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WeylGroups :: cartanMatrix(RootSystem)

cartanMatrix(RootSystem) -- the Cartan matrix of a root system

Synopsis

Description

i1 : R=rootSystemA(3)

o1 = RootSystem{...8...}

o1 : RootSystem
i2 : cartanMatrix R

o2 = | 2  -1 0  |
     | -1 2  -1 |
     | 0  -1 2  |

              3        3
o2 : Matrix ZZ  <--- ZZ