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My favourite resources for FEM were the book and courses that Hans Petter Langtangen (RIP) wrote at Simula. FEniCs made FEM so easy, it’s truly an excellent software project that is unfortunately not as well known as it should be within the community.

http://hplgit.github.io/num-methods-for-PDEs/doc/web/index.h...

http://hplgit.github.io/num-methods-for-PDEs/doc/pub/index.h...

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> FEniCs made FEM so easy

https://fenicsproject.org/

Indeed, was blown away when I saw it for the first time over a decade ago, compared to the convoluted C++ FEM libraries I had seen before that.

Used it in its infancy for my PhD work - absolutely loved it, despite its teething problems. Also +1 for Langtangen!

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