can not run without coxeter3. how to deal with it
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RuntimeError Traceback (most recent call last)
Cell In [1], line 2
1 R = LaurentPolynomialRing(ZZ, 'v', names=('v',)); (v,) = R._first_ngens(1)
----> 2 W = CoxeterGroup('A3', implementation='coxeter3')
3 H = IwahoriHeckeAlgebra(W, v**Integer(2)); Cp=H.Cp()
4 Cp.product_on_basis(W([Integer(1),Integer(2),Integer(1)]), W([Integer(3),Integer(1)]))
File /home/sc_serv/sage/src/sage/misc/lazy_import.pyx:409, in sage.misc.lazy_import.LazyImport.__call__()
407 True
408 """
--> 409 return self.get_object()(*args, **kwds)
410
411 def __repr__(self):
File /home/sc_serv/sage/src/sage/combinat/root_system/coxeter_group.py:140, in CoxeterGroup(data, implementation, base_ring, index_set)
138 from sage.libs.coxeter3.coxeter_group import CoxeterGroup
139 except ImportError:
--> 140 raise RuntimeError("coxeter3 must be installed")
141 else:
142 return CoxeterGroup(cartan_type)
RuntimeError: coxeter3 must be installed
The error message says
coxeter3 must be installed
. How did you install Sage? What OS are you using? What version of Sage?