Dear Sir/friends,
How to give manifold structure to set of all $C^2$ path over any manifold.
Dear Sir/friends, How to give manifold structure to set of all $C^2$ path over any manifold. 


If by "path" you mean a map with domain $[0,1]$ then this is a standard construction and is independent of the class of maps (providing it is contained in $C^0$). You can find it in many places, search MathSciNet for "manifold" and "mapping space", or you can almost find it in my paper Constructing Smooth Manifolds of Loop Spaces. I deal with maps from $S^1$ there but there's no difference in the construction. If by "path" you mean a map with domain $\mathbb{R}$ then it is much, much more complicated. With the standard topology then it isn't a manifold. You can put a topology on it to make it a manifold, but it has uncountably many components. For more on this, look in Kriegl and Michor's book A Convenient Setting for Global Analysis (that also has the construction for $[0,1]$ for the smooth setting, which readily adapts to $C^2$). 


I give such a manifold structure here: The tangent bundle to an infinitedimensional manifold 

