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2019 Proof Set. The United States Mint Proof Set, commonly known as the Proof Set in the United States, is a set of proof coins sold by the United States Mint.The proof set is popular with coin collectors as it is an affordable way to collect examples of United States coinage in proof condition.
Proof coinage refers to special early samples of a coin issue, historically made for checking the dies (as in demonstrating that something is true) and for archival purposes. In modern times, proofs are often struck in greater numbers, especially for coin collectors ( numismatists ). [1] Nearly all countries have issued proof coinage.
From 1983 until 1998, the annual United States Proof set resumed to only issuing the cent, nickel, dime, quarter, and half-dollar. With the introduction of the 50 State Quarters program in 1999, the Mint began issuing all five quarters released from that year with the already established denominations, thus creating a nine-coin set split across ...
A penny from the 2010 Mint Set. In 2005, the US Mint started to produce Mint Set coins using special sandblasted dies, giving the coins a distinctive satin finish similar to the Special Mint Set coins. Like the Special Mint Set coins, many numismatists consider these to be separate issues from the circulation coins.
The United States Bicentennial coinage is a set of circulating commemorative coins, consisting of a quarter, half dollar and dollar struck by the United States Mint in 1975 and 1976. Regardless of when struck, each coin bears the double date 1776–1976 on the normal obverses for the Washington quarter, Kennedy half dollar and Eisenhower dollar.
The United States produces proof coinage in circulating base metal and, since 1992, in separately sold sets with the dimes, quarters, and half-dollars in silver. For the silver issues, the 1999 set is the most valuable, being the first year of the series and with a relatively small mintage, although prices have significantly decreased since the ...
A generalized form of the diagonal argument was used by Cantor to prove Cantor's theorem: for every setS, the power setof S—that is, the set of all subsetsof S(here written as P(S))—cannot be in bijection with Sitself. This proof proceeds as follows: Let fbe any functionfrom Sto P(S).
Also notable are the 2010 satin finish quarters issued only in 2010 mint sets with a low mintage of 583,897, and proof and silver proof issues, some with mintages almost as low as the 2010 satin finish quarters. There are collector versions of the America the Beautiful 5 ounce Silver Bullion Coin Program which debuted on December 10, 2010.
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