The all-important `Community Bonding Period`

ends!! During these three weeks, I have come to learn a lot more things about SymPy, and especially its `Series`

module, the module I would be improving this summer. The first week of the CBP was wasted since I had college exams going on, and couldn’t focus. After they ended, I set my blog, and had a meeting over Hangouts with **Sartaj**.

The meeting ended with the following plan of action to be done in the CBP :-

- Currently, I will try to understand about the inheritance methodology of Formal Power Series, the algorithm behind computing Formal Power Series, and the logic behind improving the XFAIL tests.
- I will also try to deduce means to include
`composition, and coefficient sequence of power of fps as operations`

on fps. - Get familiarized with the documentation style of SymPy.
`Gitter`

will be the primary channel of communication. I will soon add my blog to`planet-sympy`

as well.

I started by thinking about the `XFAIL`

tests which were about `functions having symbolic terms in test_formal.py`

. Previously,

```
fps(x**n*sin(x**2),x).truncate() gave rise to a Value Error.
```

So, I thought of splitting the `x**n`

term from the function itself, use the rest of the portion to compute the `fps`

accordingly, and then multiply the symbolic term in the `xk`

(powers of x) and `ind`

(independent term) respectively.

- I made a PR #16869 incorporating those changes. It’s a
`WIP Pull request`

, since the code was too nested and heuristic changes had to be modified. - I also read
`Wikipedia articles`

for implementation of convolution, composition and coeff. of power sequence of fps. I will try to implement this the following coding week. - I read the official
**SymPy**documentation of the`series`

module.

All in all, this was a great phase. Had some constructive discussions with Sartaj as well. Looking forward to the next enchanting phase, the **Coding Period** (Phase 1). Till then, adios !!