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Hypograph of a function. In mathematics, the hypograph or subgraph of a function: is the set of points lying on or below its graph. A related definition is that of such a function's epigraph, which is the set of points on or above the function's graph.
Epigraph of a function A function (in black) is convex if and only if the region above its graph (in green) is a convex set.This region is the function's epigraph. In mathematics, the epigraph or supergraph [1] of a function: [,] valued in the extended real numbers [,] = {} is the set = {(,) : ()} consisting of all points in the Cartesian product lying on or above the function's graph. [2]
anepigraphic coin A coin without an epigraph or inscription. Many ancient coins used only a simple picture of an animal to show value or weight. annealing The process of repeatedly heating and cooling metal in order to relieve stresses. This is often done with coin blanks to make the metal less brittle before striking. assay
Hyperpyron of Emperor Manuel I Komnenos (r. 1143–1180), showing its typical scyphate (cup-shaped) form.. The hyperpyron (Greek: νόμισμα ὑπέρπυρον nómisma hypérpyron) was a Byzantine coin in use during the late Middle Ages, replacing the solidus as the Byzantine Empire's standard gold coinage in the 11th century.
Seven distinct types of coin composition have been used over the past 200 years: three base coin alloys, two silver alloys, gold, and in recent years, platinum and palladium. The base metal coins were generally alloys of copper (for 2 cent coins and lower), and copper/nickel (for 3 and 5 cent coins). Copper/nickel composition is also used for ...
There's no shortage of interesting, old and rare European coins capable of commanding big money at auction -- but are any actually still in circulation and not being handled by private collectors ...
Gold offers high liquidity overall, but physical gold isn't as liquid as digital gold. You'll need to find a buyer if you want to cash in on your investments or head up to your local pawn shop to ...
Under United States law, coins that do not meet the legal tender requirement cannot be marketed as "coins". Instead, they must be advertised as rounds. [3] Bullion coins are typically available in various weights, usually multiples or fractions of 1 troy ounce, but some bullion coins are produced in very limited quantities in kilograms or heavier.
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