diff --git a/resources/bytecode/javFiles/Matrix.jav b/resources/bytecode/javFiles/Matrix.jav
index 31868108..bac0b88a 100644
--- a/resources/bytecode/javFiles/Matrix.jav
+++ b/resources/bytecode/javFiles/Matrix.jav
@@ -1,4 +1,4 @@
-import java.util.AbstractList;
+import java.util.List;
 import java.util.Vector;
 import java.lang.Integer;
 //import java.lang.Float;
diff --git a/src/main/java/de/dhbwstuttgart/typeinference/constraints/Constraint.java b/src/main/java/de/dhbwstuttgart/typeinference/constraints/Constraint.java
index 0ac2a84e..dd5b84da 100644
--- a/src/main/java/de/dhbwstuttgart/typeinference/constraints/Constraint.java
+++ b/src/main/java/de/dhbwstuttgart/typeinference/constraints/Constraint.java
@@ -44,7 +44,7 @@ public class Constraint<A> extends HashSet<A> {
 	}
 	
 	public Boolean isOverridden() {
-		return isInherited;
+		return isOverridden;
 	}
 	
 	public Constraint<A> getExtendConstraint() {
diff --git a/src/main/java/de/dhbwstuttgart/typeinference/constraints/ConstraintSet.java b/src/main/java/de/dhbwstuttgart/typeinference/constraints/ConstraintSet.java
index f438c664..c3fc5520 100644
--- a/src/main/java/de/dhbwstuttgart/typeinference/constraints/ConstraintSet.java
+++ b/src/main/java/de/dhbwstuttgart/typeinference/constraints/ConstraintSet.java
@@ -71,7 +71,7 @@ public class ConstraintSet<A> {
         
         for(Set<Constraint<A>> oderConstraint : oderConstraints){
             newOder.add(
-                    oderConstraint.parallelStream().map((Constraint<A> as) -> {
+                    oderConstraint.stream().map((Constraint<A> as) -> {
                     	
                     	Constraint<B> newConst = as.stream()
                     			.map(o)
diff --git a/src/test/java/TestComplete.java b/src/test/java/TestComplete.java
index ff42eabc..b121f834 100644
--- a/src/test/java/TestComplete.java
+++ b/src/test/java/TestComplete.java
@@ -4,6 +4,7 @@ import org.junit.Ignore;
 import org.junit.Test;
 
 import java.lang.reflect.*;
+import java.util.AbstractList;
 import java.util.Arrays;
 import java.util.List;
 import java.util.Vector;
@@ -263,7 +264,7 @@ public class TestComplete {
 
         var instanceOfClass_m2 = matrix.getDeclaredConstructor(Vector.class).newInstance(vv1);
 
-        var mul = matrix.getDeclaredMethod("mul", Vector.class);
+        var mul = matrix.getDeclaredMethod("mul", List.class);
         var result = mul.invoke(instanceOfClass_m1, instanceOfClass_m2);
         System.out.println(instanceOfClass_m1.toString() + " * " + instanceOfClass_m2.toString() + " = " + result.toString());