Ciro Santilli @cirosantilli 40

Subset of recursively enumerable language as explained at: difference between recursive language and recursively enumerable language.

www.ibiblio.org/chinese-music/html/traditional.html contains an amazing orchestral version for di flute TODO identify! When attempting to upload to YouTube, it identifies as "Su Wu Tending the Sheep" and give a name "Chen Tao", but no further information. Chen Tao is presumably this dude: www.barduschinamusic.org/chen-tao-dizi | www.melodyofdragon.org/chentao.html 陈涛

baike.baidu.com/item/苏武牧羊/5532#11_2 mentions that it comes from an erhu concerto composed by Peng Xiuwen

The sadness of the erhu perfectly fits the role and mood of the story! Brilliant!

Can be contrasted with baryons as mentioned at baryon vs meson vs lepton.

Nope, it is not a Greek letter, notably it is not a lowercase delta. It is just some random made up symbol that looks like a letter D. Which is of course derived from delta, which is why it is all so damn confusing.

I think the symbol is usually just read as "D" as in "d f d x" for $\frac{\partial F(x,y,z)}{\partial x}$.

Set of eigenvalues of a linear operator.

Basically a synonym for doing a large chunk of de novo DNA synthesis.

Discrete quantum system model that can model both spin in the Stern-Gerlach experiment or photon polarization in polarizer.

Also known in quantum computing as a qubit :-)

Vitamins are essential nutrients that are small organic compounds.

Mentioned at 100 Greatest Discoveries by the Discovery Channel (2004-2005) medicine episode.