Crossing
121Crossing number (graph theory) — A drawing of the Heawood graph with three crossings. This is the minimum number of crossings among all drawings of this graph, so the graph has crossing number cr(G) = 3. In graph theory, the crossing number cr(G) of a graph G is the… …
122Crossing sweeper — For the William Powell Frith painting, see The Crossing Sweeper. The Crossing Sweeper by William Powell Frith, 1858. A crossing sweeper was a person who would sweep a path ahead of people crossing dirty urban streets in exchange for a gratuity.… …
123Crossing pylon — A crossing pylon is an electricity pylon for a crossing of an overhead line crossing over a body of water, or a valley.In order to allow ships passing underneath, crossing pylons across wide rivers and sea straits are frequently taller than… …
124Crossing the inner German border — Crossing points on the inner German border, 1982[1] Crossing the i …
125Crossing guard — Lollipop man redirects here. For the Formula One pit crew member, see Pit stop#F1 pit crew roles. For the Sean Penn film, see The Crossing Guard. A London lollipop lady with St. Paul s Cathedral in the background A crossing guard (United States a …
126Crossing of cheques — A crossed cheque – the oblique nearly vertical lines down the center are the cross. Any cheque crossed with two parallel lines means that the cheque can only be deposited directly into an account with a bank and cannot be immediately cashed by a… …
127Crossing number (knot theory) — In the mathematical area of knot theory, the crossing number of a knot is the minimal number of crossings of any diagram of the knot. It is a knot invariant. By way of example, the unknot has crossing number zero, the trefoil knot three and the… …
128Crossing (architecture) — Cathedral floor plan (crossing is shaded) A crossing, in ecclesiastical architecture, is the junction of the four arms of a cruciform (cross shaped) church. In a typically oriented church (especially of Romanesque and Gothic styles), the crossing …
