inequalities

If I use diophantine(2*x+3*y-5*z-77) I receive this result. {(t_0, -9*t_0 - 5*t_1 + 154, -5*t_0 - 3*t_1 + 77)} Fine so far. However, on occasion one might like to constrain x, y and z to be (say) non-negative. When I use an approach like this< reduce_inequalities([0<=t_0, 0<=-9*t_0 - 5*t_1 + 154, 0<=-5*t_0 - 3*t_1 + 77],[t_0, t_1]) I get: NotImplementedError: inequality has more than one symbol of interest Does sympy, sage, prolog, haskell or some other freely available product have means for solving systems of linear inequalities that arise in this way. Thank you! To reason about integers in

What is the specific code, in order, being executed when I ask for something like >>> 1 <= 3 >= 2 True If both have equal precedence and it's just the order of their evaluation, why does the second inequality function as (3 >= 2) instead of (True >= 2) Consider for example the difference between these >>> (1 < 3) < 2 True >>> 1 < 3 < 2 False Is it just a pure syntactical short-cut hard-coded into Python to expand the second as the and of the two statements? Could I change this behavior for a class, such that a <= b <= c gets expanded to something different? It's looking like the following is

I know that to filter an element with an atttribute called attrName which has value attrValue I do: filter("[attrName='attrValue']") but looking at the docs http://api.jquery.com/category/selectors/ I can't see an option to select all elements s.t. attrName>attrValue Will this work filter("[attrName>'attrValue']") You can do this using the function overload of .filter() , like this: .filter(function() { return $(this).attr("attrName") > "someValue"; }) The solution is jQuery.filter() : $("selector").filter(function() { return $(this).attr("my-attr") > 123; }); Be careful, if you are playing