Example image of eyePlorer eyePlorer map for 'Grandi's series': Luigi Guido Grandi Series (mathematics) Divergent series Cesàro summation Telescoping series Divergent geometric series Eilenberg–Mazur swindle History of calculus Mathematician Rigour Limit point Absolute convergence Cesàro mean 1 − 2 + 4 − 8 + · · · 1 − 2 + 3 − 4 + · · · 1 + 2 + 4 + 8 + · · · Dirichlet eta function Grandi Thomson's lamp Convergence of Fourier series Improper integral Invalid proof
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