I wonder if mathematical books from USA/UK better than for example russian books? I use mostly russian ( i live in eastern Europe), and they are hard for self-learning person (i'm thinking about books for mathematicians-to-be, not engineers). I wonder if books that are used in UK/USA sre much better. I was using Fichtenholz's book for calculus till now, but i'm thinking about changing to Spivak. I would like to know opinion of someone, who have had experience with both - eastern and western books. Also, Correcting my english is welcome.