Hi, I have the following problem: Input: positive integer n, real number y (1) a:=1, b:=1 (2) for i =1 to n do (3) a:= (a*y)/i, (4) b:=b+a (5) end do (6) output: b I am struggling to find the number of assignments in terms of n. I understand for (2), I will need (n-1) assignments. For (3), will I need the sum of (i+1)? Not sure what to do with the rest of it... Any help would be appreciated. thanx. antonio

Hi, Would appreciate some help - Re: checking solutions of the first order DE in Maple? Tried to search in Help, but could only find solutions to 2nd order DE. For instance, when I enter: > ode := diff(y(x), x) = y^2*exp(x); d 2 --- y(x) = y exp(x) dx > solve(ode); I get: Error, (in solve) cannot solve expressions with diff(y(x), x) for x > Many thanks! Antonio

Hi, Could anybody help me with the command that can check group multiplication of permutations in Maple? For instance, alpha=(1234)(56) and beta=(125)(36) So, alpha*beta=(135264) or beta*alpha=(153426) Not sure how to check it in Maple. thanx a lot. antonio

Hi, I have a task where x=r*exp(a) and y=r*exp(-a). f = g(x,y) I need to prove that df/dx=(exp(-a)/2*r) * (r*df/dr + df/da). The result I am getting is: df/dx=(exp(-a)/r) * (r*df/dr + df/da). Does not look difficult but I don't seem to be able to get 2 in the denominator. Any help would be appreciated! Thanks!

Happy New Year to all! I have a problem here where x=r*exp(a) and y=r*exp(-a). I need to find d(x,y)/d(r,a) in Maple. I used the command below: solve(`∂`(x, y)/`∂`(r, theta)) and got the following result: {r=r,theta=ln(RootOf((r _Z) ∂ ((r)/(_Z))))} I wonder if there are any other methods to check d(x,y)/d(r,a). Many thanx. Antonio.