-colouring theorem for a suitably triangulated
rooting back in the late years of the nineteenth century, is
considered and discussed in careful detail. A whole string of
corollaries are derived, two particular classes of triangulations
are singled out, and the boundary even vertex set is enquired into
in further detail.
Key Words: Vertex -colourable disc
2010 Mathematics Subject Classification: Primary
05C10; Secondary 05C15.
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