passagemath-coxeter3

10.8.4 verified Fri May 01 auth: no python

Passagemath interface to coxeter3: Coxeter groups, Bruhat ordering, Kazhdan-Lusztig polynomials. Version 10.8.4 requires Python >=3.11, <3.15.

pip install passagemath-coxeter3

Common errors

error ModuleNotFoundError: No module named 'sage.interfaces.coxeter3' ↓

cause Importing from SageMath namespace after migration to passagemath.

fix

Use 'from passagemath.coxeter3 import Coxeter3' instead.

error ImportError: libcoxeter3.so: cannot open shared object file ↓

cause The coxeter3 shared library is not installed or not in LD_LIBRARY_PATH.

fix

Install coxeter3 binary (e.g., 'conda install -c conda-forge coxeter3' on Linux).

breaking The coxeter3 interface is no longer part of SageMath; you must use passagemath packages. ↓

fix Install passagemath-coxeter3 and import from passagemath.coxeter3.

gotcha The coxeter3 system must be separately installed (e.g., via conda or system package). pip install only installs the Python interface. ↓

fix Ensure coxeter3 binary is available on $PATH or installed via system package manager.

Coxeter3

wrong

from sage.interfaces.coxeter3 import Coxeter3

correct

from passagemath.coxeter3 import Coxeter3

SageMath interface removed in passagemath; use passagemath namespace.

Create a Coxeter group of type H3, construct an element from a reduced word, and print its length.

from passagemath.coxeter3 import Coxeter3
cox = Coxeter3('H3')
w = cox.from_reduced_word([1,2,1,3])
print(w.length())