Murray Gell-Mann discussing why elegant equations more likely to be right than inelegant ones.
What is Beauty ? When in terms of some mathematical notation, you can write the theory in a very brief space, without a lot of complication that’s essentially what we mean by beauty or elegance.
What is the role of Unification ? We believe there is a unified theory underlying all the regularities. Steps toward unification exhibit the simplicity and self-similarity across the scales. Therefore the math for one skin (of the onion) allows you to express beautifully and simply the phenomenon of the next skin.
“You don’t need something more to explain something more.”