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Selection principle. In mathematics, a selection principle is a rule asserting the possibility of obtaining mathematically significant objects by selecting elements from given sequences of sets. The theory of selection principles studies these principles and their relations to other mathematical properties.
instead. In developing the analogue for the complex logarithm, there is an additional complication: the definition of the complex integral requires a choice of path. . Fortunately, if the integrand is holomorphic, then the value of the integral is unchanged by deforming the path (while holding the endpoints fixed), and in a simply connected region (a region with "no holes"), any path from to ...
The rule of mutual exclusion in molecular spectroscopy relates the observation of molecular vibrations to molecular symmetry. It states that no normal modes can be both Infrared and Raman active in a molecule that possesses a center of symmetry. This is a powerful application of group theory to vibrational spectroscopy, and allows one to easily ...
Early life. O'Hara was born in Washington, D.C. He moved with his parents to Michigan in 1939 and graduated from University of Detroit High School in 1943. During the Second World War, he served as an enlisted man in the United States Army with Company B, 511th Parachute Infantry Regiment, U.S. 11th Airborne Division, seeing action in the Pacific Theater of Operations.
Group selection is a proposed mechanism of evolution in which natural selection acts at the level of the group, instead of at the level of the individual or gene. Early authors such as V. C. Wynne-Edwards and Konrad Lorenz argued that the behavior of animals could affect their survival and reproduction as groups, speaking for instance of ...
Wilson himself compared his model to such a set. A unit of selection is a biological entity within the hierarchy of biological organization (for example, an entity such as: a self-replicating molecule, a gene, a cell, an organism, a group, or a species) that is subject to natural selection. There is debate among evolutionary biologists about ...
It can make you a lot of money.Let's say, for example, your employer offers to match 50% of employee contributions up to 5%. If you earn a $50,000 salary and contribute $2,500 to your retirement ...
Mason was a principal investigator for the NASA Twins Study. [12] [13] He also led the first demonstration of sequencing in zero gravity and designed the genomics and bioinformatics methods and experimental protocols that were used on the International Space Station (ISS) for the mission to sequence DNA in space for the first time.