diff --git a/logic3.tex b/logic3.tex
index 0268c53..2ce9491 100644
--- a/logic3.tex
+++ b/logic3.tex
@@ -47,6 +47,7 @@
 \input{inputs/lecture_20}
 \input{inputs/lecture_21}
 \input{inputs/lecture_22}
+\input{inputs/lecture_23}
 
 \cleardoublepage