Graggs extrapolation method

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Gragg's extrapolation method (GBS method) An extrapolation method for the solution of ordinary differential equations based on the midpoint rule. For stiff problems a similar scheme can be based on the implicit midpoint rule: yn+1 = yn + h f(xn + ½h, (yn + yn+1)/2)

where h is the stepsize.

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Graggs extrapolation method

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