Ciro Santilli @cirosantilli 35

Group of rotations of a rigid body.

Like orthogonal group but without reflections. So it is a "special case" of the orthogonal group.

This is a subgroup of both the orthogonal group and the special linear group.

Active compound in pepper.

A more precise term for those in the know: open source software that also has a liberal license, for some definition of liberal.

Ciro Santilli defines liberal as: "can be commercialized without paying anything back" (but possibly subject to other restrictions).

He therefore does not consider Creative Commons licenses with NC to be FOSS.

For the newbs, the term open source software is good enough, since most open source software is also FOSS.

But when it's not, it's crucial to know.

Ciro Santilli can accept closed source on server products more easily than offline, because the servers have to be paid for somehow (by stealing your private data).

Nutrient that a given species cannot produce and must ingest in its diet.

The speed of neutrons greatly influences how well they are absorbed by different isotopes.

Bibliography:

Does not have any non-trivial normal subgroup.

And therefore, going back to our intuition that due to the fundamental theorem on homomorphisms there is one normal group per homomorphism, a simple group is one that has no non-trivial homomorphisms.

Some notable examples: