Last Updated：2026/01/01
Sentence
Pi...
came
to
be
called
the
Ludolphian
number,
after
Ludolph
van
Ceulen,
a
German
mathematician
who
approximated
it
to
thirty-five
decimal
places...
a
calculation
that
took
Ludolph
most
of
his
life
to
accomplish,
and
gave
him
such
satisfaction
that
he
had
the
digits
engraved
on
his
tombstone...
the
stone
vanished,
possibly
to
be
turned
into
a
sidewalk
slab.
Somewhere
in
Leiden,
people
may
be
walking
over
Ludolph's
digits.
Quizzes for review
Pi... came to be called the Ludolphian number, after Ludolph van Ceulen, a German mathematician who approximated it to thirty-five decimal places... a calculation that took Ludolph most of his life to accomplish, and gave him such satisfaction that he had the digits engraved on his tombstone... the stone vanished, possibly to be turned into a sidewalk slab. Somewhere in Leiden, people may be walking over Ludolph's digits.
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