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luke naylor latex documents
research
Max Destabilizer Rank
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25c3fc65
Commit
25c3fc65
authored
1 year ago
by
Luke Naylor
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Refined the epsilon lemma/dfn
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34f6f773
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25c3fc65
...
...
@@ -1032,6 +1032,10 @@ Where $\epsilon_q^1$ and $\epsilon_q^2$ are defined as follows:
\end{lemmadfn}
It's worth noting that
$
\epsilon
_
q
^
2
$
is potentially larger than
$
\epsilon
_
q
^
2
$
but calculating it involves a
$
\gcd
$
, a modulo reduction, and a modulo
$
n
$
inverse, for each
$
q
$
considered.
\begin{proof}
Consider the following tautology:
...
...
@@ -1070,20 +1074,16 @@ Consider the following tautology:
\label
{
eqn:better
_
eps
_
problem
_
k
_
mod
_
n
}
\end{align}
In our situation, we want to find a gap between the right-hand-side of eqn
\ref
{
eqn:positive
_
rad
_
condition
_
in
_
terms
_
of
_
q
_
beta
}
,
and the least element of
$
\frac
{
1
}{
m
}
\ZZ
$
which is strictly greater.
This amounts to finding the least
$
k
\in
\ZZ
_{
>
0
}$
for which
eqn
\ref
{
eqn:finding
_
better
_
eps
_
problem
}
holds.
In our situation, we want to find the least
$
k
$
satisfying
eqn
\ref
{
eqn:finding
_
better
_
eps
_
problem
}
.
Since such a
$
k
$
must also satisfy eqn
\ref
{
eqn:better
_
eps
_
problem
_
k
_
mod
_
n
}
,
we can pick the smallest
$
k
\in
\ZZ
_{
>
0
}$
which satisfies this new condition
(a computation only depending on
$
q
$
and
$
\beta
$
, but not
$
r
$
)
and we are then guaranteed that the gap is at least
$
\frac
{
k
}{
2
mn
^
2
}$
.
A potentially larger gap can also be guaranteed if we choose the least
$
k
\in
\ZZ
_{
>
0
}$
satisfying eqn
\ref
{
eqn:better
_
eps
_
problem
_
k
_
mod
_
gcd2n2
_
a2mn
}
instead, but at the cost of computing several
$
\gcd
$
's and modulo reductions
for each
$
q
$
considered.
we can pick the smallest
$
k
_
q
^
1
\in
\ZZ
_{
>
0
}$
which satisfies this new condition
(a computation only depending on
$
q
$
and
$
\beta
$
, but not
$
r
$
).
We are then guaranteed that the gap
$
\frac
{
k
}{
2
mn
^
2
}$
is at least
$
\epsilon
_
q
^
1
$
.
Furthermore,
$
k
$
also satisfies
eqn
\ref
{
eqn:better
_
eps
_
problem
_
k
_
mod
_
gcd2n2
_
a2mn
}
so we can also pick the smallest
$
k
_
q
^
2
\in
\ZZ
_{
>
0
}$
satisfying this condition,
which also guarantees that the gap
$
\frac
{
k
}{
2
mn
^
2
}$
is at least
$
\epsilon
_
q
^
2
$
.
\end{proof}
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