From f2970c55894b3c8d5fd2926a8918d166988109fe Mon Sep 17 00:00:00 2001
From: Prefetch
Date: Fri, 12 Nov 2021 20:20:05 +0100
Subject: Expand knowledge base

---
 content/know/concept/interaction-picture/index.pdc | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

(limited to 'content/know/concept/interaction-picture/index.pdc')

diff --git a/content/know/concept/interaction-picture/index.pdc b/content/know/concept/interaction-picture/index.pdc
index 1ce330d..45950ff 100644
--- a/content/know/concept/interaction-picture/index.pdc
+++ b/content/know/concept/interaction-picture/index.pdc
@@ -40,8 +40,10 @@ With $\hat{H}_S(t)$ the full Schrödinger Hamiltonian.
 We define the unitary conversion operator:
 
 $$\begin{aligned}
-    \hat{U}(t)
-    \equiv \exp\!\Big( i \frac{\hat{H}_{0,S} t}{\hbar} \Big)
+    \boxed{
+        \hat{U}(t)
+        \equiv \exp\!\bigg( i \frac{\hat{H}_{0,S} t}{\hbar} \bigg)
+    }
 \end{aligned}$$
 
 The interaction-picture states $\ket{\psi_I(t)}$ and operators $\hat{L}_I(t)$
-- 
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