J recurrence

BesselJ order reduction through backward recurrence.

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Reduces the order of a Bessel function using backward recurrence,

$J_{v-1}(x) = \frac{2v}{x} J_v(x) - J_{v+1}(x)$

Cephes Math Library Release 2.8: June, 2000

x	input argument.
v	current order.
newv	new order.
cancel	return the larger of the last two iterates on the theory that it may have less cancellation error.

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