### HCT triangle implementation in FEniCS

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Hi everybody, this is my first post on this board.

I am working on Finite Element Analysis in elasticity theory. In particular, I have to work with functions in the Sobolev space

$H^2\left(\Omega\right):=\left\{v\in H^1\left(\Omega\right);\nabla v\in\left[H^1\left(\Omega\right)\right]^N\right\}$

In order to perform a finite element analysis on such a space via conforming methods, assuming that the domain is non-rectangular, we need to use Hsieh-Clough-Tocher triangles, whose properties are defined in the seminal paper

I am working on Finite Element Analysis in elasticity theory. In particular, I have to work with functions in the Sobolev space

$H^2\left(\Omega\right):=\left\{v\in H^1\left(\Omega\right);\nabla v\in\left[H^1\left(\Omega\right)\right]^N\right\}$

`H`^{2}(Ω):={`v`∈`H`^{1}(Ω);∇`v`∈[`H`^{1}(Ω)]^{N}} .In order to perform a finite element analysis on such a space via conforming methods, assuming that the domain is non-rectangular, we need to use Hsieh-Clough-Tocher triangles, whose properties are defined in the seminal paper

`http://www.ams.org/journals/mcom/1978-32-142/S0025-5718-1978-0482249-1/S0025-5718-1978-0482249-1.pdf`

I tried the software FreeFEM++ and it is possible to use this kind of finite element but I cannot find the equivalent FEniCS command.

Please, could you tell me what I have to do in order to load the aforementioned Finite Element?

Community: FEniCS Project

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