collecting terms
61Current mirror — A current mirror is a circuit designed to copy a current through one active device by controlling the current in another active device of a circuit, keeping the output current constant regardless of loading. The current being copied can be, and… …
62Kirchhoff's theorem — In the mathematical field of graph theory Kirchhoff s theorem or Kirchhoff s matrix tree theorem named after Gustav Kirchhoff is a theorem about the number of spanning trees in a graph. It is a generalization of Cayley s formula which provides… …
63RL circuit — A resistor inductor circuit (RL circuit), or RL filter or RL network, is one of the simplest analogue infinite impulse response electronic filters. It consists of a resistor and an inductor, either in series or in parallel, driven by a voltage… …
64Postage stamps and postal history of Karelia — Karelia has appeared in philately several times; first as a breakaway republic from Soviet Russia in 1922, later when Eastern Karelia was occupied by Finland during the Continuation War of 1941 to 1944, and in the post Soviet period when… …
65Equating coefficients — In mathematics, the method of equating the coefficients is a way of solving a functional equation of two polynomials for a number of unknown parameters. It relies on the fact that two polynomials are identical precisely when all corresponding… …
66Mail steamer — Mail steamers were steamships which carried the mail across waterways, such as across an ocean or between islands, primarily during the 19th Century and early 20th Century, when the cost of sending a letter was declining to the point an ordinary… …
67Pole splitting — is a type of frequency compensation used in an electronic amplifier in which a capacitor is introduced between the input and output sides of the amplifier with the intention of moving the pole lowest in frequency (usually an input pole) to lower… …
68Klapperpost — [1] Vendedora y el cartero de Klapperpost en Viena (1820) Klapperpost (también alemán: Klapper Post o Klapper Post; Correo matra …
69Missing Virgin — Valor actual más de 100 libras esterlinas (Yvert #7b) Missing Virgin (Virgen perdida) es el nombre filatético del sello de las Islas Vírgenes Británicas de 1867 (Yvert #7b). La descripción …
70Triquéra — Triquéra, Nueva Caledonia, 1860. “Triquéra” (francés) el nombre filatélico de la primera estampilla de Nueva Caledonia emitido en 1860 (Scott #1). Contenido …
