Similar to 空関数

Convex function

Barrier function

Closed convex function

Baire function

Bounded function

Paillier cryptosystem

1 + 1 + 1 + 1 + ⋯

1/2 + 1/4 + 1/8 + 1/16 + ⋯

1/2 − 1/4 + 1/8 − 1/16 + ⋯

1/4 + 1/16 + 1/64 + 1/256 + ⋯

Hundredth

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9

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Forcing (mathematics)

Axiom of empty set

Effective descriptive set theory