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Ax-Kochen theorem
name
Ax-Grothendieck theorem
name
(mathematics)
A
result
about
injectivity
and
surjectivity
of
polynomials,
often
given
as
this
special
case:
If
P
is
an
injective
polynomial
function
from
an
n-dimensional
complex
vector
space
to
itself
then
P
is
bijective.
The
full
theorem
generalizes
to
any
algebraic
variety
over
an
algebraically
closed
field.
Helly's selection theorem
name
Helly-Bray theorem
name
Gibbard-Satterthwaite theorem
name
A
theorem
dealing
with
deterministic
ordinal
electoral
systems
that
choose
a
single
winner,
stating
that
for
every
voting
rule,
one
of
the
following
three
things
must
hold:
(i)
the
rule
is
dictatorial,
i.e.
there
exists
a
distinguished
voter
who
can
choose
the
winner;
or
(ii)
the
rule
limits
the
possible
outcomes
to
two
alternatives
only;
or
(iii)
the
rule
is
susceptible
to
tactical
voting:
in
certain
conditions
some
voter's
sincere
ballot
may
not
defend
their
opinion
best.
de Bruijn's theorem
name
(mathematics)
A
theorem
about
packing
congruent
rectangular
bricks
into
larger
rectangular
boxes
so
that
no
space
is
left
over.
It
states
that
a
"harmonic
brick"
(one
in
which
each
side
length
is
a
multiple
of
the
next
smaller
side
length)
can
only
be
packed
into
a
box
whose
dimensions
are
multiples
of
the
brick's
dimensions.
Sylvester-Gallai theorem
name
Liouville-Arnold theorem
name
In
dynamical
systems
theory,
a
theorem
stating
that
if,
in
a
Hamiltonian
dynamical
system
with
n
degrees
of
freedom,
there
are
also
known
n
first
integrals
of
motion
that
are
independent
and
in
involution,
then
there
exists
a
canonical
transformation
to
action-angle
coordinates
in
which
the
transformed
Hamiltonian
is
dependent
only
upon
the
action
coordinates
and
the
angle
coordinates
evolve
linearly
in
time.
Thus
the
equations
of
motion
for
the
system
can
be
solved
in
quadratures
if
the
canonical
transform
is
explicitly
known.
Siegel-Walfisz theorem
name
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