On Fri, Feb 28, 2014 at 07:11:22AM -0800, Harsh Gupta wrote:
>    improve it. [1]@asmeurer can you tell me about some particular use cases
>    of unevaluated solve object.

I'll try to answer.

We can use this object for bookkeeping of some problem.

Sometimes we can't solve the problem, but
0) we can transform original problem to some "canonical" form
1) we can produce a numerical solution (evalf)
2) or as a series (e.g. if we can solve the problem exactly for some
   particular parameter value)
3) we can deduce some assumptions (e.g., that solution set is finite, all
   solutions are positive or integers)

However, this is not a specific issue for solve, we already have Limit,
Sum, Integral, ImageSet and so on.