collecting terms
21Common collector — Figure 1: Basic NPN common collector circuit (neglecting biasing details). In electronics, a common collector amplifier (also known as an emitter follower or BJT voltage follower) is one of three basic single stage bipolar junction transistor… …
22Ball-jointed doll — A ball jointed doll is any doll that is articulated with ball and socket joints. In contemporary usage when referring to modern dolls, and particularly when using the acronyms BJD or ABJD it usually refers to modern Asian ball jointed dolls. [… …
23История почты и почтовых марок Карелии — Карелия † фин. Karjala …
24Местные почты Шпицбергена — Почтовая марка частной почты компании «Vesteraalens Dampskibsselskab» (Шпицберген, 1896) В конце XIX  начале …
25Местные почты Саксонии — Почтовая карточка местной почты Дрездена «Dresdner Verkehrs Anstalt Hansa» (1898). Король Альберт …
26Lorentz group — Group theory Group theory …
27Numismatic terminology — This article is a collection of concise Numismatic and coin collecting terms for the beginner or professional. Numismatics (ancient Greek: polytonic|νομισματική) is the scientific study of money and its history in all its varied forms. While… …
28Голубая Александрия — У этого термина существуют и другие значения, см. Александрия (значения). Голубая Александрия англ. Alexandria «Blue Boy» Postmaster’s Provisional …
29Curvilinear coordinates — Curvilinear, affine, and Cartesian coordinates in two dimensional space Curvilinear coordinates are a coordinate system for Euclidean space in which the coordinate lines may be curved. These coordinates may be derived from a set of Cartesian… …
30Projective transformation — A projective transformation is a transformation used in projective geometry: it is the composition of a pair of perspective projections. It describes what happens to the perceived positions of observed objects when the point of view of the… …
