Mathematical Conversations

Three Fingers are Enough to Count to N (Or, How Not to Hang a Painting)

In this talk, I’ll describe one of the most surprising algorithms in computer science: a way to count arbitrarily high while maintaining just three bits of state and a clock. It turns out that the main idea behind the algorithm also appears in a classic physical puzzle about hanging paintings. I will provide each audience member with a version of this puzzle to try solving on their own. No background assumed!

Date & Time

November 05, 2025 | 6:00pm – 8:00pm

Location

Simons Hall Dilworth Room

Speakers

Rahul Ilango, Institute for Advanced Study

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