Muffin-tin approximation Muffin-tin approximation The muffin-tin approximation is a shape approximation of the potential well in an crystal lattice. It is most commonly employed in quantum mechanical simulations of the electronic band structure in solids. The approximation was proposed by John C. Slater. Augmented plane wave method (APW) is a method which uses muffin-tin approximation. It is a method to approximate the energy states of an electron in a crystal lattice. The basic approximation lies in the potential in which the potential is assumed to be spherically symmetric in the muffin-tin region and constant in the interstitial region. Wave functions (the augmented
Lead 15th Anniversary Live Box MCs. For "Lead 15th Anniversary Live ～Kan Ima Shirube-sai～", the group performed every a-side they had released since their debut in 2002, up until their then-most recent song "Beautiful Day", which had been released on August 23, 2017. The live was well-received, with people praising the group's stage presence and charisma, even with performing so many songs for one performance, many of which were dance tracks. "Lead Upturn 2017 ～This is Our Day～" was the group's fifteenth live tour. For the performance, most of the music utilized were songs from their seventh studio album "The Showcase", which had been released