David Radcliffe's Avatar

David Radcliffe

@radcliffe.dev.bsky.social

Mathematician and dog walker in St. Paul, MN

528 Followers  |  980 Following  |  475 Posts  |  Joined: 19.10.2023  |  2.3697

Latest posts by radcliffe.dev on Bluesky

Preview
a man wearing an aluminum foil hat is sitting in front of a computer Alt: a man wearing an aluminum foil hat is giving a thumbs-up sign.

I almost believe that Google deliberately made search worse so we would have to use Gen AI instead. I will confess that I am using Gen AI for things that I used to search for because search no longer returns relevant results.

07.08.2025 02:07 β€” πŸ‘ 3    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

I refuse to learn who Sydney Sweeney is, or why we are talking about them.

06.08.2025 03:57 β€” πŸ‘ 2    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

God Bless The USA.
Runner up: Jingle Bells

31.07.2025 17:28 β€” πŸ‘ 4    πŸ” 1    πŸ’¬ 0    πŸ“Œ 0

Release the Trump-Epstein files.

29.07.2025 23:29 β€” πŸ‘ 43    πŸ” 9    πŸ’¬ 1    πŸ“Œ 0

Happy Pedant's Pi Day! Everybody knows that 22/7 is a better approximation to Ο€ than 3.14.

22.07.2025 12:59 β€” πŸ‘ 9    πŸ” 3    πŸ’¬ 1    πŸ“Œ 1

ChatGPT cannot "admit" anything. Please try to avoid words that falsely imply that AI models have minds.

21.07.2025 01:35 β€” πŸ‘ 3    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

Is that Father Guido Sarducci?

20.07.2025 23:51 β€” πŸ‘ 2    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

There should be a Math Overflow for stupid math questions.

07.07.2025 21:24 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

Paramount just paid Trump a bribe for merger approval. When Democrats retake power, I’ll be first in line calling for federal charges. In the meantime, state prosecutors should make the corporate execs who sold out our democracy answer in court, today.

02.07.2025 13:50 β€” πŸ‘ 10986    πŸ” 2856    πŸ’¬ 406    πŸ“Œ 300

I know that there are 1440 minutes in a day, so 1440 hours must be 60 days.

27.06.2025 01:24 β€” πŸ‘ 2    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

Does anyone know who invented this problem? I think that I heard it from Matt Enlow, but it might have been some other smart math person on Twitter.

22.06.2025 03:29 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
Tree diagram showing that all numbers from 1 to 100  can be reached by doubling and/or digit reversal, except multiples of 3 or 11.

Tree diagram showing that all numbers from 1 to 100 can be reached by doubling and/or digit reversal, except multiples of 3 or 11.

I have been exploring the following problem. If we start with 1, and repeatedly double and/or reverse the digits, is it possible to reach every number? It's easy to show that multiples of 3 and 11 cannot be reached, but can we reach every other number?

22.06.2025 03:28 β€” πŸ‘ 7    πŸ” 3    πŸ’¬ 1    πŸ“Œ 0

This should be valid syntax in Python, since it's allowed in comprehensions:

for n in range(10) if n % 3:
print(n)

21.06.2025 23:36 β€” πŸ‘ 3    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

I don't know how you can call it a diversion when people's fundamental rights are being attacked. It feels like you are saying that trans kids don't matter.

18.06.2025 16:32 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
Preview
Mark Zuckerberg's Meta AI app is one of the most depressing places online Mark Zuckerberg's Meta AI app has become the saddest place on the internet with its public feed of personal overshares.

Meta launched a stand-alone AI app and now it is full of sensitive content from Facebook users who appear to be unaware that they have made their conversations public: www.businessinsider.com/mark-zuckerb...

12.06.2025 15:17 β€” πŸ‘ 327    πŸ” 162    πŸ’¬ 6    πŸ“Œ 50

Clodding would be a condign punishment. 🐝

12.06.2025 15:17 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
Geordi Drake meme. Geordi from Star Trek: The Next Generation holds his hand out to show disapproval of "National Mall", but points with approval at "Mall of America".

Geordi Drake meme. Geordi from Star Trek: The Next Generation holds his hand out to show disapproval of "National Mall", but points with approval at "Mall of America".

12.06.2025 14:11 β€” πŸ‘ 5    πŸ” 2    πŸ’¬ 1    πŸ“Œ 0

2 + 3 = 5
2 + 3 + 5 + ... + 3833 = 3847 + 3851 + 3853 + ... + 5557
Any others?

10.06.2025 15:13 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

The feud between Musk and Trump is just a publicity stunt to get people to watch Mountainhead.

06.06.2025 01:44 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

Either left or right is fine, but if you're doing both in the same expression then it gets hard to read.

29.05.2025 18:41 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

I think that when you have functions acting on the left and methods acting on the right, the code becomes difficult to read. One wants to be able to read from left to right.

29.05.2025 17:01 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0
Album cover of "Puttin' On The Ritz" by Taco.

Album cover of "Puttin' On The Ritz" by Taco.

Did someone say TACO?

28.05.2025 23:57 β€” πŸ‘ 2    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

Facebook doesn't sell your data. They just sell targeting advertising based on your location, demographics, interests, and behaviors, which is somehow completely different.

28.05.2025 21:18 β€” πŸ‘ 3    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

I'd rather Wang Chung tonight, to be honest.

27.05.2025 04:40 β€” πŸ‘ 5    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

Is it true that 1, 2, 6, 42, and 1806 are the only numbers n such that gcd(d+1, n) > 1 for every proper divisor d of n?

24.05.2025 15:49 β€” πŸ‘ 2    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

Perhaps, but Christianity is a community of believers. When a Christian says that someone else is not a real Christian, they aren't making a factual statement as much as they are trying to exclude that person from the community. I am all for shunning MTG.

23.05.2025 17:10 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

the revealed position of the republican party is that it thinks broad expansion of higher education β€” and especially its expansion for certain americans β€” was a mistake that must be rolled back

23.05.2025 13:08 β€” πŸ‘ 4187    πŸ” 1064    πŸ’¬ 109    πŸ“Œ 55

Math

23.05.2025 01:14 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

I give it 4 weeks until Trump is straight up denying the Holocaust. He sure seems to be moving in that direction.

22.05.2025 13:49 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

@radcliffe.dev is following 20 prominent accounts