diff --git a/src/core/include/pw/core/matrixbase.hpp b/src/core/include/pw/core/matrixbase.hpp
index d5608c5..402b631 100644
--- a/src/core/include/pw/core/matrixbase.hpp
+++ b/src/core/include/pw/core/matrixbase.hpp
@@ -31,9 +31,9 @@
 #include <utility>
 #include <initializer_list>
 
-namespace pw {
+#include <iostream>
 
-// http://coliru.stacked-crooked.com/a/34db679ee8c13a80
+namespace pw {
 
 template <typename T, typename Derived>
 struct matrixbase_ {
@@ -97,6 +97,14 @@ struct matrix_ : matrixbase_<T, matrix_<T, R, C>> {
         return *this;
     }
 
+	template <typename... Arguments>
+	matrix_(Arguments ...values)
+		: data {values... }
+	{
+		static_assert(sizeof...(Arguments) == R*C,
+						"Incorrect number of arguments");
+	}
+
     //! rows
     inline std::size_t rows() const { return R; }
 
@@ -106,7 +114,7 @@ struct matrix_ : matrixbase_<T, matrix_<T, R, C>> {
     //! get cell count
     inline std::size_t coefficients() const { return R * C; }
 
-    inline size_t offset(int r,int c) const {
+	inline size_t offset(size_t r,size_t c) const {
         return (RowMajor) ? r * C + c : c * R + r;
     }
 
@@ -146,11 +154,33 @@ struct matrix_ : matrixbase_<T, matrix_<T, R, C>> {
         return *this;
     }
 
+
+	template<std::size_t Rs,std::size_t Cs,bool RowMajorSlice = RowMajor>
+	matrix_<T,Rs,Cs,RowMajorSlice> minor(std::size_t r0,std::size_t c0)  const
+	{
+		matrix_<T,Rs,Cs,RowMajorSlice> m;
+		size_t r = 0;
+		for (size_t ri = 0; ri < R; ri++) {
+			size_t c = 0;
+			if (ri == r0)
+				continue;
+			for (size_t ci = 0; ci < C; ci++)
+			{
+				if (ci == c0)
+					continue;
+				m(r,c) = (*this)(ri,ci);
+				c++;
+			}
+			r++;
+		}
+		return m;
+	}
+
     T determinant() const {
         T det(0);
-        for (size_t c = 0; c < C; c++) {
-            det += ((c % 2 == 0) ? (*this)(0,c) : -(*this)(0,c)) *  this->slice<R-1,C-1>(0,c).determinant();
-        }
+		for (size_t c = 0; c < C; c++)
+			det += ((c % 2 == 0) ? (*this)(0,c) : -(*this)(0,c))
+					* this->minor<R-1,C-1,RowMajor>(0,c).determinant();
         return det;
     }
 
@@ -162,21 +192,17 @@ struct matrix_ : matrixbase_<T, matrix_<T, R, C>> {
         return res;
     }
 
-    matrix_ inverse() const
-    {
-        matrix_ resMat;
-
-        for ( unsigned int r = 0; r < C; ++r) {
-            for ( unsigned int j = 0; j < R; ++j) {
-                short sgn = ((r+j)%2) ? -1 : 1;
-                auto minor = this->slice<R-1,C-1>(r,j);
-                resMat(r,j) = minor.determinant() * sgn;
-            }
-        }
-
-        resMat = resMat.transposed();
-        resMat *= T(1)/this->determinant();
-        return resMat;
+	matrix_<T,C,R,RowMajor> inverse() const {
+		T invDet = T(1) / this->determinant();
+		matrix_<T,C,R,RowMajor> inv;
+		for (int j = 0; j < C; j++)
+			for (int i = 0; i < R; i++)
+			{
+				const T minorDet = this->minor<R-1,C-1,RowMajor>(j,i).determinant();
+				const T coFactor = ((i + j) % 2 == 1) ? -minorDet : minorDet;
+				inv(i, j) = invDet * coFactor;
+			}
+		return inv;
     }
 
     inline bool row_major() const {
@@ -190,23 +216,48 @@ struct matrix_ : matrixbase_<T, matrix_<T, R, C>> {
 template <> inline
 float matrix_<float,1,1>::determinant() const
 {
-    return (*this)[0];
+	return (*this)(0,0);
 }
 
 template <> inline
 double matrix_<double,1,1>::determinant() const
 {
-    return (*this)[0];
+	return (*this)(0,0);
 }
 
