Similar to 高校数学の美しい物語

MathWorld

Catalogue of Triangle Cubics

Encyclopedia of Triangle Centers

PlanetMath

Digital Library of Mathematical Functions

MathOverflow

Wolfram Demonstrations Project

Scholarpedia

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

Annals of Mathematics

Axiom (computer algebra system)

ASM-N-2 Bat

Mumble (software)

Javapedia

.eg

.tz

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