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-rw-r--r--content/know/concept/interaction-picture/index.pdc3
1 files changed, 2 insertions, 1 deletions
diff --git a/content/know/concept/interaction-picture/index.pdc b/content/know/concept/interaction-picture/index.pdc
index 45950ff..89aff58 100644
--- a/content/know/concept/interaction-picture/index.pdc
+++ b/content/know/concept/interaction-picture/index.pdc
@@ -197,7 +197,8 @@ $$\begin{aligned}
\mathcal{T} \bigg\{ \bigg( \int_{t_0}^{t} \hat{H}_{1,I}(t') \dd{t'} \bigg)^n \bigg\}
\end{aligned}$$
-Here, we recognize the Taylor expansion of $\exp$,
+This construction is occasionally called the **Dyson series**.
+We recognize the well-known Taylor expansion of $\exp\!(x)$,
leading us to a final expression for $\hat{K}_I$:
$$\begin{aligned}