A right angle is an angle that measures exactly 90 degrees (°) or \( \frac{\pi}{2} \) radians. It is one of the fundamental angles in geometry and is typically represented by a small square at the vertex of the angle. Right angles are commonly encountered in various geometric shapes, such as squares and rectangles, where the corners form right angles.

Rimfire ammunition is a type of cartridge designed for firearms that utilize a rimfire mechanism for ignition. In these cartridges, the priming compound is located in the rim of the metallic case rather than in a central primer, which is found in centerfire ammunition. When the firing pin strikes the rim of the cartridge, it crushes the priming compound, igniting it and causing the propellant to fire the bullet.

Robert Bowie Owens is not a widely recognized public figure or historical person as of my last knowledge update in October 2023. It’s possible that he may not have significant coverage in notable texts or media.

A commutation matrix, often denoted as \(C\), is a specific type of permutation matrix that is used in linear algebra, particularly in the context of vector and matrix operations. The primary role of the commutation matrix is to facilitate the rearrangement of the elements of a vector or to convert a matrix into a different form. ### Definition For a given vector or matrix, the commutation matrix rearranges the elements when it is multiplied by the vector or applied to the matrix.

Robert C. Martin, often referred to as "Uncle Bob," is a prominent software engineer, author, and speaker known for his work in the field of software development and agile methodologies. He is one of the original authors of the Agile Manifesto and has made significant contributions to the principles of clean code and professional software development.

Robert Gundlach may refer to a specific person, but as of my last knowledge update in October 2021, there isn't a widely recognized individual by that name in popular culture, academia, or other fields. It's possible you meant Jeffrey Gundlach, who is known as an influential investor and the CEO of DoubleLine Capital, specializing in fixed-income investments.

Robert Todd Lincoln (1843-1926) was the eldest son of Abraham Lincoln, the 16th President of the United States, and Mary Todd Lincoln. He had a notable career as a lawyer and businessman and served as the U.S. Secretary of War under Presidents James Garfield and William Howard Taft. He was present at the assassination of his father in 1865 and went on to lead a prominent life, including serving as the president of the Pullman Company.

Roger Bacon (c. 1214–1292) was a medieval English philosopher, Franciscan friar, and early advocate of the scientific method. He is often regarded as one of the first proponents of empiricism and experimental science in the Western tradition. While he is not primarily known as a physicist in the modern sense, his contributions to philosophy and science laid important groundwork for later developments in both fields.

Run-out refers to the deviation of a rotating component from its ideal rotational path or alignment during operation, often measured in terms of how much it wobbles or deviates from a true circle. It is commonly used in mechanical engineering and manufacturing contexts, particularly in relation to components like shafts, discs, or gears.

A rogue black hole is a type of black hole that does not reside within a stable gravitational environment, such as a galaxy or a star cluster. Instead, these black holes move freely through space and are not bound to any particular astronomical structure. They can be formed through various processes, including: 1. **Supernova Explosions**: When massive stars go supernova, they can leave behind a black hole.

Roland Fraïssé was a French mathematician known for his work in various areas of mathematics, particularly in mathematical logic and set theory. One of his notable contributions is related to the field of model theory and the study of the properties of structures in mathematics. He is also associated with concepts in infinitary logic and the foundations of mathematics.

Roman Stanisław Ingarden was a prominent Polish philosopher and phenomenologist, known for his contributions to aesthetics, epistemology, and the philosophy of language. He was born on February 5, 1893, in Lwów, Poland (now Lviv, Ukraine), and passed away on June 14, 1970.

Root-mean-square deviation (RMSD) of atomic positions is a statistical measure used to quantify the differences between two sets of atomic coordinates, typically in the context of molecular modeling, computational chemistry, and structural biology. It is often used to assess the similarity between a predicted structure (e.g., from molecular dynamics simulations or modeling) and a reference structure (e.g., an experimentally determined structure like an X-ray crystal structure).

The Rossiter–McLaughlin effect is an astrophysical phenomenon observed during transits of exoplanets, specifically when a planet passes in front of its host star from our viewpoint. This effect occurs because the planet partially blocks the star's light and causes a distortion in the Doppler shift of the star's light as seen from Earth. When a planet transits, it blocks different parts of the star's surface as it moves across it.

"Ross Street" could refer to a specific street name found in various cities around the world. Without more context, it's difficult to pinpoint a particular location or significance. There are likely multiple streets named Ross Street in different regions, each with its own unique characteristics, businesses, and residential areas.

The permanent of a square matrix is a function that is somewhat similar to the determinant but differs in the signs of the terms involved.

The Rothe–Hagen identity is a mathematical identity related to the theory of partitions, specifically concerning the representations of integers as sums of parts. While detailed references specific to the identity might be scarce, it is often discussed in the context of combinatorial mathematics or number theory. The identity is named after mathematicians who have contributed to partition theory and can be expressed in various forms. Generally, it can relate different ways of summing integers or the coefficients of generating functions.