Computational Complexity

Computational Complexity and other fun stuff in math and computer science from Lance Fortnow and Bill Gasarch

Wednesday, February 25, 2026

A Probability Challenge

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Last week I had the pleasure of meeting Alex Bellos in Oxford. Among other things Bellos writes the Guardian Monday puzzle column . He gave ...
5 comments:
Sunday, February 22, 2026

ChatGPT gets an easy math problem wrong (I got it right). How is that possible?

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A commenter on  this post  asked for me (or anyone) to solve the problem without AI: A,B,C,D,E are digits (the poster said A could be 0 but ...
22 comments:
Wednesday, February 18, 2026

Joe Halpern (1953-2026)

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Computer Science Professor Joseph Halpern passed away on Friday after a long battle with cancer. He was a leader in the mathematical reason...
5 comments:
Sunday, February 15, 2026

Assigning Open Problems in Class

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I sometimes assign open problems as extra credit problems. Some thoughts: 1) Do you tell the students the problems are open? YES- it would b...
9 comments:
Thursday, February 12, 2026

The Future of Mathematics and Mathematicians

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A reader worried about the future. I am writing this email as a young aspiring researcher/scientist. We live in a period of uncertainty and ...
7 comments:
Sunday, February 08, 2026

I used to think historians in the future will have too much to work with. I could be wrong

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 (I thought I had already posted this but the blogger system we use says I didn't. Apologies if I did. Most likely is that I posted some...
12 comments:
Wednesday, February 04, 2026

Sampling the Oxford CS Library

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Wandering around maze known as the Computer Science building at Oxford I found the computer science library. Rarely these days do you see a ...
3 comments:
Sunday, February 01, 2026

Before the ChatGPT-HW debate there were other ``If students use X to do their HW'' debates

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Lance and I had a blog-debate about  What to do about students using ChatGPT to do their Homework . Some commenters pointed out that we'...
3 comments:
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