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In graph-theoretic terms, the theorem states that for loopless planar graph, its chromatic number is ().. The intuitive statement of the four color theorem – "given any separation of a plane into contiguous regions, the regions can be colored using at most four colors so that no two adjacent regions have the same color" – needs to be interpreted appropriately to be correct.
See also: Flags of the U.S. states and territories A 2.00 m × 1.70 m oil painting showing historical US flags. This is a list of flags in the United States describing the evolution of the flag of the United States, as well as other flags used within the United States, such as the flags of governmental agencies. There are also separate flags for embassies and ships. National flags Main article ...
Washington does not have known official state colors. No official state colors are listed the state legislature's State Symbols webpage [40] nor in Chapter 1.20 of the Revised Code of Washington (where other official symbols are designated). [41] Some sources list dark green and gold/yellow, the two colors specified for the flag by law since ...
The flag is also a symbol of exploration. It was planted on the moon during the first landing by Apollo 11 astronauts in 1969. The flag even has its own day -- each year Americans celebrate flag ...
Colors white and gold, related to the two metals of European heraldry (argent and or) are sorted first. The five major colors of European heraldry (black, red, green, blue, and purple) are sorted next. Miscellaneous colors (murrey, tan, grey, and pink) are sorted last. Similar colors are grouped together to make navigation of this list practical.
1963 – American Flag placed on top of Mount Everest in the Himalayas in Nepal, by Barry Bishop. 1968 – Adoption of Federal Flag Desecration Law (18 U.S.C. 700 et seq.) – Congress approved the first federal flag desecration law in the wake of a highly publicized Central Park flag burning incident in New York City in protest of the Vietnam War.
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