diff --git a/latex/yssymbols.sty b/latex/yssymbols.sty
index 3b8704c..b1c72a6 100644
--- a/latex/yssymbols.sty
+++ b/latex/yssymbols.sty
@@ -35,6 +35,8 @@
 \let\epsilon\varepsilon
 \let\kappa\varkappa
 \let\phi\varphi
+\let\bigland\bigwedge
+\let\biglor\bigvee
 }
 
 \def\ceil#1{\left\lceil#1\right\rceil}