Functional recursive solution for calculating matrix determinant

determinant.cs

private double det(IEnumerable<IEnumerable<double>> matrix)
{
  return
    matrix.Any()
    ?
      matrix
      .Select((row, i) =>
        (i % 2 == 0 ? +1 : -1)
        * row.First()
        * det(matrix.Where((curRow, curI) => curI != i).Select(curRow => curRow.Skip(1)))
      )
      .Sum()
    : 1;
}