Similar to 1+2+3+4+…

Broyden–Fletcher–Goldfarb–Shanno algorithm

Limited-memory BFGS

LF-space

M/M/1 queue

T1 space

Abelian category

Archimedes Palimpsest

1 + 1 + 1 + 1 + ⋯

1 + 2 + 4 + 8 + ⋯

1 − 1 + 2 − 6 + 24 − 120 + ⋯

1 − 2 + 4 − 8 + ⋯

1/2 + 1/4 + 1/8 + 1/16 + ⋯

1/2 − 1/4 + 1/8 − 1/16 + ⋯

1/4 + 1/16 + 1/64 + 1/256 + ⋯

1 − 2 + 3 − 4 + ⋯

Basic hypergeometric series

Small set (combinatorics)

Abel's summation formula

Eisenstein series

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