10-14-2017, 03:44 AM

???

e.g. int(e^(-ax),x,0,infinity)

vs

int(e^(-a*x),x,0,infinity)

The first version gives a result of infinity, while the second is 1/a for RE(a)>0.

I've noticed that sometimes ax is accepted as a*x and since CAS doesn't report errors when an undefined variable is used, it's often hard to catch these kinds of errors.

Are there any rules for when ax is permissable over a*x ?

Thx

-Donald

e.g. int(e^(-ax),x,0,infinity)

vs

int(e^(-a*x),x,0,infinity)

The first version gives a result of infinity, while the second is 1/a for RE(a)>0.

I've noticed that sometimes ax is accepted as a*x and since CAS doesn't report errors when an undefined variable is used, it's often hard to catch these kinds of errors.

Are there any rules for when ax is permissable over a*x ?

Thx

-Donald