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20181126 20:16:34 0600  commented answer  Finding coprime integers near a lattice point This works! Thanks! 
20181126 20:15:55 0600  commented question  Finding coprime integers near a lattice point I am not quite sure what you mean, since $\gcd(1275,1309)=17$. 
20181126 00:49:39 0600  asked a question  Finding coprime integers near a lattice point I have a list $L$ of ordered pairs $(n,m)$ where $n$ and $m$ are integers. I would like to know which elements $(n,m)$ in $L$ satisfy the property that $\gcd(n+i,m+j) \neq 1$ for $i =1,0,1$ and $j =1,0,1.$ For example the point $(55,21)$ has this property since $[(55+i,21+j) ] = [(54,20),(54,21),(54,22),(55,20),(55,21),(55,22),(56,20),(56,21),(56,22)].$ I have tried the following :

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20150609 13:45:03 0600  commented question  Assigning variables in a list That is probably true since I am very new to Python and to programming in general. The code I used is a bit lengthy so I will try to explain in words what I need. I basically want Sage to assume V[i]=V[7i] for i in range(j) when solving the system. I tried to use the assume command but wasnt successful. 
20150609 13:39:57 0600  commented answer  Assigning variables in a list Thanks, but this is not what I was looking for. I would like sage to assume x=d, y=c and so on when solving the system. 
20150608 14:52:51 0600  asked a question  Assigning variables in a list I have a variables list which I use to construct a system of linear equations then I use sage to solve this system. Before I use the solve command I like to equate some of the variables in the list. For example if V is the following list I would like to assign 
20150522 11:26:00 0600  commented answer  Doubly indexed sum Thanks very much for your help! it works. 
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20150522 10:53:04 0600  asked a question  Doubly indexed sum I would like to define a doubly indexed sum. Below is what I did: I get the global name 'a_' is not defined error. I tried this when there is only one index and it works, but doesnt seem to work for double index. Can anyone help me with this? 