Ciro Santilli @cirosantilli 37

Databases and projects:

Because of edit wars and encyclopedic tone requirements. See also: Wikipedia.

Thus OurBigBook.com.

Considering e.g. Newton's laws of motion, you take a system that is a function of time $f(t)$, e.g. the position of many point particles, and then you reverse the speeds of all particles, then $f(-t)$ is a solution to that.

The complex analogue of the special orthogonal group, i.e. the subgroup of the unitary group with determinant equals exactly 1 instead of an arbitrary complex number with absolute value equal 1 as is the case for the unitary group.

I guess you also have to change the sign of the gravitational constant?

There are only boring examples of taking an uncomputable language and converting it into a number?

One of the most simple to state undecidable problems.

The reason that it is undecidable is that you can repeat each matrix any number of times, so there isn't a finite number of possibilities to check.

Sequence of genes under a single promoter. For an example, see E. Coli K-12 MG1655 operon thrLABC.

A single operon may produce multiple different transcription units depending on certain conditions, see: operon vs transcription unit.

Anything that is not in the Pali Canon has basically zero chance of having come from Buddha or his immediate followers.