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The Royal Mail first issued self-adhesive stamps on 19 October 1993, with the introduction of booklets of 20 first class Machin stamps printed by Walsall Security Printers by offset lithography; [3] later a second class stamp was introduced. In the years following, other issues were produced in the self-adhesive format.
A self-affine fractal with Hausdorff dimension=1.8272. In mathematics, self-affinity is a feature of a fractal whose pieces are scaled by different amounts in the x- and y-directions. This means that to appreciate the self similarity of these fractal objects, they have to be rescaled using an anisotropic affine transformation.
The term adhesive refers to a sticky substance, while something that is self-adhesive implies that it will stick without wetting or the application of glue to the product. [ 2 ] One of the most familiar types of adhesive labels is the postage stamp, which was developed in Britain in the 1840s [ 3 ] and became popular in the United States within ...
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 ...
A back-of-the-envelope calculation is a rough calculation, typically jotted down on any available scrap of paper such as an envelope. It is more than a guess but less than an accurate calculation or mathematical proof. The defining characteristic of back-of-the-envelope calculations is the use of simplified assumptions.
The smooth envelope [15] of a stereotype algebra is an envelope of in the category of all involutive stereotype algebras in the class of all dense epimorphisms [14] in with respect to the class of all differential homomorphisms into various C*-algebras with joined self-adjoined nilpotent elements: =.
Mathematical psychology is an approach to psychological research that is based on mathematical modeling of perceptual, thought, cognitive and motor processes, and on the establishment of law-like rules that relate quantifiable stimulus characteristics with quantifiable behavior (in practice often constituted by task performance).
The problem concerns two envelopes, each containing an unknown amount of money. The two envelopes problem, also known as the exchange paradox, is a paradox in probability theory. It is of special interest in decision theory and for the Bayesian interpretation of probability theory. It is a variant of an older problem known as the necktie paradox.