## real analysis: Schwarz's space is Frechet's space

I have a question about the Schwartz space integrity test in Folland, proposition 8.2.

Drink $$(f_k)$$ be a Cauchy sequence in Schwartz's space $$S$$.

I understand that in the test you built $$g_0$$ that satisfies

$$partial ^ alpha f_k to partial ^ alpha g_0$$

evenly But in the definition of the norm $$| dot | _ (N, α)$$there is a factor $$(1+ | x |) ^ N$$ and after taking the sup, how can we guarantee the uniform convergence of

$$(1+ | x |) ^ N ( partial ^ alpha f_k) a (1+ | x |) ^ N ( partial ^ alpha g_0)?$$ ## Functional analysis. What is the connection between Frechet's Lie groups and Lie algebras?

An ordinary Lie group has a differentiable structure, that is, it is locally isomorphic to a Euclidean space of finite dimension. A Frechet Lie group, on the other hand, has a multiple Frechet structure, that is, it is locally isomorphic to a Frechet space of infinite dimension.

My question is, what is the connection between the Lie Frechet groups and the Lie algebras? Wikipedia says this:

Some of the relationships between Lie algebras and Lie groups are still valid in this context.

But which ones are still valid and which are not?