#8899: Implement non commutative symmetric functions
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Reporter: nthiery
| Owner: sage-combinat
Type: enhancement
| Status: closed
Priority: major
| Milestone: sage-5.4
Component: combinatorics
| Resolution: fixed
Keywords: sd40
| Work issues:
Report Upstream: N/A
| Reviewers: Mike Zabrocki, Franco Saliola, Mike Hansen
Authors: Jason Bandlow, Chris Berg, Franco Saliola, Nicolas M. Thiéry
| Merged in: sage-5.4.beta1
Dependencies: #12953, #12956, #12959, #13238, #13243, #5457
| Stopgaps:
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Comment (by nthiery):
Replying to [comment:51 jdemeyer]:
> This patch abuses `assert` and `AssertionError`. `assert` should not be
used for control flow. An `assert` checks something which should always be
true, a failed assertion is always a bug in the program.
>
> For example:
> {{{
> sage: R = NonCommutativeSymmetricFunctions(QQ).R()
> sage: R.skew([2,1], [1])
> Traceback (most recent call last):
> ...
> AssertionError: x must be an element of Non-Commutative
Symmetric Functions over the Rational Field
> }}}
> This is a simple user mistake, for which `assert` is not right.
>
> I think this must be fixed.
I guess that's ok after all. See the same comment on #5457.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/8899#comment:52>
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