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2011-10-17 12:16:43 +0200 | asked a question | Creating an array of variables Here is a very very basic question. I want to create a polynomial, say
a_0 I could define these a_i one at a time, but it would be much better to have a way to create an array A of length 20 where A[i] is the coefficient a_i. The idea is that I want to do some operations and solve for these coefficients, which will end up being rational numbers. There must be some very basic command that I don't know, but I can't find it in the documentation. |

2011-10-07 15:51:56 +0200 | commented answer | Finding integer solutions to systems of polynomial equations I have tried using assume(a,'integer) but a still seems to be in the Symbolic Ring. It still gives me an answer for a which is often not an integer for different values of A and B. |

2011-10-07 12:52:03 +0200 | asked a question | Finding integer solutions to systems of polynomial equations Hi, I am trying to do something very simple but have been struggling. Here is a simplified example that I can't get to work. I want to define polynomials with integer coefficients, say
f(A,B) = A+B,
g(A,B) = a I have tried something like this- R.< A,B > = ZZ[] f = A+B var('a', domain = ZZ) var('b', domain = ZZ) g = a solve(f-g==0,a,b), but what it gives me is [a == -((b-1)*B-A)/A, [1]]. How do I define variables a and b which are integers, but unknown integers? No matter what I seem to do, they are put in Symbolic Ring. How do I get the solve command to give me integer solutions to a set of linear equations? |

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