Question
d possible types of two dmensional lattice &3 D primitive unit cells are resp.
ans 5& 7
Joshi sir comment

and in 3 D these are 7 crystal system, I have given an article for these 7 already
d possible types of two dmensional lattice &3 D primitive unit cells are resp.
ans 5& 7

and in 3 D these are 7 crystal system, I have given an article for these 7 already