In case anyone else is looking for a topical real-world example of a depth-first traversal of a tree: https://web.archive.org/web/20220908210937/https://www.nytimes.com/interactive/2022/09/08/world/europe/succession-royal-family.html

Instead, I just want you to reflect on this: the safety of your electronic commercial transactions relies on our hope that mathematicians who crack codes can't resist bragging about it!

For a bit more, try this:

(10/n, n = 10)

https://medium.com/@shendreanimish77/cryptography-in-daily-life-e66773fc4aa8

Looked it up (after posting, of course). GBP = GB + P, where P = pound and GB = ISO country code for the UK (https://en.wikipedia.org/wiki/ISO_3166-1_alpha-2#GB). So, it seems the UK reserved both country codes "UK" and "GB", and then went with "GB" for some reason.

The Computational Complexity blog takes on the question of the conference-based publishing culture in computer science, and whether in-person vs virtual vs hybrid conferences can really be said to be working, now that we have enough experience going back and forth between these modalities and the novelty of the virtual and hybrid formats has worn off: http://blog.computationalcomplexity.org/2022/08/conference-modality.html

An elaborate hoax history of medieval Russian history is uncovered on the Chinese-language Wikipedia: https://www.sixthtone.com/news/1010653/she-spent-a-decade-writing-fake-russian-history.-wikipedia-just-noticed.- via https://news.ycombinator.com/item?id=31915937

Link goes to Chinese state media, but is in English; see also the English Wikipedia internal report on the situation, https://en.wikipedia.org/wiki/Wikipedia:Fabricated_articles_and_hoaxes_of_Russia_in_2022

hercules_disappointed.gif

@ColinTheMathmo ln(3) + ln(4) + 5*ln(1) = ln(3 + 4 + 5*1). clearly ln() is linear.

My idea:

Assume intersecting lines are orthogonal curves on the surface. The angle between them in the plane tells you the angle between the surface normal and the view direction; equivalently, it tells you ‖∇z(x,y)‖. Solve the eikonal equation to get z as a function of x and y.

Given a family of lines in the plane that visually resemble a 3D surface, how can you calculate the(?) surface itself?

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Assistant professor of computer science at IIT Delhi.

I'm just here for the TeX.

Joined Dec 2017