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 Lead 15th Anniversary Live Box Lead 15th Anniversary Live Box: Special Box Shiyou (スペシャルBOX仕様 / "Special Box Specification") is a special live DVD collection released by the Japanese hip-hop group Lead on December 20, 2017. The live box featured two separate performances spanning across two DVDs to celebrate the group's fifteenth anniversary in the music industry, having debuted in 2002 with the song "Manatsu no Magic". The first DVD featured the live performed to celebrate their anniversary, "Lead 15th Anniversary Live ～Kan Ima Shirube-sai～", which the group held on July 29th and July 30th of that year; while the second