diff --git a/Source/Compatibility/Math/BezierCurve.cs b/Source/Compatibility/Math/BezierCurve.cs
index 11442250..19653c77 100644
--- a/Source/Compatibility/Math/BezierCurve.cs
+++ b/Source/Compatibility/Math/BezierCurve.cs
@@ -17,6 +17,7 @@ namespace OpenTK.Math
     /// <summary>
     /// Represents a bezier curve with as many points as you want.
     /// </summary>
+    [Obsolete("OpenTK.Math functions have been moved to the root OpenTK namespace (reason: XNA compatibility")]
     [Serializable]
     public struct BezierCurve
     {
diff --git a/Source/Compatibility/Math/BezierCurveCubic.cs b/Source/Compatibility/Math/BezierCurveCubic.cs
index 1491674b..ba56a4b1 100644
--- a/Source/Compatibility/Math/BezierCurveCubic.cs
+++ b/Source/Compatibility/Math/BezierCurveCubic.cs
@@ -17,6 +17,7 @@ namespace OpenTK.Math
     /// <summary>
     /// Represents a cubic bezier curve with two anchor and two control points.
     /// </summary>
+    [Obsolete("OpenTK.Math functions have been moved to the root OpenTK namespace (reason: XNA compatibility")]
     [Serializable]
     public struct BezierCurveCubic
     {
diff --git a/Source/Compatibility/Math/BezierCurveQuadric.cs b/Source/Compatibility/Math/BezierCurveQuadric.cs
index 0fd396c7..bb73e275 100644
--- a/Source/Compatibility/Math/BezierCurveQuadric.cs
+++ b/Source/Compatibility/Math/BezierCurveQuadric.cs
@@ -17,6 +17,7 @@ namespace OpenTK.Math
     /// <summary>
     /// Represents a quadric bezier curve with two anchor and one control point.
     /// </summary>
+    [Obsolete("OpenTK.Math functions have been moved to the root OpenTK namespace (reason: XNA compatibility")]
     [Serializable]
     public struct BezierCurveQuadric
     {
diff --git a/Source/Compatibility/Math/Box2.cs b/Source/Compatibility/Math/Box2.cs
index ae04a43f..739c733c 100644
--- a/Source/Compatibility/Math/Box2.cs
+++ b/Source/Compatibility/Math/Box2.cs
@@ -14,6 +14,7 @@ namespace OpenTK.Math
     /// <summary>
     /// Defines a 2d box (rectangle).
     /// </summary>
+    [Obsolete("OpenTK.Math functions have been moved to the root OpenTK namespace (reason: XNA compatibility")]
     [StructLayout(LayoutKind.Sequential)]
     public struct Box2
     {
diff --git a/Source/Compatibility/Math/Functions.cs b/Source/Compatibility/Math/Functions.cs
index 4c6058a3..1deee17a 100644
--- a/Source/Compatibility/Math/Functions.cs
+++ b/Source/Compatibility/Math/Functions.cs
@@ -17,6 +17,7 @@ namespace OpenTK.Math
     /// <summary>
     /// Contains mathematical functions for the OpenTK.Math toolkit.
     /// </summary>
+    [Obsolete("OpenTK.Math functions have been moved to the root OpenTK namespace (reason: XNA compatibility")]
     public static class Functions
     {
         #region public static long NextPowerOfTwo(long n)
diff --git a/Source/Compatibility/Math/Half.cs b/Source/Compatibility/Math/Half.cs
index c57ce2af..f55d4b4a 100644
--- a/Source/Compatibility/Math/Half.cs
+++ b/Source/Compatibility/Math/Half.cs
@@ -75,6 +75,7 @@ namespace OpenTK.Math
     /// but must not lead to GL interruption or termination. Providing a denormalized number or negative zero to GL must yield
     /// predictable results.
     /// </remarks>
+    [Obsolete("OpenTK.Math functions have been moved to the root OpenTK namespace (reason: XNA compatibility")]
     [Serializable, StructLayout(LayoutKind.Sequential)]
     public struct Half : ISerializable, IComparable<Half>, IFormattable, IEquatable<Half>
     {
diff --git a/Source/Compatibility/Math/Matrix3d.cs b/Source/Compatibility/Math/Matrix3d.cs
index febc35fd..e3702446 100644
--- a/Source/Compatibility/Math/Matrix3d.cs
+++ b/Source/Compatibility/Math/Matrix3d.cs
@@ -30,6 +30,7 @@ namespace OpenTK.Math
     // Todo: Remove this warning when the code goes public.
     #pragma warning disable 3019
 #if false
+    [Obsolete("OpenTK.Math functions have been moved to the root OpenTK namespace (reason: XNA compatibility")]
     [Serializable]
     [StructLayout(LayoutKind.Sequential)]
     public struct Matrix3d : IEquatable<Matrix3d>
@@ -219,7 +220,7 @@ namespace OpenTK.Math
 
