Limits with dictionaries
Suppose I have a dictionary that is the result of a
solve command, for example,
I also have an expression stored, for example,
expr1 = 3*n1^2
In this example, I want to find the limit of
n1 -> 2.
How can I do this given some expression and some dictionary in general?
I haven't figured it out with
(I know that if it were just substitution, I could use
expr1.subs_expr(D) but I have cases where I believe I need to use limits instead of substitution.)