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hello i would like to work on this

hello sir! i would like to work on this issue can you please elaborate it??

Hello sir! i would like to work on this issue if it's not been resolved yet!

@anutosh491 hello sir i have noticed that sympy is representing order terms for negative expansions as `O(-1/x**7)` and the same term for positive expansion as `O(x**(-7))`

@anutosh491 sir for the expansions of `Shi` and `Chi` series from `(x, oo)` there will be infinite terms so we have to take approximations of the terms?

> ``` > >>> Shi(x).series(x,oo) > > -I*pi/2 - (6/x**3 + 1/x + O(x**(-7), (x, oo)))*sinh(x + O(x**(-7), (x, oo)))/x + (24/x**4 + 2/x**2 + 1 + O(x**(-7), (x, oo)))*cosh(x...

> > I think you are almost there....you just need to replace any order term at infinity with zero! you can use this - `result.subs(Order(1/z**n, x), 0)` > > No,...

> Yeah, I know it will work fine, but substituting is not a solution here because, in `series`, you must also include future terms. Now, if you replace the order...

> There are probably many different specialized transfer functions that are often used. For example, a PID controller is a common transfer function. We could have an object that the...

hello @andrewfullard i would like to work on this issue!