diff --git a/main.tex b/main.tex index 11511ff11bfd67b40e56ac82a85bfea4027cb6c4..4b3abc6199110c7ec3d86e93817a58212c382ccb 100644 --- a/main.tex +++ b/main.tex @@ -151,9 +151,7 @@ followed by refinements on them which give explicit formulae for tighter bounds on $\chern_0(E)$ of potential destabilizers $E$ of $F$. -\section{Characteristic Curves of Stability Conditions Associated to Chern -Characters} - +\section{Setting and Definitions: Clarifying `pseudo'} Throughout this article, as noted in the introduction, we will be exclusively working over one of the following two surfaces: principally polarized abelian surfaces and $\PP^2$. @@ -194,6 +192,14 @@ $\bddderived(X)$, some other sources may have this extra restriction too. Then $\chern(E)$ is a pseudo-semistabilizer of $\chern(F)$ \end{lemma} +\begin{proof} + q.e.d. (TODO) +\end{proof} + + +\section{Characteristic Curves of Stability Conditions Associated to Chern +Characters} + % NOTE: SURFACE SPECIALIZATION Considering the stability conditions with two parameters $\alpha, \beta$ on Picard rank 1 surfaces. @@ -534,8 +540,50 @@ Finally, consequence 4 along with $P$ being to the left of $V_u$ implies $\nu_P(u) > 0$ giving supposition b. \end{proof} +\section{The Problem: Finding Pseudo-walls} + +As hinted in the introduction (\ref{sec:intro}), the main motivation of the +results in this article are not only the bounds on pseudo-semistabilizer +ranks; +but also applications for finding a list (comprehensive or subset) of +pseudo-walls. + +After introducing the characteristic curves of stability conditions associated +to a fixed Chern character $v$, we can now formally state the problems that we +are trying to solve for. + +\begin{problem}[sufficiently large `left' pseudo-walls] +\label{problem:problem-statement-1} + +Fix a Chern character $v$ with positive rank, $\Delta(v) \geq 0$, +and $\beta_{-}(v) \in \QQ$. +The goal is to find all pseudo-semistabilizers $u=(r,c\ell,d\ell^2)$ +which give circular pseudo-walls containing some fixed point +$P\in\Theta_v^-$. +With the added restriction that $u$ `destabilizes' $v$ moving `inwards', that is, +$\nu(u)>\nu(v)$ inside the circular pseudo-wall +(`outward' destabilizers can be recovered as $v-u$). + +This will give all pseudo-walls between the chamber corresponding to Gieseker +stability and the stability condition corresponding to $P$. +\end{problem} + +\begin{problem}[all `left' pseudo-walls] +\label{problem:problem-statement-2} + +Fix a Chern character $v$ with positive rank, $\Delta(v) \geq 0$, +and $\beta_{-}(v) \in \QQ$. +The goal is to find all solutions $u=(r,c\ell,d\ell^2)$ +to problem \ref{problem:problem-statement-1} with the choice +$P=(\beta_{-},0)$. + +This will give all circular pseudo-walls left of $V_v$. +\end{problem} -\section{Loose Bounds on $\chern_0(E)$ for Semistabilizers Along Fixed + +\section{B.Schmidt's Solutions to the Problems} + +\subsection{Loose Bounds on $\chern_0(E)$ for Semistabilizers Along Fixed $\beta\in\QQ$} \begin{dfn}[Twisted Chern Character] @@ -668,7 +716,7 @@ However, when computing all tilt semistabilizers for $v$ on $\PP^2$, the maximum rank that appears turns out to be $\sage{extravagant.actual_rmax}$. \end{example} -\section{B.Schmidt's Wall Finding Method} +\subsection{B.Schmidt's Wall Finding Method} % NOTE: SURFACE SPECIALIZATION The proof for the previous theorem was hinted at in @@ -684,34 +732,6 @@ finding all pseudo-walls when $\beta_{-}\in\QQ$. In section [ref], a different algorithm will be presented making use of the later theorems in this article, with the goal of cutting down the run time. -\begin{problem}[sufficiently large `left' pseudo-walls] -\label{problem:problem-statement-1} - -Fix a Chern character $v$ with positive rank, $\Delta(v) \geq 0$, -and $\beta_{-}(v) \in \QQ$. -The goal is to find all pseudo-semistabilizers $u=(r,c\ell,d\ell^2)$ -which give circular pseudo-walls containing some fixed point -$P\in\Theta_v^-$. -With the added restriction that $u$ `destabilizes' $v$ moving `inwards', that is, -$\nu(u)>\nu(v)$ inside the circular pseudo-wall -(`outward' destabilizers can be recovered as $v-u$). - -This will give all pseudo-walls between the chamber corresponding to Gieseker -stability and the stability condition corresponding to $P$. -\end{problem} - -\begin{problem}[all `left' pseudo-walls] -\label{problem:problem-statement-2} - -Fix a Chern character $v$ with positive rank, $\Delta(v) \geq 0$, -and $\beta_{-}(v) \in \QQ$. -The goal is to find all solutions $u=(r,c\ell,d\ell^2)$ -to problem \ref{problem:problem-statement-1} with the choice -$P=(\beta_{-},0)$. - -This will give all circular pseudo-walls left of $V_v$. -\end{problem} - \subsection*{Algorithm} \subsubsection*{Finding possible $r$ and $c$}