Circulatory system

{disambiguate=trope}

https://tvtropes.org/pmwiki/pmwiki.php/Main/EverybodyWasKungFuFighting


Everybody Was Kung-Fu Fighting

Everybody Was Kung-Fu Fighting (trope)

{wiki}

The <group (mathematics)> of all transformations that preserve some <bilinear form>, notable examples:
* <orthogonal group> preserves the <inner product>
* <unitary group> preserves a <Hermitian form>
* <Lorentz group> preserves the <Minkowski inner product>


Isometry group

{title2=4.2 K}
{wiki}

= Helium I
{synonym}
{title2}

4 K. Enough for to make "low temperature <superconductors>" like regular metals superconducting, e.g. the <superconducting temperature of aluminum> if 1.2 K.

Contrast with <liquid nitrogen>, which is much cheaper but only goes to 77K.


Liquid helium

Novel result

Park Tool

{wiki}

= Patented
{synonym}

\Image[https://web.archive.org/web/20230121100526/https://patentimages.storage.googleapis.com/2d/d5/b5/ecd3eb157a4087/US06293874-20010925-D00000.png]
{title=User-operated amusement apparatus for kicking the user's buttocks figure 5}
{source=https://patents.google.com/patent/US6293874B1/en}


Patent

Rust library

{tag=Crystallography}
{wiki}

All possible repetitive crystal structures!

219 of them.


Space group

{title2=$SL(n)$}
{wiki}

Specials sub case of the <general linear group> when the determinant equals exactly 1.


Special linear group

{title2=$C_n$}
{wiki}

= C sub n
{synonym}
{title2}


Cyclic group

{disambiguate=United States}

= Democrat
{synonym}
{title2}


Democratic Party

Democratic Party (United States)

Demographics of Brazil

Gallium compound

Media company

{wiki}

Canonical example: <Euclidean space>.


Metric space

{c}
{wiki}

Extract certain pages of a PDF:
``
pdftk input.pdf cat 2-4 output out1.pdf
``


Ciro Santilli @cirosantilli 37