diff --git a/src/Geometry/Mesh.cs b/src/Geometry/Mesh.cs
index a8d1b7a..1387186 100644
--- a/src/Geometry/Mesh.cs
+++ b/src/Geometry/Mesh.cs
@@ -1,6 +1,5 @@
 using System;
 using System.Collections.Generic;
-using Paramdigma.Core.Geometry;
 
 namespace Paramdigma.Core.Geometry
 {
diff --git a/src/Geometry/MeshFace.cs b/src/Geometry/MeshFace.cs
index 5db11c3..35c3c63 100644
--- a/src/Geometry/MeshFace.cs
+++ b/src/Geometry/MeshFace.cs
@@ -1,5 +1,4 @@
 using System.Collections.Generic;
-using Paramdigma.Core.Geometry;
 
 namespace Paramdigma.Core.Geometry
 {
diff --git a/src/Geometry/MeshPoint.cs b/src/Geometry/MeshPoint.cs
index 1f3efcc..eec286c 100644
--- a/src/Geometry/MeshPoint.cs
+++ b/src/Geometry/MeshPoint.cs
@@ -1,5 +1,3 @@
-using Paramdigma.Core.Geometry;
-
 namespace Paramdigma.Core.Geometry
 {
     /// <summary>
diff --git a/src/Geometry/MeshVertex.cs b/src/Geometry/MeshVertex.cs
index 9e0736b..dfd4ed2 100644
--- a/src/Geometry/MeshVertex.cs
+++ b/src/Geometry/MeshVertex.cs
@@ -1,6 +1,5 @@
 using System.Collections.Generic;
 using System.Linq;
-using Paramdigma.Core.Geometry;
 
 namespace Paramdigma.Core.Geometry
 {
diff --git a/src/Geometry/Point3d.cs b/src/Geometry/Point3d.cs
index 862b917..a89498f 100644
--- a/src/Geometry/Point3d.cs
+++ b/src/Geometry/Point3d.cs
@@ -84,14 +84,6 @@ public double DistanceTo(Point3d point) => Math.Sqrt(
                                           + Math.Pow(point.Z - this.Z, 2));
 
 
-        /// <inheritdoc />
-        public override bool Equals(object obj) => base.Equals(obj);
-
-
-        /// <inheritdoc />
-        public override int GetHashCode() => base.GetHashCode();
-
-
         /// <inheritdoc />
         public override string ToString() => "Point3d" + base.ToString();
 
diff --git a/src/Geometry/Polyline2d.cs b/src/Geometry/Polyline2d.cs
index 62dbc1f..2c0bdf0 100644
--- a/src/Geometry/Polyline2d.cs
+++ b/src/Geometry/Polyline2d.cs
@@ -13,7 +13,7 @@ public class Polyline2d
         private bool isClosed;
         private List<Line2d> segments;
         private bool segmentsNeedUpdate;
-        private List<Point2d> vertices;
+        private readonly List<Point2d> vertices;
 
 
         /// <summary>
@@ -26,7 +26,8 @@ public Polyline2d(List<Point2d> vertices, bool closed)
             this.vertices = vertices;
             this.IsClosed =
                 closed; // Call the property (not the field), to have if add the first point at the end if necessary.
-            this.RebuildSegments();
+            
+            this.segmentsNeedUpdate = this.RebuildSegments();
         }
 
 
@@ -45,7 +46,7 @@ public List<Line2d> Segments
             get
             {
                 if (this.segmentsNeedUpdate)
-                    this.RebuildSegments();
+                    this.segmentsNeedUpdate = this.RebuildSegments();
                 return this.segments;
             }
         }
@@ -196,7 +197,7 @@ public void Reparametrize()
         }
 
 
-        private void RebuildSegments()
+        private bool RebuildSegments()
         {
             this.segments = new List<Line2d>();
             double currentParam = 0;
@@ -209,6 +210,7 @@ private void RebuildSegments()
             }
 
             this.domain = new Interval(0, currentParam);
+            return false;
         }