st: Typo in integral discussion

["FEIVESON, ALAN H. (AL) (JSC-SD) (NASA)" <alan.h.feiveson@nasa.gov>]

OOPS- another error - 

In Step 5, the expression 

I(-oo, x) x*fhi(k*x + h)*PHI(c*x + d)


should read

I(-oo, a) x*fhi(k*x + h)*PHI(c*x + d) dx

Al Feiveson
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