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検索内容:
paradoxical intention
noun
Ehrenfest paradox
name
(physics)
A
relativistic
paradox
concerning
the
concept
of
Born
rigidity
within
special
relativity,
where
an
ideally
rigid
cylinder
that
is
made
to
rotate
about
its
axis
of
symmetry.
The
radius
R
as
seen
in
the
laboratory
frame
is
always
perpendicular
to
its
motion
and
should
therefore
be
equal
to
its
value
R₀
when
stationary.
However,
the
circumference
should
appear
Lorentz-contracted
to
a
smaller
value
than
at
rest.
This
leads
to
the
contradiction
that
R
=
R₀
and
R
<
R₀.
Loschmidt's paradox
name
Burali-Forti paradox
name
paradoxical rage reaction
noun
gentle murder paradox
noun
unexpected hanging paradox
noun
A
paradox
about
a
person's
expectations
about
the
timing
of
a
future
event
which
they
are
told
will
occur
at
an
unexpected
time.
It
is
based
on
the
idea
that
a
prisoner,
told
that
he
will
be
hanged
on
a
day
unknown
to
him,
concludes
that
"I
cannot
be
hanged
on
Friday
because
if
I
haven't
been
hanged
by
the
end
of
Thursday
then
it
would
no
longer
be
a
surprise",
and
so
on
backwards
through
the
week.
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