Last Updated：2025/12/05
In decision theory, a kind of puzzle in which whenever an ideally rational epistemic agent is awoken from sleep, it has no memory of whether it has been awoken before. Upon being told that it has been woken once or twice according to the toss of a coin, once if heads and twice if tails, it is asked its degree of belief for the coin having come up heads.
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Sleeping Beauty problem
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Source Word
Sleeping Beauty problem
Noun
In
decision
theory,
a
kind
of
puzzle
in
which
whenever
an
ideally
rational
epistemic
agent
is
awoken
from
sleep,
it
has
no
memory
of
whether
it
has
been
awoken
before.
Upon
being
told
that
it
has
been
woken
once
or
twice
according
to
the
toss
of
a
coin,
once
if
heads
and
twice
if
tails,
it
is
asked
its
degree
of
belief
for
the
coin
having
come
up
heads.
Japanese Meaning
意思決定理論におけるパズルで、合理的な認識主体が眠りから目覚める際にこれまでの覚醒の記憶を持たず、コイントスにより一度（表）または二度（裏）の覚醒パターンが生じる中で、表が出た確率（信念）を問う問題
Sense（1）
In
decision
theory,
a
kind
of
puzzle
in
which
whenever
an
ideally
rational
epistemic
agent
is
awoken
from
sleep,
it
has
no
memory
of
whether
it
has
been
awoken
before.
Upon
being
told
that
it
has
been
woken
once
or
twice
according
to
the
toss
of
a
coin,
once
if
heads
and
twice
if
tails,
it
is
asked
its
degree
of
belief
for
the
coin
having
come
up
heads.
（ plural ）
