diff --git a/latex/yssymbols.tex b/latex/yssymbols.tex
index a246ead..64c7245 100644
--- a/latex/yssymbols.tex
+++ b/latex/yssymbols.tex
@@ -59,4 +59,9 @@
 
 \def\enspart#1{\mathscr P\left(#1\right)}
 
+\def\ie{\textsl{ie.}\xspace}
+\newcommand{\tvers}[1]{\xrightarrow[\ \: #1 \:\ ]{}}
+\DeclareMathOperator*{\petito}{o}
+\DeclareMathOperator*{\grando}{O}
+
 \endinput
\ No newline at end of file