Deriving magnetism from electricity and relativity Updated 2025-07-16
It appears that Maxwell's equations can be derived directly from Coulomb's law + special relativity:
This idea is suggested by the charged particle moving at the same speed of electrons thought experiment, which indicates that magnetism is just a consenquence of special relativity.
Why moving charges produce magnetic field? by FloatHeadPhysics (2022)
Source. Nash equilibrium Updated 2025-07-16
The best example to look at first is the penalty kick left right Nash equilibrium.
Then, a much more interesting example is choosing a deck of a TCG competition: Magic: The Gathering meta-based deck choice is a bimatrix game, which is the exact same, but each player has N choices rather than 2.
The next case that should be analyzed is the prisoner's dilemma.
The key idea is that:
- imagine that the game will be played many times between two players
- if one player always chooses one deck, the other player will adapt by choosing the anti-deck
- therefore, the best strategy for both players, is to pick decks randomly, each with a certain probability. This type of probabilistic approach is called a mixed strategy
- if any player deviates from the equilibrium probability, then the other player can add more of the anti-deck to the deck that the other player deviated, and gain an edgeTherefore, using equilibrium probabilities is the optimal way to play
Natural language processing Updated 2025-07-16
An impossible AI-complete dream!
It is impossible to understand speech, and take meaningful actions from it, if you don't understand what is being talked about.
Deterministic perfect information board game Updated 2025-07-16
Developmental genetics Updated 2025-07-16
How genes form bodies.
Developmental Genetics 1 by Joseph Ross (2020)
Source. Talks about homeobox genes. Dharma name Updated 2025-07-16
Diamond Sutra Updated 2025-07-16
Difference between recursive language and recursively enumerable language Updated 2025-07-16
Differentiable manifold Updated 2025-07-16
Diffie-Hellman key exchange Updated 2025-07-16
Based on the fact that we don't have a P algorithm for the discrete logarithm of the cyclic group as of 2020, but we do have an efficient algorithm for modular exponentiation. But nor do we have proof that one does not exist! Living on the edge as usual for public-key cryptography.
Diffraction of Cathode Rays by a Thin Film by Thomson and Reid (1927) Updated 2025-07-16
Digital electronic circuit Updated 2025-07-16
Digital Light Processing Updated 2025-07-16
Dimension Updated 2025-07-16
Diophantine equation Updated 2025-07-16
Sometimes systems of Diophantine equations are considered.
Problems generally involve finding integer solutions to the equations, notably determining if any solution exists, and if infinitely solutions exist.
The general problem is known to be undecidable: Hilbert's tenth problem.
The Pythagorean triples, and its generalization Fermat's last theorem, are the quintessential examples.
NCBI open reading frame tool Updated 2025-07-16
NCBI online tool to find and view all open reading frames in a given FASTA: www.ncbi.nlm.nih.gov/orffinder/
NeoCarbonFood Updated 2025-07-16
Previously known as "Food From Electricity", "NeoCarbonFood" sounds like a more commercializable version of it.
Uses electricity to electrolyse water into hydrogen and oxygen molecules, and then use bacteria that do hydrogen chemosynthesis to convert it into food.
Dirac Lagrangian Updated 2025-07-16
where:
Remember that is a 4-vetor, gamma matrices are 4x4 matrices, so the whole thing comes down to a dot product of two 4-vectors, with a modified by matrix multiplication/derivatives, and the result is a scalar, as expected for a Lagrangian.
Like any other Lagrangian, you can then recover the Dirac equation, which is the corresponding equations of motion, by applying the Euler-Lagrange equation to the Lagrangian.
Directional derivative Updated 2025-07-16
Dirichlet boundary condition Updated 2025-07-16
Specifies fixed values.
Can be used for elliptic partial differential equations and parabolic partial differential equations.
Numerical examples:
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