Hi,
The patch attached fixes the derivative of the Bessel K function. -- Raoul
Index: src/algebra/combfunc.spad.pamphlet
===================================================================
--- src/algebra/combfunc.spad.pamphlet (revision 3085)
+++ src/algebra/combfunc.spad.pamphlet (working copy)
@@ -768,7 +768,7 @@
ahalf * (besselI (n-1,x) + besselI (n+1,x))
iBesselKGrad(l: List F): F ==
n := first l; x := second l
- ahalf * (besselK (n-1,x) + besselK (n+1,x))
+ ahalf * (-besselK (n-1,x) - besselK (n+1,x))
ipolygammaGrad(l: List F): F ==
n := first l; x := second l
polygamma(n+1, x)
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