Find the number of points (x,y) in square lattice with x^2 + y^2 =< n. This is related to Jame's Problem 1387. Here you have to find the number of points within a circle.
surface of a spherical planet
given 3 sides, find area of this triangle
Set some matrix elements to zero
Change the sign
Periodic Table 101.
Special Relativity 101.
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