Traditionally it's been by how difficult it is to calculate, but now we can reorder it by how difficult it is to understand the concepts, however hard the calculating.
Zakonisht, ka qene e matur se sa e veshtire eshte te besh llogari matematikore, por tani ne mund to perseritim ato nepermejt nivelit te konceptiti dhe shkalles te veshtiresise, dhe perllogaritjes.