diff --git a/src/Numerics/Compatibility.cs b/src/Numerics/Compatibility.cs
index 2294cc15..680dd790 100644
--- a/src/Numerics/Compatibility.cs
+++ b/src/Numerics/Compatibility.cs
@@ -334,36 +334,3 @@ namespace MathNet.Numerics
     }
 }
 #endif
-
-#if NETSTANDARD1_6
-namespace MathNet.Numerics
-{
-    public interface ICloneable
-
-    {
-        object Clone();
-    }
-}
-#endif
-
-#if NETSTANDARD1_6
-namespace MathNet.Numerics
-{
-    using System;
-
-    public static class MathExtensions
-    {
-        public static int DivRem(int a, int b, out int result)
-        {
-            result = a/b;
-            return a%b;
-        }
-
-        public static long DivRem(long a, long b, out long result)
-        {
-            result = a/b;
-            return a%b;
-        }
-    }
-}
-#endif
diff --git a/src/Numerics/ComplexExtensions.cs b/src/Numerics/ComplexExtensions.cs
index 77eddc23..b2ba2970 100644
--- a/src/Numerics/ComplexExtensions.cs
+++ b/src/Numerics/ComplexExtensions.cs
@@ -32,7 +32,7 @@ namespace MathNet.Numerics
     using System;
     using System.Collections.Generic;
 
-#if !PORTABLE || NETSTANDARD1_6
+#if !PORTABLE && !NETSTANDARD1_6
     using System.Runtime;
 #endif
 
diff --git a/src/Numerics/LinearAlgebra/Matrix.Arithmetic.cs b/src/Numerics/LinearAlgebra/Matrix.Arithmetic.cs
index 355311f1..793113a2 100644
--- a/src/Numerics/LinearAlgebra/Matrix.Arithmetic.cs
+++ b/src/Numerics/LinearAlgebra/Matrix.Arithmetic.cs
@@ -36,7 +36,7 @@ namespace MathNet.Numerics.LinearAlgebra
     /// <summary>
     /// Defines the base class for <c>Matrix</c> classes.
     /// </summary>
-    public abstract partial class Matrix<T> : ICloneable
+    public abstract partial class Matrix<T>
     {
         /// <summary>
         /// The value of 1.0.
diff --git a/src/Numerics/LinearAlgebra/Matrix.BCL.cs b/src/Numerics/LinearAlgebra/Matrix.BCL.cs
index 9c689109..b8c6bf57 100644
--- a/src/Numerics/LinearAlgebra/Matrix.BCL.cs
+++ b/src/Numerics/LinearAlgebra/Matrix.BCL.cs
@@ -37,7 +37,7 @@ namespace MathNet.Numerics.LinearAlgebra
 {
     [DebuggerDisplay("Matrix {RowCount}x{ColumnCount}")]
 
-    public abstract partial class Matrix<T> : ICloneable
+    public abstract partial class Matrix<T>
     {
         /// <summary>
         /// Indicates whether the current object is equal to another object of the same type.
@@ -77,21 +77,19 @@ namespace MathNet.Numerics.LinearAlgebra
             return Storage.GetHashCode();
         }
 
-#if !PORTABLE
+#if !PORTABLE && !NETSTANDARD1_6
 
         /// <summary>
         /// Creates a new object that is a copy of the current instance.
         /// </summary>
         /// <returns>
         /// A new object that is a copy of this instance.
-        /// </returns>
-        /// 
+        /// </returns> 
         object ICloneable.Clone()
         {
             return Clone();
         }
 
