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Bug in int()?

kschimm 12
August 12 2007
0
Hello all, I'm new here and I don't know if it is the right place to report a bug. I do not own Maple by myself, I'm just using our campus-net installation of Maple 9. I have no access to more recent versions right now. I was typing a functioning old Maple 4 sheet, but got a different result with Maple 9 (see below)! However, I found to introduce a simplify() before the int()-call fixes the problem (see last command). Do higher versions of Maple have the same problem with this code? Thanks, Klaus > restart: with(linalg): Warning, the protected names norm and trace have been redefined and unprotected > s:= (r,t) -> [r*cos(w*t),r*sin(w*t),0]; s := (r, t) -> [r cos(w t), r sin(w t), 0] > s(r,t); [r cos(w t), r sin(w t), 0] > v:= (r,t) -> diff(s(r,t),t); v := (r, t) -> diff(s(r, t), t) > v(r,t); [-r sin(w t) w, r cos(w t) w, 0] > int(sqrt(multiply(v(r,t),v(r,t))),t=0..2*Pi/w); 0 > int(simplify(sqrt(multiply(v(r,t),v(r,t)))),t=0..2*Pi/w); 2 2 1/2 2 (r w ) Pi --------------- w

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