gilleain

16 ms·

211.
by gilleain 2y ago
Good writeup of 'Combinatorial coordinates for the aperiodic Spectre tiling' from Simon Tatham here : https://www.chiark.greenend.org.uk/~sgtatham/quasiblog/aperi...
212.
by gilleain 2y ago
So a physics stack exchange question ( https://physics.stackexchange.com/questions/221440/space-gro... ) led me to a paper ( https://nvlpubs.nist.gov/nistpubs/jres/107/4/j74mig.pdf
213.
by gilleain 2y ago
There is Prof. Felix Flicker's research in 'Hamiltonian Cycles on Ammann Beenker Tilings' which is relevant I think. https://www.felixflicker.com/research
214.
by gilleain 2y ago
Seems quite possible, but the difficulty would be why one enantiomer is less favourable than the other. Totally agree that it is hard to test these things experimentally, or through historical analysis of structural remnants. I understand t
215.
by gilleain 2y ago
Yes, I wonder how the responses would be to "Describe Gul Dukat to someone who doesn't know him"
216.
by gilleain 2y ago
Yes, from the Discussion section of the paper: > Prior work even finds that celebrities that generate common ground between strangers are disproportionately discussed in conversation, suggesting shared celebrity knowledge can provide a “
217.
by gilleain 2y ago
I thought they were saying they _had_ heard of 8 in 10? Strangely Karol G was also new to me. I'll resist searching for the name - I enjoy not knowing things sometimes.
218.
by gilleain 2y ago
Indeed, I struggle to even imagine what "use unusual language when describing well-known celebrities" even means! Maybe like using "musician" rather than "artist" or some other combination? edit: Ok, I've
219.
by gilleain 2y ago
So a couple of things i remember from back in the old structural bioinformatics days... Firstly, there are naturally occurring mixed-chirality (alternating) peptides. They are usually circular iirc. Secondly, no you can't really have l
220.
by gilleain 2y ago
There were a few English artists who might have had the opportunity of knowing what they looked like, given there were lions at the Tower of London: https://en.wikipedia.org/wiki/Tower_of_London "Records of 1210–1
221.
by gilleain 2y ago
So an arbitrary ideal, then? As in, not conforming to 'the' ideal in the sense of some platonic, eternal idea of a cow, but some ideal in the mind of farmers of what they would prefer cows to be.
222.
by gilleain 2y ago
I agree, however there is something to be said for the distance between the subject and the representation. If the 'underlying cow' is already somewhat square, then the representation in painting or photo is going to be close to t
223.
by gilleain 2y ago
It's from https://knowyourmeme.com/memes/brother-may-i-have-some-oats (I only learned of the meme recently, not from the original)
224.
by gilleain 2y ago
Bröther, may I have some oats! edit : Ah, in fact that painting is in the article at the very end : "A Pair of Pigs Image credit: Compton Verney"
225.
by gilleain 2y ago
Ok, and if I asked a random member of the public for the name of a mathematician (excepting Turing, for clarity) what name do you think they would come up with? Pythagoras? Euler? Erdős? I think the reality is that only a very small number
226.
by gilleain 2y ago
So this comes up a lot. I often think about the case of protein structures. Let's consider a protein of 100 amino acids; although most proteins are in the 200-500 range (IIRC) it makes the maths simpler. Even for such a short sequence,
227.
by gilleain 2y ago
The mechanism for selecting between metal ions with different charges (or valencies - monovalent is 1+, divalent is 2+) is interesting. The article mentions the analogy to biological systems, and I remember talking to a Professor (sadly now
228.
by gilleain 2y ago
So I have two recommendations: Samira Mian, her youtube channel is: https://www.youtube.com/user/samiramian Another book (!) by Eric Broug - 'Islamic Geometric Patterns' that has step-by-step instructions for
229.
by gilleain 2y ago
Yes, I started about 4 years ago (in my mid 40s) just putting watercolour onto paper - like stick trees, really the absolute basics. I moved on to reproducing patterns in pencil (Islamic tiling designs, celtic knots, etc) as something to pu
230.
by gilleain 2y ago
David Baker (and colleagues) have always done good work. I guess google have done some things also. (lol - one of the PDF attachments to that page is 'Illustration: A string of amino acids' : actually it's a bit better than t
231.
by gilleain 2y ago
I'm not sure how jigsaws are usually modelled in maths. I feel like there should be a graph model? Perhaps each piece could be labelled and have 'dangling' half-edges that are coloured such that they can only be connected to
232.
by gilleain 2y ago
Why would salt be a problem? There are single celled organisms known as halophiles that survive extreme salt. Do you know what range of concentrations are reasonable for life, or which salts might be present on Europa?
233.
by gilleain 2y ago
Indeed. Related is the Ammann-Beenker tiling and it's connections to the 'Silver Ratio' of sqrt(2) + 1. * https://en.wikipedia.org/wiki/Silver_ratio * https://en.wikipedia.org/wiki/A
234.
by gilleain 2y ago
How many s's are in Mississipi?
235.
by gilleain 2y ago
Chemistry does ring finding in various ways. I've always liked the SSSR (smallest set of smallest rings) just for the name :) https://depth-first.com/articles/2020/08/31/a-smallest-set-o...
236.
by gilleain 2y ago
I remember being very pleased when I figured out a quick way to draw a ribbon helix! Richardson's diagrams are so much nicer though. Especially the twisted parallel beta sheet (the a-b-a sandwich) on the right hand side of the three im
237.
by gilleain 2y ago
Might depend on what your measure of 'novelty' is in protein structure. A single residue change (for example) would not normally be considered a novel structure - it's just a mutation. However, a new fold - that is, the shape
238.
by gilleain 2y ago
from the wiki page: "Zeckendorf's theorem states that every positive integer can be represented uniquely as the sum of one or more distinct Fibonacci numbers in such a way that the sum does not include any two consecutive Fibonacc
239.
by gilleain 2y ago
Wildly? I'm sure the code might be inefficient in many ways, but there have (as I understand) been performance improvements such as in chunk loading and map generation. Even the latest (apparently controversial) recent redstone update
240.
by gilleain 2y ago
oops. shouldn't try 'research' on my phone. thanks. Incidentally, I'm sure it used to be possible to google search using InChI. Even using the InChI-Key now doesn't work super well it seems. I have to quote it to ge

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