Quantum harmonic oscillatorThe quantum harmonic oscillator is the quantum-mechanical analog of the classical harmonic oscillator. Because an arbitrary smooth potential can usually be approximated as a harmonic potential at the vicinity of a stable equilibrium point, it is one of the most important model systems in quantum mechanics. Furthermore, it is one of the few quantum-mechanical systems for which an exact, analytical solution is known.
Negative binomial distributionIn probability theory and statistics, the negative binomial distribution is a discrete probability distribution that models the number of failures in a sequence of independent and identically distributed Bernoulli trials before a specified (non-random) number of successes (denoted ) occurs. For example, we can define rolling a 6 on a dice as a success, and rolling any other number as a failure, and ask how many failure rolls will occur before we see the third success ().
Provençal dialectProvençal (ˌprɒvɒ̃ˈsɑːl, alsoUK-sæl, USˌprou-,_-vən-; provençau or prouvençau pʁuve(n)ˈsaw) is a variety of Occitan, spoken by people in Provence and parts of Drôme and Gard. Historically, the term Provençal has been used to refer to the whole of the Occitan language, but today it is considered more technically appropriate to refer only to the variety of Occitan spoken in Provence. However it can still be found being used to refer to Occitan as a whole, e.g.
Beat (acoustics)In acoustics, a beat is an interference pattern between two sounds of slightly different frequencies, perceived as a periodic variation in volume whose rate is the difference of the two frequencies. With tuning instruments that can produce sustained tones, beats can be readily recognized. Tuning two tones to a unison will present a peculiar effect: when the two tones are close in pitch but not identical, the difference in frequency generates the beating. The volume varies like in a tremolo as the sounds alternately interfere constructively and destructively.
