Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Absolutely Continuous Invariant Measures for Nonuniformly Expanding Maps   For a large class of nonuniformly expanding maps of $\Bbb R^m$, with
indifferent fixed points and unbounded distorsion and non necessarily
Markovian, we construct an absolutely continuous invariant measure. We extend
to our case techniques previously used for expanding maps on quasi-H\"{o}lder
spaces. We give general conditions and provide examples to which apply our
result.

3
The categories of this paper are: physics
5
The categories of this paper are: gr-qc
27
The categories of this paper are: comp-gas
33
The categories of this paper are: plasm-ph
34
The categories of this paper are: chem-ph
36
The categories of this paper are: cmp-lg
16
The categories of this paper are: stat
23
The categories of this paper are: solv-int
0
The categories of this paper are: hep-ph
35
The categories of this paper are: mtrl-th
14
The categories of this paper are: math-ph
29
The categories of this paper are: funct-an
37
The categories of this paper are: supr-con
13
The categories of this paper are: quant-ph
20
The categories of this paper are: acc-phys
18
The categories of this paper are: econ