From 2a91bdedf299a7fa7b513785d51a63e2f147f37f Mon Sep 17 00:00:00 2001
From: Prefetch
Date: Wed, 10 Nov 2021 15:40:54 +0100
Subject: Expand knowledge base, reorganize Green's functions

---
 content/know/concept/time-ordered-product/index.pdc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'content/know/concept/time-ordered-product/index.pdc')

diff --git a/content/know/concept/time-ordered-product/index.pdc b/content/know/concept/time-ordered-product/index.pdc
index 82c9d0f..7af5acc 100644
--- a/content/know/concept/time-ordered-product/index.pdc
+++ b/content/know/concept/time-ordered-product/index.pdc
@@ -110,7 +110,7 @@ The general definition of $\mathcal{T}$ is:
 $$\begin{aligned}
     \boxed{
         \mathcal{T} \big\{ \hat{a}_1 \cdots \hat{a}_N \big\}
-        \equiv \sum_{p \in P_N}^{} (-1)^p
+        \equiv \sum_{p \in P_N}^{} (\pm 1)^p
         \bigg( \prod_{j = 1}^{N-1} \Theta\big(t_{p_j} \!-\! t_{p_{j+1}}\big) \bigg)
         \bigg( \prod_{k = 1}^N \hat{a}_{p_k}(t_{p_k}) \bigg)
     }
-- 
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