Type of semiconductor by Ciro Santilli 35 Updated +Created
Rust (video game) by Ciro Santilli 35 Updated +Created
The brutality of this game, the fact that you can get killed at any point, and all players accept that, is awesome.
Italian (language) by Ciro Santilli 35 Updated +Created
Roguelike by Ciro Santilli 35 Updated +Created
Works about Richard Feynman by Ciro Santilli 35 Updated +Created
Potentiometer by Ciro Santilli 35 Updated +Created
General relativity by Ciro Santilli 35 Updated +Created
Unifies both special relativity and gravity.
Not compatible with the Standard Model, and the 2020 unification attempts are called theory of everything.
One of the main motivations for it was likely having forces not be instantaneous, but rather mediated by field to maintain the principle of locality, just like electromagnetism did earlier.
Synthetic geometry of the real projective plane by Ciro Santilli 35 Updated +Created
It good to think about how Euclid's postulates look like in the real projective plane:
Unlike the real projective line which is homotopic to the circle, the real projective plane is not homotopic to the sphere.
The topological difference bewteen the sphere and the real projective space is that for the sphere all those points in the x-y circle are identified to a single point.
One more generalized argument of this is the classification of closed surfaces, in which the real projective plane is a sphere with a hole cut and one Möbius strip glued in.
Visualizing 4D by Ciro Santilli 35 Updated +Created
Simulate it. Just simulate it.
Video 1.
4D Toys: a box of four-dimensional toys by Miegakure (2017)
Source.
Normal subgroup by Ciro Santilli 35 Updated +Created
Only normal subgroups can be used to form quotient groups: their key definition is that they plus their cosets form a group.
One key intuition is that "a normal subgroup is the kernel" of a group homomorphism, and the normal subgroup plus cosets are isomorphic to the image of the isomorphism, which is what the fundamental theorem on homomorphisms says.
Therefore "there aren't that many group homomorphism", and a normal subgroup it is a concrete and natural way to uniquely represent that homomorphism.
The best way to think about the, is to always think first: what is the homomorphism? And then work out everything else from there.
History of quantum mechanics bibliography by Ciro Santilli 35 Updated +Created
Planck-Einstein relation by Ciro Santilli 35 Updated +Created
Photon energy is proportional to its frequency:
or with common weird variables:
This only makes sense if the photon exists, there is no classical analogue, because the energy of classical waves depends only on their amplitude, not frequency.
Quantum computing by Ciro Santilli 35 Updated +Created
Quantum is getting hot in 2019, and even Ciro Santilli got a bit excited: quantum computing could be the next big thing.
No useful algorithm has been economically accelerated by quantum yet as of 2019, only useless ones, but the bets are on, big time.
To get a feeling of this, just have a look at the insane number of startups that are already developing quantum algorithms for hardware that doesn't/barely exists! quantumcomputingreport.com/players/privatestartup (archive). Some feared we might be in a bubble: Are we in a quantum computing bubble?
To get a basic idea of what programming a quantum computer looks like start by reading: Section "Quantum computing is just matrix multiplication".
Some people have their doubts, and that is not unreasonable, it might truly not work out. We could be on the verge of an AI winter of quantum computing. But Ciro Santilli feels that it is genuinely impossible to tell as of 2020 if something will work out or not. We really just have to try it out and see. There must have been skeptics before every single next big thing.
American politician by Ciro Santilli 35 Updated +Created
Polish letter by Ciro Santilli 35 Updated +Created
Ludic Science by Ciro Santilli 35 Updated +Created
Maybe Spanish accent, but might also be from some other european language.
Very practical, low-cost experiments.
Alan Watts controlled dream of life talk by Ciro Santilli 35 Updated +Created
Goes along: if you could control your life multiple times to be perfect, you would eventually get tired of paradise, and you would go further and further into creating uncertain worlds with some suffering, until you would reach the current real world.
Very similar to The Matrix (1999) when Agent Smith talks about the failed Paradise Matrix shown at www.youtube.com/watch?v=9Qs3GlNZMhY:
Did you know that the first Matrix was designed to be a perfect human world where none suffered, where everyone would be happy? It was a disaster. No one would accept the program. Entire crops were lost. Some believed that we lacked the programming language to describe your "perfect world". But I believe that, as a species, human beings define their reality through misery and suffering. So the perfect world was a dream that your primitive cerebrum kept trying to wake up from.

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