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Pebble motion problems occur in domains such as multi-robot motion planning (in which the pebbles are robots) and network routing (in which the pebbles are packets of data). The best-known example of a pebble motion problem is the famous 15 puzzle where a disordered group of fifteen tiles must be rearranged within a 4x4 grid by sliding one tile ...
Graph pebbling is a mathematical game played on a graph with zero or more pebbles on each of its vertices. 'Game play' is composed of a series of pebbling moves. A pebbling move on a graph consists of choosing a vertex with at least two pebbles, removing two pebbles from it, and adding one to an adjacent vertex (the second removed pebble is discarded from play). π(G), the pebbling number of a ...
Pebble accretion is the accumulation of particles, ranging from centimeters up to meters in diameter, into planetesimals in a protoplanetary disk that is enhanced by aerodynamic drag from the gas present in the disk. This drag reduces the relative velocity of pebbles as they pass by larger bodies, preventing some from escaping the body's gravity.
A pebble path leaves the road about 1 kilometre (5 ⁄ 8 mi) west of the youth hostel, and passes a white house on the left, reaching the bealach between the Pap and Sgor nam Fiannaidh, from where the Pap may be climbed. The final stretch up to the bealach forms a pathway by small gully; this section is often extremely muddy and boggy.
Pebble tools are among the earliest known man-made artifacts, dating from the Palaeolithic period of human history. A beach composed chiefly of surface pebbles is commonly termed a shingle beach. This type of beach has armoring characteristics with respect to wave erosion, as well as ecological niches that provide habitat for animals and plants.
Competition, however, is fierce. Sometimes, there simply aren’t enough pebbles to go around. Biologists have observed Adélie penguins engaging in pebble thievery when times are tough.
Permeable pavement is commonly used on roads, paths and parking lots subject to light vehicular traffic, such as cycle-paths, service or emergency access lanes, road and airport shoulders, and residential sidewalks and driveways.
existence of Eulerian paths in a succinct graph; Bounded two-player Constraint Logic [11] Canadian traveller problem. [45] Determining whether routes selected by the Border Gateway Protocol will eventually converge to a stable state for a given set of path preferences [46] Deterministic constraint logic (unbounded) [47] Dynamic graph ...
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