diff --git a/preamble-common.tex b/preamble-common.tex
@@ -16,9 +16,8 @@
\usepackage{mathtools, adjustbox}
\usepackage[scr=esstix,cal=boondox]{mathalfa}
\usepackage{enumitem, xfrac, xcolor, cancel, multicol, tabularx, relsize}
-\usepackage{hyperref}
-\usepackage{csquotes}
-\usepackage{xalgebra, xgeometry, functional, capitalgreekall}
+\usepackage{hyperref, csquotes}
+\usepackage{xalgebra, xtopology, xgeometry, functional, capitalgreekall}
\usepackage{ytableau}
\usepackage[backend=biber]{biblatex}
\usepackage{pgfplots, tikz, tikz-cd}
@@ -61,6 +60,8 @@
\newcommand{\XX}{\mathbb{X}} % Double struck X
\newcommand{\YY}{\mathbb{Y}} % Double struck Y
\newcommand{\ZZ}{\mathbb{Z}} % Double struck Z
+\newcommand{\hh}{\mathds{h}} % Double struck h
+\newcommand{\kk}{\mathds{k}} % Double struck k
% Use \blacksquare for \qed
\renewcommand{\qedsymbol}{\ensuremath{\blacksquare}}
@@ -86,11 +87,8 @@
\DeclareRobustCommand\longtwoheadrightarrow
{\relbar\joinrel\twoheadrightarrow}
-% Translate \gcd and \lcm to portuguese
-\let\gcd\relax
-\DeclareMathOperator{\gcd}{mdc}
-\let\lcm\relax
-\DeclareMathOperator{\lcm}{mmc}
+% Fix the subset symbol
+\renewcommand{\subset}{\subseteq}
% Redefine \bar
\renewcommand{\bar}{\overline}