Rubik's Snake, also known as Rubik's Twist, is a type of puzzle toy created by Ernő Rubik, the inventor of the original Rubik's Cube. The Rubik's Snake consists of a series of triangular prisms connected by a flexible hinge, allowing them to be twisted and turned in various directions.
A **symmetric polynomial** is a polynomial in several variables that remains unchanged (symmetric) under any permutation of its variables.
In logic, a second-order predicate is an extension of first-order logic that allows quantification not only over individual variables but also over predicates or sets of individuals. In first-order logic, you can have statements that quantify over objects in a domain (like "for every \(x\), \(P(x)\)").
Naomi McClure-Griffiths is an Australian astronomer known for her work in the field of astrophysics, particularly in the study of the Milky Way galaxy and the dynamics of the interstellar medium. She has made significant contributions to understanding the structure and motion of gas in galaxies, including the processes that lead to star formation. McClure-Griffiths has been involved in various large astronomical surveys and has published numerous research papers on topics related to radio astronomy.