due to memory layout being critical

/// <summary>Multiplies a matrix by another matrix.</summary>
/// <param name="value1">The first source matrix.</param>
/// <param name="value2">The second source matrix.</param>
/// <returns>The result of the multiplication.</returns>
public static unsafe Matrix2x3<T> operator *(Matrix2x3<T> value1, Matrix2x3<T> value2)
{
    Matrix2x3<T> m;

    // First row
    m.M11 = Operations.Add(Operations.Add(Operations.Multiply(value1.M11, value2.M11), Operations.Multiply(value1.M12, value2.M21)), value1.M13);
    m.M12 = Operations.Add(Operations.Add(Operations.Multiply(value1.M11, value2.M12), Operations.Multiply(value1.M12, value2.M22)), value1.M13);
    m.M13 = Operations.Add(Operations.Add(Operations.Multiply(value1.M11, value2.M13), Operations.Multiply(value1.M12, value2.M23)), value1.M13);

    // Second row
    m.M21 = Operations.Add(Operations.Add(Operations.Multiply(value1.M21, value2.M11), Operations.Multiply(value1.M22, value2.M21)), value1.M23);
    m.M22 = Operations.Add(Operations.Add(Operations.Multiply(value1.M21, value2.M12), Operations.Multiply(value1.M22, value2.M22)), value1.M23);
    m.M23 = Operations.Add(Operations.Add(Operations.Multiply(value1.M21, value2.M13), Operations.Multiply(value1.M22, value2.M23)), value1.M23);
    return m;
}