         #endregion
 
-        #region Constructors
+    #region Constructors
 
         /// <summary>Constructs left matrix with the same components as the given matrix.</summary>
         /// <param name="vector">The matrix whose components to copy.</param>
@@ -318,7 +319,7 @@ namespace OpenTK.Math
 
         #endregion
 
-        #region Equality
+    #region Equality
 
         /// <summary>Indicates whether the current matrix is equal to another matrix.</summary>
         /// <param name="matrix">The OpenTK.Matrix3d structure to compare with.</param>
@@ -412,7 +413,7 @@ namespace OpenTK.Math
 
         #endregion
 
-        #region Arithmetic Operators
+    #region Arithmetic Operators
 
 
         /// <summary>Add left matrix to this matrix.</summary>
@@ -624,7 +625,7 @@ namespace OpenTK.Math
 
         #endregion
 
-        #region Functions
+    #region Functions
 
         public double Determinant
         {
@@ -667,7 +668,7 @@ namespace OpenTK.Math
 
         #endregion
 
-        #region Transformation Functions
+    #region Transformation Functions
 
         public void Transform(ref Vector3d vector)
         {
@@ -772,7 +773,7 @@ namespace OpenTK.Math
 
         #endregion
 
-        #region Constants
+    #region Constants
 
         /// <summary>The identity matrix.</summary>
         public static readonly Matrix3d Identity = new Matrix3d
@@ -792,7 +793,7 @@ namespace OpenTK.Math
 
         #endregion
 
-        #region HashCode
+    #region HashCode
 
         /// <summary>Returns the hash code for this instance.</summary>
         /// <returns>A 32-bit signed integer that is the hash code for this instance.</returns>
@@ -806,7 +807,7 @@ namespace OpenTK.Math
 
