Typo in Q8 shape function definition

005316d4 · Frans van der Meer · b3259209 · 005316d4
Commit 005316d4 authored 4 months ago by Frans van der Meer
--- a/book/fem/shape.md
+++ b/book/fem/shape.md
@@ -160,7 +160,7 @@ The 9-node quadrilateral element
 A popular alternative is one where the center node is removed, resulting in an 8-node quadrilateral element with the following shape function:

 $$
-N_i=a_i+b_ix+c_iy+d_ix^2+e_ixy+f_iy^2+g_ix^2y+h_ixy
+N_i=a_i+b_ix+c_iy+d_ix^2+e_ixy+f_iy^2+g_ix^2y+h_ixy^2
 $$