Expand knowledge base, remove comments

1 files changed, 0 insertions, 1 deletions

diff --git a/content/know/concept/navier-cauchy-equation/index.pdc b/content/know/concept/navier-cauchy-equation/index.pdc
index d3802d3..a17d69d 100644
--- a/content/know/concept/navier-cauchy-equation/index.pdc
+++ b/content/know/concept/navier-cauchy-equation/index.pdc
@@ -72,7 +72,6 @@ we start by inserting Hooke's law into Newton's law:
 
 $$\begin{aligned}
     \rho \pdv[2]{u_i}{t}
-    %= f_i + \sum_{j} \nabla_j \sigma_{ij}
     &= f_i + 2 \mu \sum_{j} \nabla_j u_{ij} + \lambda \sum_{j} \nabla_j \bigg( \delta_{ij} \sum_{k} u_{kk} \bigg)
     \\
     &= f_i + 2 \mu \sum_{j} \nabla_j u_{ij} + \lambda \nabla_i \sum_{j} u_{jj}