         #endregion
 
-        #region String
+    #region String
 
         /// <summary>Returns the fully qualified type name of this instance.</summary>
         /// <returns>A System.String containing left fully qualified type name.</returns>
@@ -824,5 +825,5 @@ namespace OpenTK.Math
         #endregion
     }
 #endif
-    #pragma warning restore 3019
+#pragma warning restore 3019
 }
diff --git a/Source/Compatibility/Math/Matrix4.cs b/Source/Compatibility/Math/Matrix4.cs
index 6cef4904..b15e37f5 100644
--- a/Source/Compatibility/Math/Matrix4.cs
+++ b/Source/Compatibility/Math/Matrix4.cs
@@ -30,6 +30,7 @@ namespace OpenTK.Math
     /// <summary>
     /// Represents a 4x4 Matrix
     /// </summary>
+    [Obsolete("OpenTK.Math functions have been moved to the root OpenTK namespace (reason: XNA compatibility")]
     [Serializable]
     [StructLayout(LayoutKind.Sequential)]
     public struct Matrix4 : IEquatable<Matrix4>
diff --git a/Source/Compatibility/Math/Matrix4d.cs b/Source/Compatibility/Math/Matrix4d.cs
index b8bafbca..132b25da 100644
--- a/Source/Compatibility/Math/Matrix4d.cs
+++ b/Source/Compatibility/Math/Matrix4d.cs
@@ -30,6 +30,7 @@ namespace OpenTK.Math
     /// <summary>
     /// Represents a 4x4 Matrix with double-precision components.
     /// </summary>
+    [Obsolete("OpenTK.Math functions have been moved to the root OpenTK namespace (reason: XNA compatibility")]
     [Serializable]
     [StructLayout(LayoutKind.Sequential)]
     public struct Matrix4d : IEquatable<Matrix4d>
diff --git a/Source/Compatibility/Math/Quaternion.cs b/Source/Compatibility/Math/Quaternion.cs
index b90a4d3f..84a8bf2f 100644
--- a/Source/Compatibility/Math/Quaternion.cs
+++ b/Source/Compatibility/Math/Quaternion.cs
@@ -32,6 +32,7 @@ namespace OpenTK.Math
     /// <summary>
     /// Represents a Quaternion.
     /// </summary>
+    [Obsolete("OpenTK.Math functions have been moved to the root OpenTK namespace (reason: XNA compatibility")]
     [Serializable]
     [StructLayout(LayoutKind.Sequential)]
     public struct Quaternion : IEquatable<Quaternion>
diff --git a/Source/Compatibility/Math/Quaterniond.cs b/Source/Compatibility/Math/Quaterniond.cs
index 6091c8b1..2597d616 100644
--- a/Source/Compatibility/Math/Quaterniond.cs
+++ b/Source/Compatibility/Math/Quaterniond.cs
@@ -32,6 +32,7 @@ namespace OpenTK.Math
     /// <summary>
     /// Represents a double-precision Quaternion.
     /// </summary>
+    [Obsolete("OpenTK.Math functions have been moved to the root OpenTK namespace (reason: XNA compatibility")]
     [Serializable]
     [StructLayout(LayoutKind.Sequential)]
     public struct Quaterniond : IEquatable<Quaterniond>
diff --git a/Source/Compatibility/Math/Vector2.cs b/Source/Compatibility/Math/Vector2.cs
index b5c6e050..c7fce060 100644
--- a/Source/Compatibility/Math/Vector2.cs
+++ b/Source/Compatibility/Math/Vector2.cs
@@ -31,6 +31,7 @@ namespace OpenTK.Math
     /// <remarks>
     /// The Vector2 structure is suitable for interoperation with unmanaged code requiring two consecutive floats.
     /// </remarks>
+    [Obsolete("OpenTK.Math functions have been moved to the root OpenTK namespace (reason: XNA compatibility")]
     [Serializable]
     [StructLayout(LayoutKind.Sequential)]
     public struct Vector2 : IEquatable<Vector2>
diff --git a/Source/Compatibility/Math/Vector2d.cs b/Source/Compatibility/Math/Vector2d.cs
index 07002727..1f53101c 100644
--- a/Source/Compatibility/Math/Vector2d.cs
+++ b/Source/Compatibility/Math/Vector2d.cs
@@ -28,6 +28,7 @@ using System.Runtime.InteropServices;
 namespace OpenTK.Math
 {
     /// <summary>Represents a 2D vector using two double-precision floating-point numbers.</summary>
+    [Obsolete("OpenTK.Math functions have been moved to the root OpenTK namespace (reason: XNA compatibility")]
     [Serializable]
     [StructLayout(LayoutKind.Sequential)]
     public struct Vector2d : IEquatable<Vector2d>
diff --git a/Source/Compatibility/Math/Vector2h.cs b/Source/Compatibility/Math/Vector2h.cs
index d8600703..29b0b986 100644
--- a/Source/Compatibility/Math/Vector2h.cs
+++ b/Source/Compatibility/Math/Vector2h.cs
@@ -31,6 +31,7 @@ namespace OpenTK.Math
 {
 
