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検索内容:
figurate number
noun
(mathematics,
number
theory)
A
number
equal
to
the
number
of
dots
in
a
geometric
figure
formed
of
dots.
The
series
begins
with
unity
and
is
formed
so
that
subtracting
each
from
the
following,
and
treating
the
series
so
formed
in
the
same
way,
by
a
continuation
of
the
process,
yields
equal
differences.
figurehead
noun
figureth
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