a bit surprising, since we could all probably agree that we know it when we see it.  It’s about quantity, structure, space, and change, and it’s about numbers and letters, and LaPlace Transforms. 

Math problems practically always have one answer, a ‘correct’ answer.  On the other hand, engineering or technical problems, as well as art and politics, have many answers and possible interpretations.  There’s nuance involved, and judgement required.  But math doesn’t care what your opinion is or what you think about it.  It just is.