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In geometry, an envelope of a planar family of curves is a curve that is tangent to each member of the family at some point, and these points of tangency together form the whole envelope. Classically, a point on the envelope can be thought of as the intersection of two " infinitesimally adjacent" curves, meaning the limit of intersections of ...
Printed glassine envelope for the photographer Arthur Weston, c. 1900 Glassine envelope. Glassine is a smooth and glossy paper which is air-, water-, and grease-resistant. It is usually available in densities between 50–90 g/m 2 (0.010–0.018 lb/sq ft). It is translucent unless dyes are added to the paper to color it or make it opaque.
An envelope is a common packaging item, usually made of thin, flat material. It is designed to contain a flat object, such as a letter or card. Traditional envelopes are made from sheets of paper cut to one of three shapes: a rhombus, a short-arm cross or a kite. These shapes allow the envelope structure to be made by folding the sheet sides ...
The 2 pence Mulready stationery issued in 1840. Rowland Hill expected the Mulready stationery to be more popular than the postage stamps but the postage stamp prevailed. The design was so elaborate and misunderstood that it generated widespread ridicule and lampooning, and in addition was perceived in some areas as a covert government attempt to control the supply of envelopes, and hence ...
This makes the envelope more expensive. There is also the argument that the paper of the envelope can be substituted with lesser-quality paper as the envelope no longer must be written upon; [4] this perhaps was more relevant at the time of Callahan's invention but is a somewhat specious claim today. Over time the quality of paper generally has ...
The envelope theorem is an important tool for comparative statics of optimization models. [ 2 ] The term envelope derives from describing the graph of the value function as the "upper envelope" of the graphs of the parameterized family of functions { f ( x , ⋅ ) } x ∈ X {\displaystyle \left\{f\left(x,\cdot \right)\right\}_{x\in X}} that are ...
Liner notes are descended from the program notes for musical concerts, and developed into notes that were printed on the outer album jacket or the inner sleeve used to protect a traditional 12-inch vinyl record, i.e., long playing or gramophone record album. The term descends from the name "record liner" or "album liner".
The nuclear envelope, also known as the nuclear membrane, [1] [a] is made up of two lipid bilayer membranes that in eukaryotic cells surround the nucleus, which encloses the genetic material. The nuclear envelope consists of two lipid bilayer membranes: an inner nuclear membrane and an outer nuclear membrane. [ 4 ]
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