Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Two Triangles with the Same Orthocenter and a Vectorial Proof of
  Stevanovic's Theorem   In this article we'll emphasize on two triangles and provide a vectorial
proof of the fact that these triangles have the same orthocenter. This proof
will further allow us to develop a vectorial proof of the Stevanovic's theorem
relative to the orthocenter of the Fuhrmann's triangle.

7
The categories of this paper are: hep-th
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The categories of this paper are: astro-ph
29
The categories of this paper are: funct-an
17
The categories of this paper are: q-fin
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The categories of this paper are: eess
3
The categories of this paper are: physics
13
The categories of this paper are: quant-ph
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The categories of this paper are: solv-int
9
The categories of this paper are: nlin
32
The categories of this paper are: atom-ph
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The categories of this paper are: mtrl-th
27
The categories of this paper are: comp-gas
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The categories of this paper are: cmp-lg
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The categories of this paper are: stat
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The categories of this paper are: bayes-an
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The categories of this paper are: cond-mat