diff --git a/src/eva2/tools/des/DESSolver.java b/src/eva2/tools/math/des/DESSolver.java
similarity index 97%
rename from src/eva2/tools/des/DESSolver.java
rename to src/eva2/tools/math/des/DESSolver.java
index d9b79884..c5eb263f 100644
--- a/src/eva2/tools/des/DESSolver.java
+++ b/src/eva2/tools/math/des/DESSolver.java
@@ -6,7 +6,7 @@
  * @version 1.0
  */
 
-package eva2.tools.des;
+package eva2.tools.math.des;
 
 import java.io.Serializable;
 
diff --git a/src/eva2/tools/des/DESystem.java b/src/eva2/tools/math/des/DESystem.java
similarity index 97%
rename from src/eva2/tools/des/DESystem.java
rename to src/eva2/tools/math/des/DESystem.java
index 80c8fd8d..b27adf3d 100644
--- a/src/eva2/tools/des/DESystem.java
+++ b/src/eva2/tools/math/des/DESystem.java
@@ -1,4 +1,4 @@
-package eva2.tools.des;
+package eva2.tools.math.des;
 
 import java.io.Serializable;
 
diff --git a/src/eva2/tools/des/RKSolver.java b/src/eva2/tools/math/des/RKSolver.java
similarity index 99%
rename from src/eva2/tools/des/RKSolver.java
rename to src/eva2/tools/math/des/RKSolver.java
index aba38ce5..364544bc 100644
--- a/src/eva2/tools/des/RKSolver.java
+++ b/src/eva2/tools/math/des/RKSolver.java
@@ -1,4 +1,4 @@
-package eva2.tools.des;
+package eva2.tools.math.des;
 
 import java.io.Serializable;