diff --git a/README.md b/README.md
index 4abd171..91b6f99 100644
--- a/README.md
+++ b/README.md
@@ -7,5 +7,4 @@ Lotto prediction with Genetic Algorithm and Mersenne Twister (MT19937)
 ## Theory
   * [Combining Probabilities with “And” and “Or”](https://math.libretexts.org/Bookshelves/Applied_Mathematics/Book%3A_College_Mathematics_for_Everyday_Life_(Inigo_et_al)/03%3A_Probability/3.02%3A_Combining_Probabilities_with_And_and_Or)
   * [Mersenne prime](https://en.wikipedia.org/wiki/Mersenne_prime)
-  * [Riemann hypothesis](https://en.wikipedia.org/wiki/Riemann_hypothesis)
   * [Genetic algorithmh](https://en.wikipedia.org/wiki/Genetic_algorithm)