## Burcin's status report for SD 12

### pynac

- print higher degree terms first
- added:
- support for symbolic binomial and factorial
`.latex()`method`.collect_common_factors()`iterators and

`__getitem__``.function()`method to allow creating`CallableSymbolicExpressions`with pynac expressions

Changes above will be in the pynac-0.1.2 release, which should be released with Sage 3.3.

I have patches that

add constants for

`Infinity`and`UnsignedInfinity`(to pynac)- implement arithmetic with infinity
- make 1/gamma(-1) = 0
- fix series expansion of 1/(1/sqrt(x) + 1/x)

which need to be cleaned up and tested more. They should be available for testing before I get home (next Tuesday).

## bugs fixed

- #4981 clean up polynomial_ring.py
- #4840 FLINT: call the stack cleanup function at exit
#3298 Cython warnings for

`PolyBoRi`

## reviews

- #4850 bug in power_mod
- #5027 comparing complex i raises error
- #2957 Singular multivariate polynomials are buggy on exponent overflow)