From dc3498fd50121eadbdd3ddac5bf950a16e2b50cb Mon Sep 17 00:00:00 2001
From: Prefetch
Date: Thu, 18 Nov 2021 20:07:12 +0100
Subject: Expand knowledge base

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

(limited to 'content/know/concept/imaginary-time')

diff --git a/content/know/concept/imaginary-time/index.pdc b/content/know/concept/imaginary-time/index.pdc
index 68e4e02..55f163a 100644
--- a/content/know/concept/imaginary-time/index.pdc
+++ b/content/know/concept/imaginary-time/index.pdc
@@ -25,8 +25,8 @@ $$\begin{aligned}
     &= \frac{1}{Z} \Tr\!\Big( \exp\!(-\beta \hat{H}_{0,S}(t)) \: \hat{A}_H(t) \: \hat{B}_H(t') \Big)
 \end{aligned}$$
 
-Where the Hamiltonian $\hat{H}_{0,S}$ is time-independent.
-Suppose a time-dependent $\hat{H}_{1,S}$ is added,
+Where the "simple" Hamiltonian $\hat{H}_{0,S}$ is time-independent.
+Suppose a (maybe time-dependent) "difficult" $\hat{H}_{1,S}$ is added,
 so that the total Hamiltonian is $\hat{H}_S = \hat{H}_{0,S} + \hat{H}_{1,S}$.
 Then it is easier to consider the expectation value
 in the [interaction picture](/know/concept/interaction-picture/):
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