Changed formula to plain text in the index

RodionGork · web-flow · commit 6e962dcf4d00 · 2016-10-05T16:17:11.000+03:00
diff --git a/src/index.md b/src/index.md
@@ -33,7 +33,7 @@ especially popular in field of competitive programming.*
 - [Kraut & Determinant](./linear_algebra/determinant-kraut.html)
 
 ### Geometry
-- [Length of the union of intervals on a line in $O(n\log n)$](./geometry/length-of-segments-union.html)
+- [Length of the union of intervals on a line in O(N\*logN)](./geometry/length-of-segments-union.html)
 - [Circle-Line Intersection](./geometry/circle-line-intersection.html)
 - [Circle-Circle Intersection](./geometry/circle-circle-intersection.html)
 
