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Riemann surface
on 27 Oct 2021
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[r,a]=meshgrid(linspace(0,1,99),linspace(0,4*pi,99));
surf(r.*cos(a),r.*sin(a),sqrt(r).*sin(a/2),sin(a/2),...
'edgecolor','none','facealpha',0.9);
colormap jet;
axis equal;
box on;
view(50,5);
light;