Epsilon : 3e-13
FEEngine [
 + id                : my_fem
 + element dimension : 2
 + mesh [
  Mesh [
   + id                : mesh
   + spatial dimension : 2
   + nodes [
    Array<double> [
     + id             : mesh:coordinates
     + size           : 21
     + nb_component   : 2
     + allocated size : 2000
     + memory size    : 31.25KiByte
     + values         : {{0, 0}, {1, 0}, {1, 1}, {0, 1}, {0.5, 0}, {0.25, 0}, {0.75, 0}, {1, 0.5}, {1, 0.25}, {1, 0.75}, {0.5, 1}, {0.75, 1}, {0.25, 1}, {0, 0.5}, {0, 0.75}, {0, 0.25}, {0.5, 0.5}, {0.5, 0.75}, {0.75, 0.5}, {0.5, 0.25}, {0.25, 0.5}}
    ]
   + connectivities [
    ElementTypeMapArray<unsigned int> [
        (not_ghost:_quadrangle_8) [
       Array<unsigned int> [
        + id             : mesh:connectivities:_quadrangle_8
        + size           : 4
        + nb_component   : 8
        + allocated size : 2000
        + memory size    : 62.50KiByte
        + values         : {{2, 10, 16, 7, 11, 17, 18, 9}, {7, 16, 4, 1, 18, 19, 6, 8}, {10, 3, 13, 16, 12, 14, 20, 17}, {16, 13, 0, 4, 20, 15, 5, 19}}
       ]
         ]
    ]
   ]
   GroupManager [
   ]
  ]
 ]
]