Search for extraterrestrial intelligence Updated +Created
Gravity wave Updated +Created
Gravity Updated +Created
In 2020 physics, best explained by general relativity.
TODO: does old Newtonian gravity give different force results than general relativity?
Zeta (letter) Updated +Created
Lower case looks like the mouth shape when you say Z, with mouth open, and you can even see the little tongue going down. Beauty.
Psi (Greek) Updated +Created
As if it weren't enough, there's also a Cyrillic script psi that is slightly different. Life's great.
The Final Encyclopedia (Paul Allen) Updated +Created
The Google Story Chapter 21. A Virtual Library mentions that Paul Allen was interested in trying to create something like the "Final Encyclopedia" from this book. This is somewhat the same motivation for Google Books and Google's activities more broadly, as shown in their organise the world's information mission statement.
Finite field Updated +Created
A convenient notation for the elements of of prime order is to use integers, e.g. for we could write:
which makes it clear what is the additive inverse of each element, although sometimes a notation starting from 0 is also used:
For fields of prime order, regular modular arithmetic works as the field operation.
For non-prime order, we see that modular arithmetic does not work because the divisors have no inverse. E.g. at order 6, 2 and 3 have no inverse, e.g. for 2:
we see that things wrap around perfecly, and 1 is never reached.
For non-prime prime power orders however, we can find a way, see finite field of non-prime order.
Video 1.
Finite fields made easy by Randell Heyman (2015)
Source. Good introduction with examples
IP stack fingerprinting Updated +Created
Counter-Strike Updated +Created
Quadratically closed field Updated +Created
Gold leaf Updated +Created
Video 1.
Hands: A Dublin Bookbinder
. Source. Some awesome gold leaf action!
Graphviz example Updated +Created
Epsilon (letter) Updated +Created
Confusingly, in LaTeX:
  • \varepsilon rendered , is the default modern Greek glyph
  • \epsilon rendered is the lunate variant
Hamilton's equations Updated +Created
Analogous to what the Euler-Lagrange equation is to Lagrangian mechanics, Hamilton's equations give the equations of motion from a given input Hamiltonian:
So once you have the Hamiltonian, you can write down this system of partial differential equations which can then be numerically solved.
Poisson bracket Updated +Created
List of image file formats Updated +Created
Natural units Updated +Created
A series of systems usually derived from the International System of Units that are more convenient for certain applications.
Ramadan Updated +Created
Ciro Santilli appreciates this concept of "remembering the suffering of others" a lot due to Ciro Santilli's self perceived compassionate personality and Ciro Santilli's cheapness.

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