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2018-04-08 20:40:45 +0200 | asked a question | A way of checking that a multivariate system of equations has a solution? Is there a way to check that a multivariate system of polynomial equations does indeed have a solution(or not)? The context i am using this in is as follows: say i have a system of multivariate polynomial equations over a finite field, i then put values in for some of the variables, and then i need to check if the resulting system in the remaining unassigned variables has a solution or not? If not, then i will reassign different values to the other variables until a system with a solution is yielded. Of course because the assigning of these values is random there is a high chance the system has a solution anyway, but in the event that it does not is where i need a way to check whether a solution exists or not. |
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2018-03-29 15:40:59 +0200 | commented question | Does anyone know how to implement a simple XL Algorithm in sage? I have had a look at that but i don't really understand what is going on there because it doesn't seem to provide a solution, also i need to do it for a polynomial system. They define a polynomial system with the following
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2018-03-29 14:45:45 +0200 | asked a question | Does anyone know how to implement a simple XL Algorithm in sage? I need to implement the XL algorithm in sage, which i can use to solve over-determined systems of polynomial equations (more equations than variables). Any help on how to do this? |
2018-03-29 14:22:09 +0200 | marked best answer | Finding the matrix of a linear affine transformation and its inverse How do i get the matrix representation of an affine transformation and it's inverse in sage? I am more so interested in doing this for random affine transformations as i am using them in a multivariate cryptography scheme but for example the following affine transformation over GF(3) |
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2018-03-21 18:41:40 +0200 | commented answer | Creating a symbolic matrix in a loop and then substituting values in for the variables? After trying this it says that |
2018-03-21 16:52:39 +0200 | marked best answer | Multiplying matrices with different parents I am trying to multiple a symbolic 1x1 matrix with one element in it, by a square matrix over a finite field. for example to be multiplied with them matrix however when i try this i get the following error: TypeError: unsupported operand parent(s) for *: 'Full MatrixSpace of 1 by 1 dense matrices over Multivariate Polynomial Ring in x0, x1, x2, x3, x4, x5 over Finite Field of size 31' and 'Full MatrixSpace of 6 by 6 dense matrices over Finite Field of size 31' Is there a way to do this? |
2018-03-21 16:45:49 +0200 | commented answer | Creating a symbolic matrix in a loop and then substituting values in for the variables? Okay thanks for that, that seems to have worked for me. But i have now ran into another issue. After substitution of these random values i have made the resulting equations in the remaining variables equal to random values in |
2018-03-21 14:05:34 +0200 | commented answer | Creating a symbolic matrix in a loop and then substituting values in for the variables? The error occurs after running |
2018-03-21 09:03:24 +0200 | commented answer | Creating a symbolic matrix in a loop and then substituting values in for the variables? After changing
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2018-03-21 01:24:43 +0200 | commented answer | Creating a symbolic matrix in a loop and then substituting values in for the variables? Thanks a lot for this. However when i have tried to implement this as follows:
Where eqn is my list of |
2018-03-20 22:51:34 +0200 | asked a question | Evaluating a list of multivariate equations at random values. I have a list of multivariate equations, there are I already know this is very wrong as the indexing will already go out of bounds since |
2018-03-20 18:28:59 +0200 | commented answer | Creating a symbolic matrix in a loop and then substituting values in for the variables? Thanks for your help i have edited the question to be more specific with what i require as i realize my initial question was not as precise. If you can help with that that would be great. |
2018-03-20 18:26:38 +0200 | edited question | Creating a symbolic matrix in a loop and then substituting values in for the variables? I need to create a symbolic matrix in terms of the variables xi with one row of n elements for a given integer n, so for example if n=5 i would need to compute the matrix As a follow on from this i then need to substitute in random values from a finite field say EDIT: I need to substitute in random values from a finite field say |
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