Navier-Stokes equations by Ciro Santilli 35 Updated +Created
Doom (video game) by Ciro Santilli 35 Updated +Created
GF(2) by Ciro Santilli 35 Updated +Created
Ranger (file manager) by Ciro Santilli 35 Updated +Created
Ciro Santilli considered it before he stopped using file managers altogether, it is not bad.
Exponential function differential equation by Ciro Santilli 35 Updated +Created
The differential equation that is solved by the exponential function:
with initial condition:
TODO find better name for it, "linear homogenous differential equation of degree one" almost fully constrainst it except for the exponent constant and initial value.
Uniqueness by Ciro Santilli 35 Updated +Created
Ideal gas law by Ciro Santilli 35 Updated +Created
Hermann Hauser by Ciro Santilli 35 Updated +Created
Divergence in Einstein notation by Ciro Santilli 35 Updated +Created
First we write a vector field as:
Note how we are denoting each component of as with a raised index.
Then, the divergence can be written in Einstein notation as:
It is common to just omit the variables of the function, so we tend to just say:
or equivalently when referring just to the operator:
Calibre (software) by Ciro Santilli 35 Updated +Created
Sometimes Ciro Santilli says half jokingly that user interface does not matter.
This software circa 2010-2020 makes that joke not be funny.
How can a UI feel so clunky!
The most aggravating thing is that it is not immediately obvious why it feels so bad.
Dual vector by Ciro Santilli 35 Updated +Created
Dual vectors are the members of a dual space.
In the context of tensors , we use raised indices to refer to members of the dual basis vs the underlying basis:
The dual basis vectors are defined to "pick the corresponding coordinate" out of elements of V. E.g.:
By expanding into the basis, we can put this more succinctly with the Kronecker delta as:
Note that in Einstein notation, the components of a dual vector have lower indices. This works well with the upper case indices of the dual vectors, allowing us to write a dual vector as:
In the context of quantum mechanics, the bra notation is also used for dual vectors.
All but dissertation by Ciro Santilli 35 Updated +Created
DNA replication by Ciro Santilli 35 Updated +Created
Epigenetics by Ciro Santilli 35 Updated +Created
Genetic code by Ciro Santilli 35 Updated +Created
Horizontal gene transfer by Ciro Santilli 35 Updated +Created
Ways in which it can happen:
Figure 1.
Graph of life
. Source. horizontal gene transfer transforms the tree of life into the graph of life! Fuck my life.
Digital electronic circuit by Ciro Santilli 35 Updated +Created

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