Last Updated：2025/12/29
Sentence
I
take
account
of
conical
and
biplanar
nodes,
or,
as
I
call
them,
cnicnodes,
and
binodes;
of
pinch-points
on
the
nodal
curve;
and
of
close-points
and
off-points
on
the
cuspidal
curve:
viz.
I
assume
that
there
are
Quizzes for review
I take account of conical and biplanar nodes, or, as I call them, cnicnodes, and binodes; of pinch-points on the nodal curve; and of close-points and off-points on the cuspidal curve: viz. I assume that there are
C, cnicnodes,
B, binodes,
j, pinch-points,
𝜒, close points,
𝜃, off-points,
deferring for the present the explanation of these singularities. The same letters, accented, refer to the reciprocal singularities. Or using trope
as the reciprocal term to node, these will be
C', cnictropes,
B', bitropes,
j', pinch-planes,
𝜒', close-planes,
𝜃', off-planes;
but these present themselves, not in the equations above referred to, but in the reciprocal equations.
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