diff --git a/logic2.tex b/logic2.tex
index aed93db..7bc043d 100644
--- a/logic2.tex
+++ b/logic2.tex
@@ -41,6 +41,7 @@
 \input{inputs/lecture_15}
 \input{inputs/lecture_16}
 \input{inputs/lecture_17}
+\input{inputs/lecture_18}
 
 
 \cleardoublepage