Return how many integer grid points there are inside a 3D sphere of radius r centred at (0,0,0) (including points on the edge).
Neither string operations nor interpolations are allowed!
Back to basics 4 - Search Path
intersection of matrices
02 - Vector Variables 4
05 - Vector Equations 2
Chebyshev polynomials of the 1st Kind
Radial Zernike polynomials
Shifted Hexagonal Tiling Dots in a Circle
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