Update README.

README.md

@@ -46,7 +46,7 @@ To use the `evaluate` module, pass a list of samples and a similarity function o
 ```
 
 ### Inputs
-- **samples**: an iterable containing $n$ samples to score; an n x n similarity
+- **samples**: an iterable containing n samples to score; an n x n similarity
        matrix K, or an n x d feature matrix X.
 - **k**: a pairwise similarity function, or a string identifying a predefined 
        similarity function. If k is a pairwise similarity function, it should