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
The Anniversary (Fawlty Towers) The Anniversary (Fawlty Towers) "The Anniversary" is the fifth episode of the second series of BBC sitcom "Fawlty Towers". As in other episodes, the letters of the sign for Fawlty Towers are shown rearranged in the opening sequence. In this episode, it says "Flowery Twats". The use of the obscene word has caused this to be given a 12 certificate by the BBFC, which is the only episode in the series to have a more restrictive rating than PG. On the morning of their wedding anniversary, Sybil recalls how Basil forgot last year. Basil has secretly invited their closest friends