Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Positive Strong Amalgamation   We present the notions of positively complete theory and general forms of
amalgamation in the framework of positive logic. We explore the fundamental
properties of positively complete theories and study the behaviour of companion
theories by a change of constants in the language. Moreover, we present a
general form of amalgamation and discuss some forms of strong amalgamation.

12
The categories of this paper are: nucl-th
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The categories of this paper are: quant-ph
4
The categories of this paper are: cond-mat
20
The categories of this paper are: acc-phys
33
The categories of this paper are: plasm-ph
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The categories of this paper are: dg-ga
32
The categories of this paper are: atom-ph
21
The categories of this paper are: adap-org
15
The categories of this paper are: nucl-ex
34
The categories of this paper are: chem-ph
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The categories of this paper are: q-bio
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The categories of this paper are: eess
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The categories of this paper are: nlin
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The categories of this paper are: astro-ph
16
The categories of this paper are: stat
23
The categories of this paper are: solv-int