Last Updated：2022/12/24
For the generation of these combinatorial types no direct method is known, and it appears to be necessary to use combinatorial abstractions — allowable sequences of permutations, 𝜆-functions, chirotopes, combinatorial geometries, or oriented matroids; in our work we will use oriented matroids [BLVS⁺99].
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For
the
generation
of
these
combinatorial
types
no
direct
method
is
known,
and
it
appears
to
be
necessary
to
use
combinatorial
abstractions
—
allowable
sequences
of
permutations,
𝜆-functions,
chirotopes,
combinatorial
geometries,
or
oriented
matroids;
in
our
work
we
will
use
oriented
matroids
[BLVS⁺99].
