coherent generator
31Morita equivalence — In abstract algebra, Morita equivalence is a relationship defined between rings that preserves many ring theoretic properties. It is named after Japanese mathematician Kiiti Morita who defined equivalence and a similar notion of duality in 1958.… …
32Occam's razor — For the aerial theatre company, see Ockham s Razor Theatre Company. It is possible to describe the other planets in the solar system as revolving around the Earth, but that explanation is unnecessarily complex compared to the modern consensus… …
33Phase-locked loop — PLL redirects here. For other uses, see PLL (disambiguation). A phase locked loop or phase lock loop (PLL) is a control system that generates an output signal whose phase is related to the phase of an input reference signal. It is an electronic… …
34Vector bundle — The Möbius strip is a line bundle over the 1 sphere S1. Locally around every point in S1, it looks like U × R, but the total bundle is different from S1 × R (which is a cylinder instead). In mathematics, a vector bundle is a… …
35Timescape — infobox Book | name = Timescape title orig = translator = image caption = Cover of first edition (hardcover) author = Gregory Benford illustrator = cover artist = country = United States language = English series = genre = Science fiction novel… …
36Passenger car (rail) — This article is about railroad equipment. For other cars, see Automobile and wiktionary definition of passenger car. Amtrak Superliner double deck lounge car …
37Psychoanalytic dream interpretation — Part of a series of articles on Psychoanalysis …
38Group (mathematics) — This article covers basic notions. For advanced topics, see Group theory. The possible manipulations of this Rubik s Cube form a group. In mathematics, a group is an algebraic structure consisting of a set together with an operation that combines …
39Measuring instrument — Captain Nemo and Professor Aronnax contemplating measuring instruments in Twenty Thousand Leagues Under the Sea …
40Cavity magnetron — Magnetron with section removed (magnet is not shown) …
