Encyclopedia > Hereford

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Cathedral and market town in the west of England; county town of Herefordshire. Known chiefly as a trading centre for a wider agricultural and rural area.

Hereford is the home of the Special Air Service or SAS.

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Finite difference

... differential operators such as u'(x) by a difference operator such as (u(x+h)-u(x))/h for some small but finite h. Doing this substitution for a large enough number of ...