Changes between Version 1 and Version 6 of Ticket #30749
 Timestamp:
 12/01/20 09:04:39 (20 months ago)
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Ticket #30749

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Characteristic polynomial of central Hyperplane arrangement results wrong result?
toCharacteristic polynomial of central Hyperplane arrangement returns wrong result?

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Ticket #30749 – Description
v1 v6 21 21 True 22 22 }}} 23 24 Here is another failure in characteristic polynomial: 25 26 {{{ 27 sage: tau = AA((1+sqrt(5))/2) 28 sage: ncn = [[2*tau+1,2*tau,tau],[2*tau+2,2*tau+1,tau+1],[1,1,1],[tau+1,tau+1,tau],[2*tau,2*tau,tau],[tau+1,tau+1,1],[1,1,0],[0,1,0],[1,0,0],[tau+1,tau,tau]] 29 sage: H = HyperplaneArrangements(AA,names='xyz') 30 sage: x,y,z = H.gens() 31 sage: A = H() 32 sage: for v in ncn: 33 ....: a,b,c = v 34 ....: A = A.add_hyperplane(a*x + b*y + c*z) 35 ....: 36 sage: A.n_regions() 37 Traceback (most recent call last): 38 ... 39 ValueError: arrangement cannot simultaneously have h and h as hyperplane 40 }}}