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Max Destabilizer Rank
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luke naylor latex documents
research
Max Destabilizer Rank
Commits
543f5d72
Commit
543f5d72
authored
1 year ago
by
Luke Naylor
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Trim out old outline bullet points
parent
fa1aea1d
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#28041
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1 year ago
Stage: test
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543f5d72
...
...
@@ -626,17 +626,6 @@ with the goal of cutting down the run time.
\subsection*
{
Problem statement
}
Goals:
\begin{itemize}
\item
link repo
\item
Calc max destab rank
\item
Decrease mu(E) starting from mu(F) taking on all poss frac vals
\item
iterate over something else
\item
Stop when conditions fail
\item
method works same way for both rational beta
_{
-
}
but also for walls
larger than certain amount
\end{itemize}
Fix a Chern character
$
v
$
with positive rank,
$
\Delta
(
v
)
\geq
0
$
,
and
$
\beta
_{
-
}
(
v
)
\in
\QQ
$
.
The goal is to find all Chern characters
$
u
=(
r,c
\ell
,d
\ell
^
2
)
$
which satisfy the
...
...
@@ -674,7 +663,6 @@ the Bogomolov inequalities and consequence 3 of lemma
\ref
{
lem:pseudo
_
wall
_
numerical
_
tests
}
(
$
\chern
_
2
^{
\beta
_{
-
}}
(
u
)
>
0
$
).
\subsubsection*
{
Finding
$
d
$
for fixed
$
r
$
and
$
c
$}
$
\Delta
(
u
)
\geq
0
$
induces an upper bound
$
\frac
{
c
^
2
}{
2
r
}$
on
$
d
$
, and the
...
...
@@ -682,17 +670,8 @@ $\chern_2^{\beta_{-}}(u)>0$ condition induces a lower bound on $d$.
The values in the range can be tested individually, to check that
the rest of the conditions are satisfied.
\subsection*
{
Limitations
}
Goals:
\begin{itemize}
\item
large rank forces mu to beta
_{
-
}
, so many vals of mu(E) checked
needlessly
\item
noticeably slow (show benchmark)
\end{itemize}
The main downside of this algorithm is that many
$
r
$
,
$
c
$
pairs which are tested
end up not yielding any solutions for the problem.
In fact, solutions
$
u
$
to our problem with high rank must have
$
\mu
(
u
)
$
close to
...
...
@@ -712,7 +691,7 @@ Here are some benchmarks to illustrate the performance benefits of the
alternative algorithm which will later be described in this article [ref].
\begin{center}
\begin{tabular}
{
|r|l|l|
}
\begin{tabular}
{
|r|l|l|
}
\hline
Choice of
$
v
$
on
$
\mathbb
{
P
}^
2
$
&
$
(
3
,
2
\ell
,
-
2
)
$
...
...
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