Ciro Santilli @cirosantilli 40

A positive definite matrix that is also a symmetric matrix.

They do have some really good ones.

It is interesting that in different episodes they often switch the dominant/passive roles, so it's not fixed as in Laurel and Hardy.

Every mammal except the weird monotremes, i.e. marsupials and the placentalia.

The name is completely random, "wild beast". Are platypuses not "wild beasts"? They have a freaking poison!!

One of its main applications is to determine the 3D structure of proteins.

Sometimes you are not able to crystallize the proteins however, and the method cannot be used.

Crystallizing is not simple because:

Cryogenic electron microscopy can sometimes determine the structures of proteins that failed crystallization.

Communicating at a distance, from Greek "tele" for distance!

A very cool thing about telecommunication is, besides how incredibly fast it advanced (in this sense it is no cooler than integrated circuit development), how much physics and information theory is involved in it. Applications of telecommunication implementation spill over to other fields, e.g. some proposed quantum computing approaches are remarkably related to telecommunication technology, e.g. microwaves and silicon photonics.

This understanding made Ciro Santilli wish he had opted for telecommunication engineering when he was back in school in Brazil. For some incomprehensible reason, telecommunications was the least competitive specialization in the electric engineering department at the time, behind even power electronics. This goes to show both how completely unrelated to reality university is, and how completely outdated Brazil is/was. Sad stuff.

Ciro Santilli just keep watching that a gazillion times whenever it showed on TV.

All action scenes are useless crap, but the premise with Ciro's precious simulation hypothesis subject, related physics and the illusion of life.

It is a shame that the key premise of using human bodies to produce energy is completely and impossibly stupid. You would obviously get more energy by directing burning the food you feed into humans.

If the film had been made later, maybe the much more plausible concept of AI alignment would would have been used instead. What a shame.

Website: www.theoremoftheday.org/

To see that the real projective plane is not simply connected space, considering the lines through origin model of the real projective plane, take a loop that starts at $(1,0,0)$ and moves along the $y=0$ great circle ends at $(-1,0,0)$.

Note that both of those points are the same, so we have a loop.

Now try to shrink it to a point.

There's just no way!

20k genes, 3 billion base pairs. We can handle this!!!