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An isomer is any of two or more objects each consisting of the same individual parts with different relative arrangements. These objects are distinguished using various affixes described below.

Cis- and trans-

The cis- prefix refers to the isomer in which the denser parts of each component are more "bunched together," while the trans- prefix refers to the isomer which is more "spread apart."

x = 15, y = 7, rule = B3/S23 2b2o9b2o$3bo10bo$o10bo$2o9b2o2$4o5b4o$o2bo5bo2bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART GPS 2 ]]
Cis-beacon on table (left) and trans-beacon on table (right)
(click above to open LifeViewer)
RLE: here Plaintext: here

Ortho- and para-

Ortho and para refer to the orientation of the object inducting the other object.

#C Cis, ortho, para, and trans carrier on tables, respectively. #C taken from the thread for basic questions. #C x = 25, y = 7, rule = B3/S23 b2o3b2o$2bo3bo9b2ob2o$o7bo5bo2bobo2bo$2o5b2o5b2o5b2o2$4o3b4o3b4o3b4o$o 2bo3bo2bo3bo2bo3bo2bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]]
Cis-carrier on table, Ortho-carrier on table,
Para-carrier on table, and Trans-carrier on table, in order.
(click above to open LifeViewer)
RLE: here Plaintext: here

"Up" and "down"

Isomers can be further distinguished with the up and down interfixes. Up refers to isomers in which one object "points" to the denser part of the other, while down means it points to the less dense part.

x = 16, y = 19, rule = B3/S23 3b2o9b2o$4bo10bo$bo10bo$b2o9b2o2$b4o5b4o$o3bo4bo3bo$2o7b2o4$3b2o9b2o$ 4bo10bo$bo10bo$b2o9b2o2$b4o5b4o$bo3bo4bo3bo$4b2o7b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART GPS 2 ]]
The four isomers of beacon on long bookend.
Top: Cis-beacon down and Trans-beacon down
Bottom: Cis-beacon up and Trans-beacon up
(click above to open LifeViewer)
RLE: here Plaintext: here

See also