Leisure centres in Cardiff used in the 1958 British Empire and Commonwealth Games held in Cardiff. The leisure centre is served by Cardiff Bus services 21, 23, 24, 25 and 27. Pentwyn Leisure Centre () opened in 1989 in Pentwyn in the north east of the city. Its facilities include a leisure pool with slide, waves and features, 4 badminton courts, multi use sports hall, 2 squash courts, fitness suite, community suite, an upper activity area, crèche, junior activities, children's parties, holiday programmes,bar/coffee area, poolside café, and suites available for private function hire with catering and licensed bar. In November 2009, the Welsh Open
Particle in a box a physically unimportant sign change. Here one sees that only a discrete set of energy values and wavenumbers "k" are allowed for the particle. Usually in quantum mechanics it is also demanded that the derivative of the wavefunction in addition to the wavefunction itself be continuous; here this demand would lead to the only solution being the constant zero function, which is not what we desire, so we give up this demand (as this system with infinite potential can be regarded as a nonphysical abstract limiting case, we can treat it as such and "bend the rules"). Note that giving