Russell Lim – Medium

Russell Lim

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Nice Math Problems

Simple Sequence Stumps the World’s Best (IMO 2024 Problem 3)

Here’s a nice way to understand it 🥰

Aug 6, 2024

Simple Sequence Stumps the World’s Best (IMO 2024 Problem 3)

Aug 6, 2024

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Cantor’s Paradise

The Greatest Mathematicians — A Data Visualisation

Our modern society is built upon mathematics. And mathematics is built upon the achievements of thousands of outstanding individuals…

Jun 18, 2022

The most influential mathematicians — a data visualisation.

Jun 18, 2022

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Cantor’s Paradise

Least Squares vs Least Absolute Errors —A 250-Year-Old Debate

From Gauss and the birth of statistics to modern data science and machine learning

May 8, 2022

Scatterplot with least squares regression line and least absolute value regression line. Background image is brain and computer chip, symbolising artificial intelligence.

May 8, 2022

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Nice Math Problems

A Graph Theory Problem With a Clever Solution You Would Never Think Of ✨

Emails between Friends and Non-Friends

May 4

A Graph Theory Problem With a Clever Solution You Would Never Think Of ✨

May 4

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Nice Math Problems

“Math Like a Girl” — A Nice EGMO Problem to Test Your Skills

2025 European Girls Mathematical Olympiad — Problem 1

Apr 29

“Math Like a Girl” — A Nice EGMO Problem to Test Your Skills

Apr 29

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Nice Math Problems

A Beautifully Simple Number Theory Problem (2025 Indian Math Olympiad)

Simple — when you know how! 😅

Apr 19

A Beautifully Simple Number Theory Problem (2025 Indian Math Olympiad)

Apr 19

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Nice Math Problems

Can These Cubics Have Integer Roots Only? (Indian Math Olympiad)

Here is a really nice algebra problem from the 2021 Indian National Math Olympiad.

Jan 8

Can These Cubics Have Integer Roots Only? (Indian Math Olympiad)

Jan 8

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Nice Math Problems

Want a Challenge ?— Try This Overlapping Rectangles Problem

Find the Largest Number of Squares than CANNOT be Covered

Dec 15, 2024

Want a Challenge ?— Try This Overlapping Rectangles Problem

Dec 15, 2024

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Nice Math Problems

IMO 2024 Problem 1 — “Explain it Like I’m 12”

An Olympiad Algebra problem explained with only 7th Grade Algebra …

Jul 23, 2024

IMO 2024 Problem 1 — “Explain it Like I’m 12”

Jul 23, 2024

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Nice Math Problems

IMO 2024 — USA Wins! China 2nd, Korea 3rd.

Plus a Fairytale 4th Place for India

Jul 20, 2024

IMO 2024 — USA Wins! China 2nd, Korea 3rd.

Jul 20, 2024

Russell Lim

Russell Lim

I teach high school mathematics in Melbourne, Australia. I like thinking about interesting problems and learning new things.

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