-
I've now written up the new approach to the sign homomorphism in Sec. 4.5 (after commit c20b570).
Please have a look! There's a little puzzle left: I give a pointed map, Bsgn, from n-element sets t…
-
The `__init__` method of GroupAlgebra did not check for commutativity of the group so that this would happen:
```
sage: G = AbelianGroup(2)
sage: A = GroupAlgebra(G)
sage: A.is_commutative()
True
s…
-
### What is the issue?
In a relatively simple prompt, one of the Phi models went off track and ranted for several thousand words. After, all future responses produced (mostly) garbage output, even in…
-
We should add a Group interface to the docs. Actually, we should add a general AbstractAlgebra object interface, since it seems like some things have to exist for every AbstractAlgebra object, regardl…
-
while I was (am) very happy to have found this function, I always thought an inner product combines sub-objects only? This sees to me an out product with maps (which is why I am happy)
-
I would like to use the commutative=False argument to symbols to make sure
my expressions aren't arbitrarily re-arranged. But in the case of boolean expressions,
I get some un-anticipated behavior.…
-
Coq has a new feature in the upcoming 8.16 release (around summer). Something called reversible coercions. Here is an example of something that we have wanted for a long time:
```coq
Set Primitive…
-
There's a construction called `Spec` which eats a commutative ring `R` and spits out a topological space `Spec R`. To a mathematician it is trivially true that if we have an isomorphism `f : R -> S` t…
-
We should find an existing library for this
-
For example, is there any way to use CAP_project or homalg to actually compute, say, the Schur multiplier $M(G) = H_2(G, Z)$ of a finite permutation group, or $H^2(G, Z)$ resp. $H^2(G, C^*)$?