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Area codes 817 and 682 are telephone area codes in the North American Numbering Plan (NANP) in the U.S. state of Texas. The service area comprises the city of Fort Worth and most of the western portion of the Metroplex. Area code 817 was created in 1953 mostly from area code 915, one of the original area codes of 1947
cas – cos + sin function. cdf – cumulative distribution function. c.f. – cumulative frequency. c.c. – complex conjugate. char – characteristic of a ring. Chi – hyperbolic cosine integral function. Ci – cosine integral function. cis – cos + i sin function. (Also written as expi.) Cl – conjugacy class. cl – topological closure.
The blackboard bold letter style originated in the 1960s to distinguish bold letters from ordinary letters on a blackboard or using a typewriter; in professionally typeset documents, bold fonts were used for the same purpose. Since then, blackboard bold has gradually gained currency, and is now commonly used in mathematical printing to denote ...
Such citations and abbreviations are found in court decisions, statutes, regulations, journal articles, books, and other documents. Below is a basic list of very common abbreviations. Because publishers adopt different practices regarding how abbreviations are printed, one may find abbreviations with or without periods for each letter.
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Commonly, one must affix a brightly colored cover sheet to the cover of each classified document to prevent unauthorized observation of classified material (shoulder surfing) and to remind users to lock up unattended documents. The cover sheets warn viewers of the sensitive nature of the enclosed material, but are themselves unclassified.
The FCC logo or the FCC mark is a voluntary mark employed on electronic products manufactured or sold in the United States which indicates that the electromagnetic radiation from the device is below the limits specified by the Federal Communications Commission and the manufacturer has followed the requirements of the Supplier's Declaration of Conformity authorization procedures.
The difficult Pinehurst No.2 course made a number of star names look ordinary during the opening two rounds of the US Open, with the list of those who didn’t make the cut to compete this weekend ...