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The backward differentiation formula (BDF) is a family of implicit methods for the numerical integration of ordinary differential equations.They are linear multistep methods that, for a given function and time, approximate the derivative of that function using information from already computed time points, thereby increasing the accuracy of the approximation.
In 1988, the X Consortium adopted BDF 2.1 as a standard for X Window screen fonts, [2] but X Windows has largely moved to other font standards such as PCF, Opentype, and Truetype. Version 2.2 added support for non-Western writing. For example, glyphs in a BDF 2.2 font definition can specify rendering from top-to-bottom rather than simply left ...
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The Bahrain Defence Force (Arabic: قوة دفاع البحرين, abbreviated BDF) is the military force of the Kingdom of Bahrain. The Bahrain Defence Force is under the direct command and leadership of a commander-in-chief who holds the rank of field marshal .
The Barbados Defence Force (BDF) is the name given to the combined armed forces of Barbados. The BDF was established 15 August 1979, and has responsibility for the territorial defence and internal security of the island. The Headquarters for the Barbados Defence Force is located at St. Ann's Fort, The Garrison, Saint Michael.
The Botswana Defence Force (BDF, Tswana: Sesole Sa Botswana) is the military of Botswana. The main component of the BDF is the Botswana Ground Force ; there is also an air wing and a riverine patrol contingent attached to the ground forces, with 10 Panther airboats and 2 Boston Whaler Raider class.
The Belize Defence Force (BDF) is the military of Belize, and is responsible for protecting the sovereignty of the country. The BDF is under the Ministry of National Defence and Border Security, which is currently headed by Hon. Florencio Marin Jr.; the BDF itself is commanded by Brigadier General Azariel Loria .
The Barbados Defence Force also sponsors a team the second division, Division One. Both teams are commonly called "Barbados Defence Force" or simply BDF, but to distinguish the two clubs in competitions in which both teams participate (like the Barbados FA Cup), the Premier League side are called BDFSP and the Division One side are called BDF.