Eigenvalues and eigenvectors by Ciro Santilli 35 Updated +Created
Encyclopedia of Math by Ciro Santilli 35 Updated +Created
Originally by Springer, but later moved to the European mathematical society.
ProofWiki by Ciro Santilli 35 Updated +Created
A wiki that gathers mathematical proofs.
MediaWiki-based.
This appears to be the creator: github.com/externl "Joe George".
Covariant derivative by Ciro Santilli 35 Updated +Created
A generalized definition of derivative that works on manifolds.
TODO: how does it maintain a single value even across different coordinate charts?
Backstory by Ciro Santilli 35 Updated +Created
Super Strength by Ciro Santilli 35 Updated +Created
EdX by Ciro Santilli 35 Updated +Created
As of 2022:
  • can't see course material before start date. Once archived, you can see it but requires login...
  • on free mode, limited course access
Fuck that.
Also, they have an ICP.
November 2023 course search:
Udacity by Ciro Santilli 35 Updated +Created
It is a shame that they refocused to more applied courses. This also highlights their highly "managed" approach to content creation. Their 2022 pitch on front page says it all:
for as few as 10 hours a week, you can get the in-demand skills you need to help land a high-paying tech job
they are focused on the highly paid character of many software engineering jobs.
But one cool point of this website is how they hire tutors to help on the courses. This is a very good thing. It is a fair way of monetizing: e-learning websites must keep content free, only charge for certification.
Linear operator by Ciro Santilli 35 Updated +Created
We define it as a linear map where the domain is the same as the image, i.e. an endofunction.
Examples:
Applications of Lie groups to differential equations by Ciro Santilli 35 Updated +Created
Solving differential equations was apparently Lie's original motivation for developing Lie groups. It is therefore likely one of the most understandable ways to approach it.
It appears that Lie's goal was to understand when can a differential equation have an explicitly written solution, much like Galois theory had done for algebraic equations. Both approaches use symmetry as the key tool.
Simple Lie group by Ciro Santilli 35 Updated +Created
Molecular biology by Ciro Santilli 35 Updated +Created
Bibliography:
Lebesgue integral vs Riemann integral by Ciro Santilli 35 Updated +Created
Advantages over Riemann:
Video 1.
Riemann integral vs. Lebesgue integral by The Bright Side Of Mathematics (2018)
Source.
youtube.com/watch?v=PGPZ0P1PJfw&t=808 shows how Lebesgue can be visualized as a partition of the function range instead of domain, and then you just have to be able to measure the size of pre-images.
One advantage of that is that the range is always one dimensional.
But the main advantage is that having infinitely many discontinuities does not matter.
Infinitely many discontinuities can make the Riemann partitioning diverge.
But in Lebesgue, you are instead measuring the size of preimage, and to fit infinitely many discontinuities in a finite domain, the size of this preimage is going to be zero.
So then the question becomes more of "how to define the measure of a subset of the domain".
Which is why we then fall into measure theory!
Intellectual property by Ciro Santilli 35 Updated +Created
Jazz fusion by Ciro Santilli 35 Updated +Created
Ciro's 2020 perfect Friday evening: jazz fusion + study quantum field theory on an Amazon Kindle. Ahhhhhh.
Ciro Santilli's homonyms by Ciro Santilli 35 Updated +Created
If any of you ever read this, do send me an email to Ciro Santilli saying hi and we can agree on a clear separation of usernames.
Although if you are just starting out, maybe you should just go from scratch with a unique Internet alias.
A younger unrelated Argentinian homonym who likes soccer that can be found through Google:Ciro used to like playing soccer too! :-)
www.ancestry.com.au/genealogy/records/ciro-santilli-24-bkmssg documents a "Ciro Santilli" born 31 Jan 1887 at Castelvécchio in Subéquo, L'Aquila, in the Abruzzo region, just like Ciro Santilli's ancestors. Parents Francesco Santilli and Anna Silveri. The page also mentions:
  • Ciro Santilli found in New York, Passenger and Crew Lists (including Castle Garden and Ellis Island), 1820-1957
  • Ciro Santilli found in Oregon, Naturalization Records 1865-1991
Hindi by Ciro Santilli 35 Updated +Created
Important discrete mathematical group by Ciro Santilli 35 Updated +Created

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