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The empty graph E 3 (red) admits a 1-coloring; the complete graph K 3 (blue) admits a 3-coloring; the other graphs admit a 2-coloring. Main article: Chromatic polynomial The chromatic polynomial counts the number of ways a graph can be colored using some of a given number of colors.
In statistics, the Kendall rank correlation coefficient, commonly referred to as Kendall's τ coefficient (after the Greek letter τ, tau), is a statistic used to measure the ordinal association between two measured quantities.
Linear or point-projection perspective works by putting an imaginary flat plane that is close to an object under observation and directly facing an observer's eyes (i.e., the observer is on a normal, or perpendicular line to the plane).
3-Hydroxyflavone is a chemical compound. It is the backbone of all flavonols, a type of flavonoid.It is a synthetic compound, which is not found naturally in plants. It serves as a model molecule as it possesses an excited-state intramolecular proton transfer (ESIPT) effect [1] to serve as a fluorescent probe to study membranes for example [2] or intermembrane proteins. [3]
According to early Spanish articles, the Lima area was once called Itchyma, [citation needed] after its original inhabitants. However, even before the Inca occupation of the area in the 15th century, a famous oracle in the Rímac Valley had come to be known by visitors as Limaq (Limaq, pronounced , which means "talker" or "speaker" in the coastal Quechua that was the area's primary language ...