Inspriation/ideas taken from: https://sudonull.com/post/93035-Writing-an-FEM-calculator-in-less-than-180-lines-of-code
Minimal FEM solver in 150 lines
Inspriation/ideas taken from: https://sudonull.com/post/93035-Writing-an-FEM-calculator-in-less-than-180-lines-of-code