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Christopher D. Long

@superellipse

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11.11.2024
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Latest posts by Christopher D. Long @superellipse

My guess was a binary counter combined with an adder, with delay equalling 2+8*D1+16*D2+32*D3+64*D4. But I don't own one, so I can't directly verify.

08.02.2026 04:27 👍 1 🔁 0 💬 1 📌 0
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So Long to Cheap Books You Could Fit in Your Pocket

I am certainly going to miss mass markets, and cherish some of the ones I have (Cornell Woolrich’s Black novels ftw). But some of the ones I’ve pulled off the shelf lately are virtually unreadable, like a copy of 1984 that looks like it was printed entirely in 8-point bold.

06.02.2026 13:06 👍 273 🔁 25 💬 30 📌 3
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Given the information on the back, how do the dip switches (likely) work? How much of a delay is the current setting?

07.02.2026 05:55 👍 0 🔁 0 💬 1 📌 0

The golden snake is definitely a top 10 animal.

07.02.2026 00:03 👍 0 🔁 0 💬 0 📌 0

The probability seed m beats seed n is n^β/(m^β + n^β) for β≥1. We have a standard knockout tournament with 2^k players seeded 1..2^k i.e. seed s faces seed 2^k+1-s in the first round etc. For which β does seed 1 have a positive probability of winning the tournament as k → ∞?

06.02.2026 21:54 👍 0 🔁 0 💬 0 📌 0

A person with n dice attacks a person with n dice. We match highest dice, then next highest and so on. Ties go to the defender. The asymptotic expected number of losses for the defender is c*sqrt(n) for some constant c. What is c?

06.02.2026 04:02 👍 0 🔁 0 💬 0 📌 0
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MIP*=RE We show that the class MIP* of languages that can be decided by a classical verifier interacting with multiple all-powerful quantum provers sharing entanglement is equal to the class RE of recursively...

I don't know if this is common knowledge, but two quantumly-entangled hyper-aliens could (probabilistically) convince you that a particular Turing machine eventually halted, even if it'd take 10^500 steps. (assuming my understanding is correct)

arxiv.org/abs/2001.043...

05.02.2026 04:49 👍 0 🔁 0 💬 0 📌 0
NSF Award Search: Award # 2347850 Structure theory for measure-preserving systems, additive combinatorics, and correlations of multiplicative functions

For the math folks on here: NSF has suspended Terry Tao's grant. www.nsf.gov/awardsearch/...

31.07.2025 22:44 👍 277 🔁 122 💬 9 📌 38
A book with a dark red cover. The title is Egyptian Hieroglyphics for Complete Beginners

A book with a dark red cover. The title is Egyptian Hieroglyphics for Complete Beginners

Stopped in Oxfam for some fair-trade chocolate and came away with a new hobby

19.06.2025 13:44 👍 6689 🔁 353 💬 248 📌 40
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a cartoon character is holding a bunch of money and the words shut up and take are above him ALT: a cartoon character is holding a bunch of money and the words shut up and take are above him
10.04.2025 15:43 👍 1 🔁 0 💬 0 📌 0

Arrange the following three sums in increasing order of size, where n goes from 1 to infinity.

A. Sum[(-1)^(n+1) sin(n)/n]
B. Sum[(-1)^(n+1) (sin(n)/n)^2]
C. Sum[(-1)^(n+1) (sin(n)/n)^3]

(via Stan Wagon)

I think @gregegansf.bsky.social will find this one particularly interesting.

10.04.2025 02:21 👍 0 🔁 0 💬 0 📌 0
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13.12.2024 14:33 👍 1 🔁 0 💬 1 📌 0

Hello, everyone. I'll be importing my followers from the Bad Place this week, so please have patience.

26.11.2024 06:47 👍 2 🔁 0 💬 0 📌 0
Fishtopher, a brown and black striped tabby cat. He lays in the shelter next to a chrome bowl. His large head is hung low to the floor of the kennel, as he looks up with sad green eyes and very large, round cheeks. His ears are slightly down and his mouth looks small and almost like a frown. He protects his body with his round tail in a very sad, closed off manner.

Fishtopher, a brown and black striped tabby cat. He lays in the shelter next to a chrome bowl. His large head is hung low to the floor of the kennel, as he looks up with sad green eyes and very large, round cheeks. His ears are slightly down and his mouth looks small and almost like a frown. He protects his body with his round tail in a very sad, closed off manner.

Fishtopher, a brown and black striped tabby cat, now in his forever home. He stands up and leans against the couch but the lower half of his body is blocked by the camera person's leg. He looks slightly upward with large, sparkling green eyes. His ears are pointed up and forward and his mouth is almost in a wide smile. His pink nose is a much brighter pink now, and his large cheeks are still large, but smaller in comparison.

Fishtopher, a brown and black striped tabby cat, now in his forever home. He stands up and leans against the couch but the lower half of his body is blocked by the camera person's leg. He looks slightly upward with large, sparkling green eyes. His ears are pointed up and forward and his mouth is almost in a wide smile. His pink nose is a much brighter pink now, and his large cheeks are still large, but smaller in comparison.

to be loved is to be changed

19.11.2024 04:50 👍 8950 🔁 1399 💬 173 📌 263

Looking for thoughts on these digital subscriptions. I've subscribed to most of these at some point in the past, but as physical subscriptions.

New York Review of Books
London Review of Books
Times Literary Supplement
LA Review of Books
The New Yorker
Boston Review
n+1
Paris Review

18.11.2024 06:18 👍 3 🔁 0 💬 0 📌 0
Bilbo lies upside down on the coffee table and smiles into the camera, comfy on his blanket. He says "Kiss please!"

Bilbo lies upside down on the coffee table and smiles into the camera, comfy on his blanket. He says "Kiss please!"

kiss pelase !

18.11.2024 00:10 👍 2186 🔁 167 💬 51 📌 4