Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the H\"older regularity for obstacle problems to porous medium type
  equations   We show that signed weak solutions to parabolic obstacle problems with porous
medium type structure are locally H\"older continuous, provided that the
obstacle is H\"older continuous.

29
The categories of this paper are: funct-an
10
The categories of this paper are: q-bio
4
The categories of this paper are: cond-mat
14
The categories of this paper are: math-ph
20
The categories of this paper are: acc-phys
16
The categories of this paper are: stat
30
The categories of this paper are: q-alg
32
The categories of this paper are: atom-ph
26
The categories of this paper are: bayes-an
23
The categories of this paper are: solv-int
15
The categories of this paper are: nucl-ex
8
The categories of this paper are: hep-ex
19
The categories of this paper are: eess
18
The categories of this paper are: econ
31
The categories of this paper are: ao-sci
17
The categories of this paper are: q-fin