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x = 4, y = 3, rule = B3/S23 2b2o$o2bo$3o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 3 ZOOM 21 HEIGHT 400 SUPPRESS ]] [[ ZOOM 63 ]]
Pattern type Induction coil
Number of cells 7
Bounding box 4 × 3
Discovered by Unknown
Year of discovery 1970

Bookend is generation 1 of century and an induction coil.

Many patterns that can be stabilized using bookends can also be stabilized using the smaller snake, but sufficiently long lines (for instance a line of 7) require using either this or the largely equivalent bun. An example appears in the champagne glass oscillator.

It can also be seen as a cis version of the eater 1. However, the pre-block terminal cannot function as eater 1.

While the bookend is also sometimes referred to as hook, this name is discouraged as to prevent confusion with the other still life component called hook.

Bookend-bookend still lifes

As mentioned previously, it can act as an induction coil. Two bookends suffice to make a still life, with five possible isomers:

There is a sixth still life with a physical connection between both bookends:

As a catalyst

The bookend can function as a catalyst when stabilized. Most commonly, a set of cis-mirrored bookends is used, which works when the pattern is symmetric; examples can be seen on that page. A single stabilized bookend can catalyze asymmetric patterns in various ways, such as in David Hilbert, CP semi-cenark and HLx111R. In addition, BTS is a useful catalyst that has a bookend (B) stabilized with a table (T) and a snake (S).

See also

External links