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It has 104 edges and 52 vertices and is currently the smallest known example of a 4-regular matchstick graph. [3] It is a rigid graph. [4] Every 4-regular matchstick graph contains at least 20 vertices. [5] Examples of 4-regular matchstick graphs are currently known for all number of vertices ≥ 52 except for 53, 55, 56, 58, 59, 61 and 62.
207 is a Wedderburn-Etherington number. [1] There are exactly 207 different matchstick graphs with eight edges. [2] [3] 207 is a deficient number, as 207's proper divisors (divisors not including the number itself) only add up to 105: + + + + = <.
Every matchstick graph is a planar graph, [14] but some otherwise-planar unit distance graphs (such as the Moser spindle) have a crossing in every representation as a unit distance graph. Additionally, in the context of unit distance graphs, the term 'planar' should be used with care, as some authors use it to refer to the plane in which the ...
State Route 411 (SR 411) begins at a partial cloverleaf interchange with SR 432 in Longview, located northwest of the confluence of the Cowlitz and Columbia rivers. [3] From the interchange, the highway travels north as 3rd Avenue to exit Longview and enter Kelso as First Avenue, [1] where SR 411 Spur extends west from the main roadway to SR 4, which the road goes under after SR 4 travels ...
The National Register recognizes places of national, state, or local historic significance across the United States. [1] Out of over 90,000 National Register sites nationwide, [ 2 ] Washington is home to approximately 1,500, [ 3 ] and 32 of those are found partially or wholly in Cowlitz County.
Kelso is a city in the southwestern part of the U.S. state of Washington and is the county seat of Cowlitz County. [5] At the 2020 census, the population was 12,720. [4] Kelso is part of the Longview, Washington Metropolitan statistical area, which has a population of 110,730. Kelso shares its long western border with Longview. It is near Mount ...
Carrolls is an unincorporated community in Cowlitz County, Washington, south of the city of Kelso. Carrolls is located south on Old Pacific Highway from exit 36 of Interstate 5 . The Carrolls community is part of the Kelso School District , a K-12 school district of nearly 5,000 students.
Rose Valley is an unincorporated community in Cowlitz County, Washington, southeast of the city of Kelso. Rose Valley is located south on Old Pacific Highway from exit 36 of Interstate 5, then east on Rose Valley Road. The Rose Valley community is part of the Kelso School District, a K-12 school district of nearly 5,000 students.