     /// <summary>2-component Vector of the Half type. Occupies 4 Byte total.</summary>
+    [Obsolete("OpenTK.Math functions have been moved to the root OpenTK namespace (reason: XNA compatibility")]
     [Serializable, StructLayout(LayoutKind.Sequential)]
     public struct Vector2h : ISerializable, IEquatable<Vector2h>
     {
diff --git a/Source/Compatibility/Math/Vector3.cs b/Source/Compatibility/Math/Vector3.cs
index 66fb5c50..e670b520 100644
--- a/Source/Compatibility/Math/Vector3.cs
+++ b/Source/Compatibility/Math/Vector3.cs
@@ -34,6 +34,7 @@ namespace OpenTK.Math
     /// <remarks>
     /// The Vector3 structure is suitable for interoperation with unmanaged code requiring three consecutive floats.
     /// </remarks>
+    [Obsolete("OpenTK.Math functions have been moved to the root OpenTK namespace (reason: XNA compatibility")]
     [Serializable]
     [StructLayout(LayoutKind.Sequential)]
     public struct Vector3 : IEquatable<Vector3>
diff --git a/Source/Compatibility/Math/Vector3d.cs b/Source/Compatibility/Math/Vector3d.cs
index 25e528ba..989f8b93 100644
--- a/Source/Compatibility/Math/Vector3d.cs
+++ b/Source/Compatibility/Math/Vector3d.cs
@@ -31,6 +31,7 @@ namespace OpenTK.Math
     /// <summary>
     /// Represents a 3D vector using three double-precision floating-point numbers.
     /// </summary>
+    [Obsolete("OpenTK.Math functions have been moved to the root OpenTK namespace (reason: XNA compatibility")]
     [Serializable]
     [StructLayout(LayoutKind.Sequential)]
     public struct Vector3d : IEquatable<Vector3d>
diff --git a/Source/Compatibility/Math/Vector3h.cs b/Source/Compatibility/Math/Vector3h.cs
index f3dd7528..f1616267 100644
--- a/Source/Compatibility/Math/Vector3h.cs
+++ b/Source/Compatibility/Math/Vector3h.cs
@@ -33,6 +33,7 @@ namespace OpenTK.Math
     /// <summary>
     /// 3-component Vector of the Half type. Occupies 6 Byte total.
     /// </summary>
+    [Obsolete("OpenTK.Math functions have been moved to the root OpenTK namespace (reason: XNA compatibility")]
     [Serializable, StructLayout(LayoutKind.Sequential)]
     public struct Vector3h : ISerializable, IEquatable<Vector3h>
     {
diff --git a/Source/Compatibility/Math/Vector4.cs b/Source/Compatibility/Math/Vector4.cs
index de8440a1..2810581f 100644
--- a/Source/Compatibility/Math/Vector4.cs
+++ b/Source/Compatibility/Math/Vector4.cs
@@ -32,6 +32,7 @@ namespace OpenTK.Math
     /// <remarks>
     /// The Vector4 structure is suitable for interoperation with unmanaged code requiring four consecutive floats.
     /// </remarks>
+    [Obsolete("OpenTK.Math functions have been moved to the root OpenTK namespace (reason: XNA compatibility")]
     [Serializable]
     [StructLayout(LayoutKind.Sequential)]
     public struct Vector4 : IEquatable<Vector4>
diff --git a/Source/Compatibility/Math/Vector4d.cs b/Source/Compatibility/Math/Vector4d.cs
index 5be468c3..cdd0bf9d 100644
--- a/Source/Compatibility/Math/Vector4d.cs
+++ b/Source/Compatibility/Math/Vector4d.cs
@@ -29,6 +29,7 @@ using System.Xml.Serialization;
 namespace OpenTK.Math
 {
     /// <summary>Represents a 4D vector using four double-precision floating-point numbers.</summary>
+    [Obsolete("OpenTK.Math functions have been moved to the root OpenTK namespace (reason: XNA compatibility")]
     [Serializable]
     [StructLayout(LayoutKind.Sequential)]
     public struct Vector4d : IEquatable<Vector4d>
diff --git a/Source/Compatibility/Math/Vector4h.cs b/Source/Compatibility/Math/Vector4h.cs
index 6a88866a..0045e45f 100644
--- a/Source/Compatibility/Math/Vector4h.cs
+++ b/Source/Compatibility/Math/Vector4h.cs
@@ -33,6 +33,7 @@ namespace OpenTK.Math
     /// <summary>
     /// 4-component Vector of the Half type. Occupies 8 Byte total.
     /// </summary>
+    [Obsolete("OpenTK.Math functions have been moved to the root OpenTK namespace (reason: XNA compatibility")]
     [Serializable, StructLayout(LayoutKind.Sequential)]
     public struct Vector4h : ISerializable, IEquatable<Vector4h>
     {