Dear Firedrakers, I apologize to insist on the topic of serendipity finite elements. Perhaps my previous message was unclear. I would like to define some simple serendipity quadratic 8-nodes quadrangles and 20-nodes hexaedrain Firedrake but I do not know how to do it. Thanks for your help, Nicolas ---------- Forwarded message --------- De : Karin&NiKo <niko.karin@gmail.com> Date: ven. 24 janv. 2020 à 15:48 Subject: Serendipity elements To: firedrake <firedrake@imperial.ac.uk> Dear Firedrakers, I would like to use continuous finite elements from the serendipity family. At the moment, I would like to use some simple quadratic 8-nodes quadrangles and 20-nodes hexaedra (the S2 element from the “Periodic table of the finite elements”). I do not find any tests in Firedrake src (grep -ri functionspace * | grep \"S). How can I do to use these finite elements? Thanks, Nicolas