Fixed wrong proof marker.

.vscode/project.code-snippets

@@ -175,6 +175,6 @@
   "Cite Proof": {
   "scope": "latex",
     "prefix": "cproof",
-    "body": ["{Proof, {{\\cite[$1]{$2}}}. }$0"]
+    "body": ["[Proof, {{\\cite[$1]{$2}}}. ]$0"]
   }
 }

src/op/example/bc.tex

@@ -17,7 +17,7 @@
 
     is a homeomorphism. Under the identification $\beta X = \Omega(BC(X; \complex))$, $\Gamma_{BC(X; \complex)} = \beta$. 
 \end{theorem}
-\begin{proof}{Proof, {{\cite[Theorem I.6.4]{Zhu}}}. }
+\begin{proof}[Proof, {{\cite[Theorem I.6.4]{Zhu}}}. ]
     Let $\phi \in BC(X; \complex)^* \setminus \ol{E(X)}$, then there exists $\seqf{f_k} \subset BC(X; \complex)$ and $\eps > 0$ such that for every $x \in X$, 
     \[
     f(x) = \sum_{k = 1}^n |f_k(x) - \dpn{f_k, \phi}{BC(X; \complex)}|^2 \ge \eps^2

src/op/example/convolution.tex

@@ -58,7 +58,7 @@
     \Gamma(f)(z) = \sum_{n \in \integer} f(n)z^n
     \]
 \end{theorem}
-\begin{proof}{Proof, {{\cite[Theorem 6.3]{Zhu}}}. }
+\begin{proof}[Proof, {{\cite[Theorem 6.3]{Zhu}}}. ]
     Let $z \in \mathbf{S}^1$ and $f, g \in \ell^1(\integer)$, then by \hyperref[Fubini's Theorem]{theorem:fubini-tonelli},
     \begin{align*}
         F(z)(f * g) &= \sum_{n \in \integer}z^n \sum_{k \in \integer}f(k)g(n-k) \\