 
+template <typename T, std::size_t R, std::size_t Ca,std::size_t Cb>
+auto operator * (const matrix_<T, R, Ca>& A,
+				 const matrix_<T, R, Cb>& B
+				 )
+{
+	matrix_<T,R,Cb> result; result.zero(); // zero the output
+	for (size_t r = 0; r < R; r++)
+		for (size_t c = 0; c < Cb; c++)
+			for (size_t iI = 0; iI < R; iI++)
+				result(r,c) += A(r,iI) * B(iI,c); // inner product
+	return result;
+}
+
+//
+//
+//
+
 template <typename T, std::size_t N,bool RowMajor = false>
 struct vector_ : matrix_<T, N, 1, RowMajor>
 {
     typedef matrix_<T, N, 1, RowMajor> derived_type;
 
+	vector_() = default;
     vector_(const derived_type& rhs) : derived_type(rhs) {}
 
+	template <typename... Arguments>
+	vector_(Arguments ...values)
+		: derived_type( { values...} )
+	{
+		static_assert(sizeof...(Arguments) == N,
+						"Incorrect number of arguments");
+	}
 };
 
 template <typename T, typename U, std::size_t N,bool RowMajor = false>
@@ -233,9 +284,14 @@ auto dot(const vector_<T, N, RowMajor>& a, const vector_<U, N, RowMajor>& b)
 //
 
 template <typename T> using matrix2x2_ = matrix_<T, 2, 2>;
+template <typename T> using matrix3x3_ = matrix_<T, 3, 3>;
+template <typename T> using matrix4x4_ = matrix_<T, 4, 4>;
+
 using matrix2x2f = matrix_<float, 2, 2>;
 
 template <typename T> using vector2_ = vector_<T, 2>;
+template <typename T> using vector3_ = vector_<T, 3>;
+template <typename T> using vector4_ = vector_<T, 4>;
 using vector2f = vector2_<float>;
 
 
diff --git a/src/core/tests/pwcore_test_matrix.cpp b/src/core/tests/pwcore_test_matrix.cpp
index 885db41..ae063fc 100644
--- a/src/core/tests/pwcore_test_matrix.cpp
+++ b/src/core/tests/pwcore_test_matrix.cpp
@@ -7,21 +7,64 @@
 #include <pw/core/debug.hpp>
 
 #include <iostream>
+#include <sstream>
+
+template <typename T_,typename O_,size_t R,size_t C> inline static
+std::basic_ostream<O_>& operator << (std::basic_ostream<O_>& os,
+									 const pw::matrix_<T_,R,C>& m
+									 )
+{
+	for (size_t r = 0; r < R;r++){
+		for (size_t c = 0;c < C;c++) {
+			os << m(r,c) << " ";
+		}
+		os << std::endl;
+	}
+	return os;
+}
 
 int main(int argc,char **argv) {
 
-
     using namespace pw;
 
     matrix2x2f m22; m22.zero();
 
+
     m22(0,0) = 1; m22(0,1) = 2;
     m22(1,0) = 3; m22(1,1) = 4;
 
+	vector2f v2;
+	v2[0] = 1; v2[1] = 3;
+
+	vector2f v3(1.f,2.f);
+
+	auto m22_inv = m22.inverse();
+	auto m22_id = m22_inv * m22;
+
+	auto v2_t = m22_id * v2;
+	auto v3_t = m22_id * v3;
+
+
+
+	auto v2_f = m22 * v2;
+	auto v2_b = m22_inv * v2_f;
+
 
     debug::d() << "offset(0,1) col-major " << m22.offset(0,1);
     debug::d() << "det " << m22.determinant();
 
+	std::cout << "m22 " << m22 << std::endl;
+	std::cout << "m22-1 " << m22_inv << std::endl;
+	std::cout << "m22-i " << m22_id << std::endl;
+	std::cout << "v22_t " << v2_t << std::endl;
+	std::cout << "v3_t " << v3_t << std::endl;
+
+	std::cout << "v2_f " << v2_f << std::endl;
+	std::cout << "v2_b " << v2_b << std::endl;
+
+
+
+
 //    vector2f v2 = m22.slice<2,1>(0,0);
 //    m22.set_slice<2,1>(v2,0,0);