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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

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

.

 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)]))
 
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)
self.get_object()(*args, **kwds)
    410 
    411 def __repr__(self):
 
__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)
 
CoxeterGroup(cartan_type)

RuntimeError: coxeter3 must be installedinstalled