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Posts by Bjørn Kjos-Hanssen

How about a sentence?
A bi cat, dark eagle friend, glanced homeward illegally.

2 months ago 0 0 1 0

I could come up with all kinds of strange contracts and then claim that "in some sense this is 8% interest!"

A particularly egregious example is "annual rest" whereby payments made monthly throughout the year only start to earn interest at the end of the year 🙄

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4 months ago 0 0 0 0

I used to think that nominal interest was a great way to introduce the number e. But after teaching a class on this stuff, now I feel like nominal interest is mostly just a socially constructed way to say the interest rate is say 8% when it's really not!
🧵
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4 months ago 1 0 1 0

If f and g are automorphisms of a partial order L, and a ≤ f(b) and b ≤ g(a) ... then is there an automorphism sending a to b?
(I know the answer but am curious what arguments/examples others may have. Caution: it's too hard for ChatGPT!)

1 year ago 0 0 0 0

I've always heard it referred to as simply "product".

1 year ago 0 0 1 0

If you don't know me, I'm 9, where m=3 and b=2

1 year ago 0 0 0 0
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Ask not what this is --- ask "what is this knot?"

1 year ago 0 0 0 0
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An "attractive" red cube in the middle of this polymer.

1 year ago 1 0 0 0
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An example of the nonmonotonicity of optimal protein folding in the hydrophobic-polar model!

1 year ago 1 0 0 0
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Here's an example of my online game Labbyfold. Fold proteins into their optimal configuration! math.hawaii.edu/~bjoern/?she...

1 year ago 0 0 0 0
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Picture... or it didn't happen? 🙂

1 year ago 0 0 1 0
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I forget the proper terminology! But the DFA is shown below. The alphabet is {0,1}. Reading 000 you go in a 3-cycle from q₀ to q₀. Given this you can fill in all edge labels. The big diagram above indicates that states (q₀,q₁,q₂) go to (q₁,q₂,q₀) when reading a 0, by having an arrow from 012 to 120.

1 year ago 0 0 1 0
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Thanks --- here's a monoid from my book!

1 year ago 0 0 1 0
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🍿

2 years ago 2 0 0 0

I kept hearing about "logical depth" so I gave in and wrote a paper about it.
math.hawaii.edu/~bjoern/logical-depth-knapsack.pdf

2 years ago 1 0 0 0

UNIQUE SUBSET SUM is coNP-hard. Reference?

2 years ago 7 0 0 0

They have different types so they can't be compared as = or not =.

2 years ago 0 0 0 0
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No, sorry.

2 years ago 0 0 0 0