By default, the only assumption that Symbol object assumes is commutative
(which is True).
Rest all are taken as None (i.e. not defined or cannot be determined).
You can list all the assumptions defined for a symbol x by
`x.assumptions0` .
or,
if you want to check for each assumption you can do:
x.is_<assumption>
To know all possible assumptions read form Line 32 to Line 116 of this:
https://github.com/sympy/sympy/blob/master/sympy/core/assumptions.py#L32
Yes, there is a *new* assumptions system that is underway. But it is far
from complete. This blog
<http://matthewrocklin.com/blog/work/2013/02/05/Assuming/> gives a pretty
good explanation of what the new assumptions system is going to be.
On Saturday, 14 March 2015 03:32:33 UTC+5:30, Amit Saha wrote:
>
> Hi,
>
> From a sympy user's perspective, which is the "getting started"
> document for the current assumptions implementation? Couple of things
> I am looking for:
>
> - When I create a Symbol object, what is the default list of
> assumptions about it? How do I find it?
> - What are all the possible assumptions for a Symbol?
>
> I think there is a "new" assumptions implementation in the works -
> what are the main changes that are going to happen?
>
>
> Thanks and apologies if I missed to look at the right places.
>
> Best,
> Amit.
>
>
> --
> http://echorand.me
>
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