Ciro Santilli @cirosantilli 40

Not the usual bullshit you were expecting from the philosophy of Science, right?

Some notable quoters:

For parallels between nazi Germany and the cirosantilli.com/china-dictatorship/nazi

As of 2022 visible at: www.nature.com/scitable

Apparently they had a separate URL as just scitable.com, so they were somewhat serious about it before shutting it down.

As of 2022 marked:RIP.

www.nature.com/scitable/blog/student-voices/ has last entry 2015, so presumably that's the shutdown year.

Self description:so quite related to OurBigBook.com.

A series of systems usually derived from the International System of Units that are more convenient for certain applications.

As if Greek letters weren't enough, physicists and mathematicians also like to make up tons of symbols, some of which look like the could actually be Greek letters!

Nabla is one of those: it was completely made up in modern times, and just happens to look like an inverted upper case delta to make things even more confusing!

Nabla means "harp" in Greek, which looks like the symbol.

Lower teens, before discovering more hardcore stuff that is more genial and adult-venerable:So a base mix of what you migth expect from a regular male teenager born in 1989 Brazil.

OK, Ciro still comes back to those from time to time, he confesses. Nostalgia, nostalgia.

The following are also adult venerable though :-)

Wikipedia page: en.wikipedia.org/wiki/List_of_cultural_and_regional_genres_of_music

Once upon a time, this must have been a nice covered market.

But as of 2020, it is completely surrounded by extremely poor people, to the point that it makes you scared if you stand out in any way by showing any kind of middle/upper class wealth, or being a foreigner.

The market is basically a touristic spot that no person in Sao Paulo will ever go to (unless they are young, single, and can just walk in there by themselves) in the middle of this surreal environment.

In 2020 Ciro was there with his wife on a touristic visit. Living in Europe at the time, he felt even more privileged. So they went to a fruit stand, and the man started giving his wife amazing free samples of very exotic fruit, some of which Ciro had never tasted himself, without saying the price. It did feel like he was giving out too much for free. Then Ciro decided of course to buy some more fruits to pay for the show, which was a nice show. Then while buying, it came out a bit more expensive than would have been reasonable, but Ciro was too dazzled by the speed and noises, and he paid for it. Later on, he told his wife about it, and how he felt that they had added some ultra-expensive bulk fruits that were of a clearly lower level than the gold nuggets of the free samples (especially for Brazil's cost standards). The presenter was an extremely crafty con artist, and Ciro felt like they had specifically preyed on Ciro Santilli's self perceived compassionate personality, because it was apparent that those men were underprivileged and fighting for their living day by day with those over-expensive fruits. This was an extremely valuable lesson, Ciro was glad that it was learnt at a relatively low cost on that occasion.

This is particularly important in SQL: Nested set model in SQL, as it is an efficient way to transverse trees there, since querying parents every time would require multiple disk accesses.

The ASCII art visualizations from stackoverflow.com/questions/192220/what-is-the-most-efficient-elegant-way-to-parse-a-flat-table-into-a-tree/194031#194031 are worth reproducing.

As a tree:

As the sets:

Consider the following nested set:

When we want to insert one element, e.g. limit, normally under calculus, we have to specify:so we have a method:

By Tagkopoulos lab at University of California, Davies.