Does any branch of mathematics concern exclusively the dissimilarity of patterns?
Indeed, this is one of the reasons I believe Mathematics is so applicable to everything. If something has some pattern, we use maths to study it. If it doesn't have a pattern, we call it random and do statistical analysis on that. However something turns out, we have maths for it!Considering that math concerns the similarity of patterns, I guess that dissimilarity is a pattern unto itself.