Go-go dancing 1960s-era clubgoers wore miniskirts and knee-high, high-heeled boots, which eventually came to be called go-go boots. Night club promoters in the mid‑1960s then conceived the idea of hiring women dressed in these outfits to entertain patrons. The term "go-go" derives from the phrase "go-go-go" for a high-energy person, and was influenced by the French expression "à gogo", meaning "in abundance, galore", which is in turn derived from the ancient French word "la gogue" for "joy, happiness". On 19 June 1964, Carol Doda began go-go dancing topless at the Condor Club on Broadway and Columbus in the North Beach neighborhood of
Lyndon word associative and commutative product, which is denoted by ш, and which on the words can be recursively defined by The "shuffle algebra" on the alphabet "A" is defined to be the additive group "R" endowed with ш as multiplication. Radford's theorem now states that the Lyndon words are algebraically independent elements of this shuffle algebra, and generate it; thus, the shuffle algebra is isomorphic to a polynomial ring over "k", with the indeterminates corresponding to the Lyndon words. Lyndon word In mathematics, in the areas of combinatorics and computer science, a Lyndon word is a nonempty string that is strictly