Skip to content

fix corner case of plethysm with tensors #41257

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
zabrocki wants to merge 4 commits into
base: develop
Choose a base branch
from
Open

fix corner case of plethysm with tensors #41257

Changes from 1 commit
Commits
Show all changes
4 commits
Select commit Hold shift + click to select a range
c4d48fb
fix corner case of plethysm with tensors
zabrocki Dec 3, 2025
3e35b76
point to issue in doc test
zabrocki Dec 3, 2025
23e3269
move doc test so that p and s are properly defined
zabrocki Dec 3, 2025
cdd5731
accept formatting change
zabrocki Dec 3, 2025
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
6 changes: 4 additions & 2 deletions src/sage/combinat/sf/sfa.py
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -3601,6 +3601,8 @@ def plethysm(self, x, include=None, exclude=None):
sage: s = SymmetricFunctions(T).s()
sage: s[2](5)
15*B[] # B[]
sage: s[[]](tensor([p[1], s[1]]))
p[] # s[]

.. TODO::

Expand Down Expand Up @@ -3646,11 +3648,11 @@ def plethysm(self, x, include=None, exclude=None):
if tensorflag:
tparents = Px._sets
lincomb = Px.linear_combination
elt = lincomb((prod(lincomb((tensor([p[r].plethysm(base(la))
elt = lincomb((prod((lincomb((tensor([p[r].plethysm(base(la))
for base, la in zip(tparents, trm)]),
_raise_variables(c, r, degree_one))
for trm, c in x)
for r in mu),
for r in mu),tensor([base.one() for base in tparents])),
d)
for mu, d in p(self))
return Px(elt)
Expand Down
Loading