Hi everyone I missed some content in my lecture about atomic structure of atoms. In the lecture, the lecturer talked something about "slipping" , "easy directions" and "slip systems"...I don't really catch these stuff in this lecture. But I could find these in textbook. What makes me most confusing is "long range" and "short range" translation. I just recall that they are something about how an atom slip over a closest packed plane, and the lecturer throw out some "short range" and "long range" and finally said that it is some "zig-zag" movement for face-centered-cubic indeed... something like this...Is there anyone know what is the content? Can you explain to me? Really many thanks!!!