• 415 Harmonic series
ᐥ｢1/n Σn=1,∞｣ divergesᐥ ｢1/n Σn=1,∞｣ = 1/1 + 1/2 + (1/3+1/4) + (1/5+1/6+1/7+1/8) + ... > 1/1 + 1/2 + (1/4+1/4) + (1/8+1/8+1/8+1/8) + ... = 1 + 1/2 + 1/2 + 1/2 + ... = ∞ ...
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