-
 #endif
 
         /// <summary>
diff --git a/src/Numerics/LinearAlgebra/Matrix.Operators.cs b/src/Numerics/LinearAlgebra/Matrix.Operators.cs
index 0979bac1..ee19f15c 100644
--- a/src/Numerics/LinearAlgebra/Matrix.Operators.cs
+++ b/src/Numerics/LinearAlgebra/Matrix.Operators.cs
@@ -35,7 +35,7 @@ namespace MathNet.Numerics.LinearAlgebra
     /// <summary>
     /// Defines the base class for <c>Matrix</c> classes.
     /// </summary>
-    public abstract partial class Matrix<T> : ICloneable
+    public abstract partial class Matrix<T>
     {
         /// <summary>
         /// Returns a <strong>Matrix</strong> containing the same values of <paramref name="rightSide"/>.
diff --git a/src/Numerics/LinearAlgebra/Matrix.Solve.cs b/src/Numerics/LinearAlgebra/Matrix.Solve.cs
index e3e353fa..e46f6d64 100644
--- a/src/Numerics/LinearAlgebra/Matrix.Solve.cs
+++ b/src/Numerics/LinearAlgebra/Matrix.Solve.cs
@@ -36,7 +36,7 @@ namespace MathNet.Numerics.LinearAlgebra
     /// <summary>
     /// Defines the base class for <c>Matrix</c> classes.
     /// </summary>
-    public abstract partial class Matrix<T> : ICloneable
+    public abstract partial class Matrix<T>
     {
 
         // Factorizations
diff --git a/src/Numerics/LinearAlgebra/Matrix.cs b/src/Numerics/LinearAlgebra/Matrix.cs
index a42bc3ef..e3606f52 100644
--- a/src/Numerics/LinearAlgebra/Matrix.cs
+++ b/src/Numerics/LinearAlgebra/Matrix.cs
@@ -44,7 +44,7 @@ namespace MathNet.Numerics.LinearAlgebra
     [Serializable]
     public abstract partial class Matrix<T> :
         IFormattable, IEquatable<Matrix<T>>
-#if PORTABLE || NET461
+#if !PORTABLE && !NETSTANDARD1_6
         , ICloneable
 #endif
         where T : struct, IEquatable<T>, IFormattable
diff --git a/src/Numerics/LinearAlgebra/Vector.BCL.cs b/src/Numerics/LinearAlgebra/Vector.BCL.cs
index f7cdd553..8e4c1702 100644
--- a/src/Numerics/LinearAlgebra/Vector.BCL.cs
+++ b/src/Numerics/LinearAlgebra/Vector.BCL.cs
@@ -77,7 +77,7 @@ namespace MathNet.Numerics.LinearAlgebra
             return Storage.GetHashCode();
         }
 
-#if !PORTABLE
+#if !PORTABLE && !NETSTANDARD1_6
 
         /// <summary>
         /// Creates a new object that is a copy of the current instance.
diff --git a/src/Numerics/LinearAlgebra/Vector.cs b/src/Numerics/LinearAlgebra/Vector.cs
index b7a4b780..acfeed0a 100644
--- a/src/Numerics/LinearAlgebra/Vector.cs
+++ b/src/Numerics/LinearAlgebra/Vector.cs
@@ -43,7 +43,7 @@ namespace MathNet.Numerics.LinearAlgebra
     [Serializable]
     public abstract partial class Vector<T> :
         IFormattable, IEquatable<Vector<T>>, IList, IList<T>
-#if !PORTABLE
+#if !PORTABLE && !NETSTANDARD1_6
         , ICloneable
 #endif
         where T : struct, IEquatable<T>, IFormattable
diff --git a/src/Numerics/Statistics/Histogram.cs b/src/Numerics/Statistics/Histogram.cs
index 6585fc90..6b603911 100644
--- a/src/Numerics/Statistics/Histogram.cs
+++ b/src/Numerics/Statistics/Histogram.cs
@@ -48,7 +48,7 @@ namespace MathNet.Numerics.Statistics
     [Serializable]
     [DataContract(Namespace = "urn:MathNet/Numerics")]
     public class Bucket :
-#if PORTABLE
+#if PORTABLE || NETSTANDARD1_6
    IComparable<Bucket>
 #else
     IComparable<Bucket>, ICloneable