pw mac

• Subject: pw mac
• From: Richard Hennessy
• Date: Sun, 12 Apr 2009 23:51:38 -0400

I found a bug in the new abs_integrate.mac package in 5.18.0 

load(abs_integrate)$
integrate(f(x)*signum(a*x+b),x);
integrate(f(x%),x%,-b/a,x) * signum(x+b/a)  /* this is wrong */

I think it should be 

integrate(f(x)*signum(a*x+b),x);
integrate(f(x%),x%,-b/a,x) * signum(a*x+b)  /* this is ok */

or 


integrate(f(x)*signum(a*x+b),x);
integrate(f(x%),x%,-b/a,x) * signum(a) *signum(x+b/a)  /* this is ok */

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