Japanese poetry are a short, 3-line verse form, which have achieved significant global popularity, and the haiku form has been adapted from Japanese into other languages. Typical of the haiku form is the metrical pattern of 3 lines with a distribution of 5, 7, and 5 "on" (also known as morae) within those lines. Other features include the juxtaposition of two images or ideas with a "kireji" ("cutting word") between them, and a "kigo", or seasonal reference, usually drawn from a "saijiki", or traditional list of such words. Much of Japanese poetry has been transmitted historically through published anthologies, many of them
Invariant of a binary form for the ring of covariants. showed that the ring of invariants of a degree 8 form is generated by 9 invariants of degrees 2, 3, 4, 5, 6, 7, 8, 9, 10, and the ring of covariants is generated by 69 covariants. August von Gall () and confirmed the generators for the ring of invariants and showed that the ideal of relations between them is generated by elements of degrees 16, 17, 18, 19, 20. showed that the algebra of invariants of a degree 9 form is generated by 92 invariants. Cröni, Hagedorn, and Brouwer computed 476 covariants, and Lercier