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Zeno's paradox
noun
(philosophy)
Any
of
a
set
of
philosophical
problems
generally
thought
to
have
been
devised
by
the
Greek
philosopher
Zeno
of
Elea
(c.
490–430
BC)
to
support
Parmenides'
doctrine
that,
contrary
to
the
evidence
of
one's
senses,
the
belief
in
plurality
and
change
is
mistaken,
and
in
particular
that
motion
is
nothing
but
an
illusion.
Benardete's paradox
name
(philosophy)
A
philosophical
problem
whereby
a
man
intends
to
walk
a
mile
from
a
particular
point,
but
an
infinity
of
gods
separately
plan
to
obstruct
him.
One
of
them
will
raise
a
barrier
to
stop
his
further
advance
if
he
reaches
the
half-mile
point,
a
second
if
he
reaches
the
quarter-mile
point,
a
third
if
he
goes
one-eighth
of
a
mile,
and
so
on
ad
infinitum.
The
paradox
involves
the
fact
that
(i)
the
man
cannot
begin
walking,
because
a
barrier
will
stop
him
even
at
the
shortest
distance,
but
(ii)
if
he
does
not
begin
walking,
no
barrier
will
rise.
Gibson's paradox
name
Levinthal's paradox
name
The
observation
that,
because
of
the
very
large
number
of
degrees
of
freedom
in
an
unfolded
polypeptide
chain,
the
molecule
has
an
astronomically
large
number
of
possible
conformations,
and
therefore
sequentially
sampling
all
the
possible
conformations
is
not
practical,
yet
most
small
proteins
fold
spontaneously
on
a
millisecond
or
even
microsecond
timescale.
Supplee's paradox
name
(physics)
A
physical
paradox
that
arises
when
considering
the
buoyant
force
exerted
on
a
relativistic
bullet
(or
in
a
submarine)
immersed
in
a
fluid
subject
to
an
ambient
gravitational
field.
If
a
bullet
has
neutral
buoyancy
at
rest
in
a
perfect
fluid
and
is
then
launched
at
relativistic
speed,
observers
at
rest
within
the
fluid
would
conclude
that
the
bullet
should
sink,
since
its
density
will
increase
due
to
the
length
contraction
effect.
On
the
other
hand,
in
the
bullet's
proper
frame
it
is
the
moving
fluid
that
becomes
denser
and
hence
the
bullet
would
float.
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