Suppose that I have a domain and a marker in
domain, markers = create_nested_rectangles()
here the functioncreate_nested_rectangles() is my own function, then the domain is foreground if the corresponding value of the markers is 1, then how to generate the function space of the subdomain?
See for instance
http://jsdokken.com/FEniCS-workshop/src/multiphysics/submeshes.html
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