The summary from www.geeksforgeeks.org/tree-traversals-inorder-preorder-and-postorder/ is a winner:

In principle one could talk about tree traversal of unordered trees as a number of possible traversals without a fixed order. But we won't consider that under this section, only deterministic ordered tree traversals.

First major one: Magic: The Gathering.

Ciro thinks this is idiotic, and that Wizards should sell all cards individually with unlimited supply and all with the same prices, especially online where there are no printing costs. But because Wizards made the silly promise never to reprint certain cards with the reserved list in 1994, they can't even correct this mistake legally! (TODO maybe, see further discussion at: www.mtggoldfish.com/articles/contract-from-below-promissory-estoppel-and-the-reserved-list). There is however one simple solution: create and promote a new no reserve list format, and let reserve list formats rot away:One interesting outcome of this would be to have card cost limited formats. Penny Dreadful puts a super low limit, on individual cards, but it would be cool to have a max cost per deck version of it.

A cool thing is when they printed Garth One-Eye, which allows you to make imaginary copies of some of those restricted list cards during play. This is the type of "flirting with the rules", that Ciro Santilli admires. The introduction of online-only cards such as XXX has pushed that even further as of 2021.

This was especially insane when Ciro was young and the Internet was not very widely available in Brazil yet, and Ciro did not know how to check the values of cards on online markets, and would trade cards with older much more knowledgable teenagers, based solely on his appraisal of a card's strength! Can you imagine how many young Timmys got ripped off in this manner, trading useless one million mana spells for ultra expensive black lotuses?

Another option we could pursue would be to make governments consider TCG pack opening a form of gambling, which it obviously is:

There is however one good solution to Magic's insane cost: watch people who have nothing better to do in their lives play on YouTube.

And as Internet formats dominate more and more, if they have any brains at will they will migrate to a subscription model where you pay to play for a given period of time, and have immediate access to all cards. It could even be a tiered access, with older formats being more expensive (more bugs to fix on different cards), but you must get access to all cards of a format at once.

This is the order in which a binary search tree should be traversed for ordered output, i.e.:

This ordering makes sense for binary trees and not k-ary trees in general because if there are more than two nodes it is not clear what the top node should go in the middle of.

This is unlike pre-order depth-first search and post-order depth-first search which generalize obviously to general trees.

As mentioned at Human Compatible by Stuart J. Russell (2019), game theory can be seen as the part of artificial intelligence that deas with scenarios where multiple intelligent agents are involved.

The best example to look at first is the penalty kick left right Nash equilibrium.

Then, a much more interesting example is choosing a deck of a TCG competition: Magic: The Gathering meta-based deck choice is a bimatrix game, which is the exact same, but each player has N choices rather than 2.

The next case that should be analyzed is the prisoner's dilemma.

The key idea is that:

Magic: The Gathering meta-based deck choice is a bimatrix game.

Poet, scientists and warriors all in one? Conquerors of the useless.

A wise teacher from University of São Paulo once told the class Ciro Santilli attended an anecdote about his life:It turned out that, about 10 years later, Ciro ended up following this advice, unwittingly.

Ciro once read that there are two types of mathematicians/scientists (he thinks it was comparing Einstein to some Jack of all trades polymath who didn't do any new discoveries):

TODO long after Ciro forgot where he had read this from originally, someone later pointed him to: www.ams.org/notices/200902/rtx090200212p.pdf Birds and Frogs by Freeman Dyson (2009), which is analogous but about Birds and Frogs. So did Ciro's memory play a trick on him, or is there also a variant; of this metaphor with a gopher?

Ciro is without a doubt the bird type. Perhaps the ultimate scientist is the one who can combine both aspects in the right amount?

Ciro gets bored of things very quickly.

Once he understands the general principles, if the thing is not the next big thing, Ciro considers himself satisfied without all the nitty gritty detail, and moves on to the next attempt.

In the field of mathematics for example, Ciro is generally content with understanding cool theorem statements. More generally, one of Ciro's desires is for example to understand the significance of each physics Nobel Prize.

This is also very clear for example after Ciro achieved Linux Kernel Module Cheat: he now had the perfect setup to learn all the Linux kernel shady details but at the same time after all those years he finally felt that "he could do it, so that was enough", and soon moved to other projects.

If Ciro had become a scientist, he would write the best review papers ever, just like in the current reality he writes amazing programming tutorials on Stack Overflow.

Ciro has in his mind an overly large list of subjects that "he feels he should know the basics of", and whenever he finds something in one of those topics that he does not know enough about, he uncontrollably learns it, even if it is not the most urgent thing to be done. Or at least he puts a mention on his "list of sources" about the subject. Maybe everyone is like that. But Ciro feels that he feels this urge particularly strongly. Correspondingly, if a subject is not in that list, Ciro ignores it without thinking twice.

Ciro believes that high flying birds are the type of people better suited for venture capital investment management: you know a bit of what is hot on several fields to enough depth to decide where to place your bets and how to guide them. But you don't have the patience to actually go deeply into any one of them and deal with each individual shit that comes up.

Cosmos: A Personal Voyage (1980) episode 1 mentions as quoted by the Wikipedia page for Eratosthenes:That's Ciro.

Some related ideas:

This dude looks like a God. Ciro Santilli does not understand his stuff, but just based on the names of his theories, e.g. "Yoga of anabelian algebraic geometry", and on his eccentric lifestyle, it is obvious that he was in fact a God.