Ciro Santilli @cirosantilli 40

Some specific examples:

Once the ball starts rolling, these are people who should be contacted.

Basically anything under educational charitable organization counts.

It is also worth having a look under the Wikipedia page for open educational resources: en.wikipedia.org/wiki/Open_educational_resources

These videos can give some geometric insight and do have their value.

But they are sometimes too slow, there are never any mention of experiments, just "the truth".

And when things get "mathy", it sticks to a more qualitative view which may not be enough.

Very over the top with sexy demons and angels making appearances, and has some classic aesthetic artistic value :-)

The central theme of The Matrix (1999).

The Wikipedia page of this article is basically a masterclass why Wikipedia is useless for learning technical subjects. They are not even able to teach such a simple subject properly there!

Bibliography:

See also some remarks of Ciro Santilli's thoughts on the instrument Ciro Santilli's musical education.

$T^{(m,n)}$ has order $(m,n)$