Hexagon has no degrees of freedom but can seen as directed edges. Hexagons of symmetry g2, i4, and r12, as parallelogons can tessellate the Euclidean plane by translation. Other hexagon shapes can tile the plane with different orientations. The 6 roots of the simple Lie group , represented by a Dynkin diagram , are in a regular hexagonal pattern. The two simple roots have a 120° angle between them. The 12 roots of the Exceptional Lie group G2, represented by a Dynkin diagram are also in a hexagonal pattern. The two simple roots of two lengths have a 150° angle between
A Plane Is Born of paint and Mark applies the decals to make it unique. Finally it is the turn of Tony Palmer to show us his own pride and joy - his Avid Speedwing. - Up, Up & Away! The final episode in the series sees the newly built plane go through the final checks it needs for its certificate of air-worthiness. Will it pass and can Mark finally realise his dream to fly his very own aeroplane? A Plane Is Born A Plane is Born, presented by Mark Evans, was a 15 part series for Discovery Home and Leisure (now Discovery Real