Overdetermination of Maxwell's equations by Ciro Santilli 35 Updated +Created
As seen from explicit scalar form of the Maxwell's equations, this expands to 8 equations, so the question arises if the system is over-determined because it only has 6 functions to be determined.
As explained on the Wikipedia page however, this is not the case, because if the first two equations hold for the initial condition, then the othe six equations imply that they also hold for all time, so they can be essentially omitted.
It is also worth noting that the first two equations don't involve time derivatives. Therefore, they can be seen as spacial constraints.
TODO: the electric field and magnetic field can be expressed in terms of the electric potential and magnetic vector potential. So then we only need 4 variables?
Feces by Ciro Santilli 35 Updated +Created
De Broglie-Bohm theory by Ciro Santilli 35 Updated +Created
Deterministic, but non-local.
Plausible deniability of email password handover by Ciro Santilli 35 Updated +Created
You need a secondary password that when used leads to an empty inbox with a setting set where message are deleted after 2 days.
This way, if the attacker sends a test email, it will still show up, but being empty is also plausible.
Of course, this means that any new emails received will be visible by the attacker, so you have to find a way to inform senders that the account has been compromised.
So you have to find a way to inform senders that the account has been compromised, e.g. a secret pre-agreed canary that must be checked each time as part of the contact protocol.
Model of elliptic geometry by Ciro Santilli 35 Updated +Created
Lepton by Ciro Santilli 35 Updated +Created
Can be contrasted with baryons as mentioned at baryon vs meson vs lepton.
Electromagnetic tensor by Ciro Santilli 35 Updated +Created
Frame of reference by Ciro Santilli 35 Updated +Created
Open Knowledge Foundation by Ciro Santilli 35 Updated +Created
Teach For All by Ciro Santilli 35 Updated +Created
Short-read DNA sequencing by Ciro Santilli 35 Updated +Created
Fog computing by Ciro Santilli 35 Updated +Created
Our definition of fog computing: a system that uses the computational resources of individuals who volunteer their own devices, in which you give each of the volunteers part of a computational problem that you want to solve.
Folding@home and SETI@home are perfect example of that definition.
Antimatter by Ciro Santilli 35 Updated +Created
Predicted by the Dirac equation.
Can be easily seen from the solution of Equation "Expanded Dirac equation in Planck units" when the particle is at rest as shown at Video "Quantum Mechanics 12b - Dirac Equation II by ViaScience (2015)".
Klein-Gordon equation by Ciro Santilli 35 Updated +Created
A relativistic version of the Schrödinger equation.
Correctly describes spin 0 particles.
The most memorable version of the equation can be written as shown at Section "Klein-Gordon equation in Einstein notation" with Einstein notation and Planck units:
Has some issues which are solved by the Dirac equation:
Cryogen-free dilution refrigerator by Ciro Santilli 35 Updated +Created
Developmental genetics by Ciro Santilli 35 Updated +Created
How genes form bodies.
Video 1.
Developmental Genetics 1 by Joseph Ross (2020)
Source. Talks about homeobox genes.
When viewed as matrices, it is the group of all matrices that preserve the dot product, i.e.:
This implies that it also preserves important geometric notions such as norm (intuitively: distance between two points) and angles.
This is perhaps the best "default definition".

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