5 #include "../detail/type_mat2x2.hpp" 
   15         typedef mat<2, 2, double, defaultp>             
dmat2x2;
 
   20         typedef mat<2, 2, double, defaultp>             
dmat2;
 
mat< 2, 2, double, defaultp > dmat2
2 columns of 2 components matrix of double-precision floating-point numbers. 
mat< 2, 2, double, defaultp > dmat2x2
2 columns of 2 components matrix of double-precision floating-point numbers.