Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Eclectic Content and Sources of Christopher Clavius's Geometria
  Practica   We consider the Geometria Practica of Christopher Clavius, S.J., a
suprisingly eclectic and comprehensive textbook of practical geometry, whose
first edition appeared in 1604. Our focus is on four particular sections from
Books IV and VI where Clavius has either used his sources in an interesting way
or where he has been uncharacteristically reticent about them. These include
the treatments of Heron's Formula, Archimedes' Measurement of the Circle, four
methods for constructing two mean proportionals between two lines, and finally
an algorithm for computing nth roots of numbers.

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The categories of this paper are: chem-ph
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The categories of this paper are: stat
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The categories of this paper are: nlin
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The categories of this paper are: astro-ph
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The categories of this paper are: supr-con
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The categories of this paper are: acc-phys
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The categories of this paper are: dg-ga
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The categories of this paper are: cmp-lg
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The categories of this paper are: gr-qc
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The categories of this paper are: cs
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The categories of this paper are: q-alg
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The categories of this paper are: mtrl-th
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The categories of this paper are: econ
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The categories of this paper are: nucl-th
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The categories of this paper are: hep-ph
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The categories of this paper are: hep-lat