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Commit 589c1a33 authored by Luke Naylor's avatar Luke Naylor
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Minor changes from supervision

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......@@ -50,8 +50,8 @@ This dichotomy does not only hold for real walls, realised by actual objects in
$\bddderived(X)$, but also for pseudowalls. Here pseudowalls are defined as
`potential' walls, induced by hypothetical Chern characters of destabilizers
which satisfy certain numerical conditions which would be satisfied by any real
destabilizer, regardless of whether they are realised by actual elements of
$\bddderived(X)$.
destabilizer, regardless of whether they are realised by actual semistabilizers
in $\bddderived(X)$.
Since real walls are a subset of pseudowalls, the irrational $\beta_{-}$ case
follows immediately from the corresponding case for real walls.
......@@ -991,7 +991,7 @@ proof of theorem \ref{thm:rmax_with_uniform_eps}:
\begin{lemmadfn}[
Finding better alternatives to $\epsilon_F$:
$\epsilon_q^1$ and $\epsilon_q^2$
$\epsilon_{q,1}$ and $\epsilon_{q,2}$
]
\label{lemdfn:epsilon_q}
Suppose $d \in \frac{1}{m}\ZZ$ satisfies the condition in
......@@ -1007,16 +1007,16 @@ Then we have:
\begin{equation*}
d - \frac{(\aa r + 2\bb)\aa}{2n^2}
\geq \epsilon_q^2 \geq \epsilon_q^1 > 0
\geq \epsilon_{q,2} \geq \epsilon_{q,1} > 0
\end{equation*}
Where $\epsilon_q^1$ and $\epsilon_q^2$ are defined as follows:
Where $\epsilon_{q,1}$ and $\epsilon_{q,2}$ are defined as follows:
\begin{equation*}
\epsilon_q^1 :=
\epsilon_{q,1} :=
\frac{k_q^1}{2mn^2}
\qquad
\epsilon_q^2 :=
\epsilon_{q,2} :=
\frac{k_q^2}{2mn^2}
\end{equation*}
\begin{align*}
......@@ -1033,7 +1033,8 @@ 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 $\epsilon_q^2$
It is 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.
......@@ -1077,11 +1078,12 @@ 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 $k_q^1 \in \ZZ_{>0}$ which satisfies this new condition
(a computation only depending on $q$ and $\beta$, but not $r$).
We are then guaranteed that the gap $\frac{k}{2mn^2}$ is at least $\epsilon_q^1$.
We are then guaranteed that the gap $\frac{k}{2mn^2}$ 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 $\frac{k}{2mn^2}$ is at least $\epsilon_q^2$.
which also guarantees that the gap $\frac{k}{2mn^2}$ is at least $\epsilon_{q,2}$.
\end{proof}
......@@ -1094,7 +1096,7 @@ which also guarantees that the gap $\frac{k}{2mn^2}$ is at least $\epsilon_q^2$.
are bounded above by the following expression (with $i=1$ or 2).
\begin{equation*}
\frac{1}{2 \epsilon_q^i}
\frac{1}{2 \epsilon_{q,i}}
\min
\left(
q^2,
......@@ -1104,10 +1106,10 @@ which also guarantees that the gap $\frac{k}{2mn^2}$ is at least $\epsilon_q^2$.
-2Cq
+q^2
+\frac{R}{\lcm(m,2n^2)}
+R \epsilon_q^i
+R \epsilon_{q,i}
\right)
\end{equation*}
Where $\epsilon_q^i$ is defined as in definition/lemma \ref{lemdfn:epsilon_q}.
Where $\epsilon_{q,i}$ is defined as in definition/lemma \ref{lemdfn:epsilon_q}.
\end{theorem}
......
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