Hans Walser, [20090629a] Puzzle Except the squares, all polygons can be filled by six kinds of tiles. The tiles have differ-ent shape, but equal area.

Hans Walser: Puzzle 2/6.. Grid may

You may fill the polygons by triangles of one size and shape and squares of three sizes.. The central hexagon is

The tiles have equal area... : Proof Without Words:

Although calls by some in Europe to cancel negotiations in the wake of the NSA affair did not succeed, European enthusiasm about the free trade area has cooled somewhat. One

Ceasefire/peace negotiations should therefore include representatives of the Assad regime, Syrian political opponents and armed rebels from the Free Syrian Army, and

The respect and prestige of scientist who manage to actually en- gage the general public in the USA (and other parts of the anglophone world) is seen evident in the likes of

However, Akiyama and Thuswaldner computed the neighbor graph for the class of planar self-affine lattice tiles (0.6) associated with canonical number systems and used it to

One can use the same method to verify, for instance, that AllD and GRIM are evo- lutionary stable rules (GRIM cooperates only if both players cooperated in the previous round. If