diff --git a/problems/problem8/description.tex b/problems/problem8/description.tex
index 20031df..06aaacb 100644
--- a/problems/problem8/description.tex
+++ b/problems/problem8/description.tex
@@ -209,7 +209,7 @@ \subsection{Detection Amplitude}
 determined by the event magnitude and travel time.
 
 \[\log(\Lambda_a^{ik}) \sim \text{Gaussian}(\ \cdot \ | \ \mu^k_{a0} 
-+ \mu^k_{a1} e^i_m + \mu^k_{a2} I_T(\Delta_{ik})\  ,\ \sigma_a^k \ ) . \]
++ \mu^k_{a1} e^i_m + \mu^k_{a2} \Delta_{ik}\  ,\ \sigma_a^k \ ) . \]
 
 
 \subsection{False Detections}