1/ Talking about threads: yes, I could take a steel cylinder, a strip of paper, and a file, and make a thread. And it could be decent.
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4/ A vs B does not work. There are an infinite number of solutions to "f() is the inverse of g()". A develops a spherical shape...
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5/ and there are an infinite number of spheres (varying r) and matching g() (concave matching shape).
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