Haiku independently, were written in the context of renku. Shiki formally separated his new style of verse from the context of collaborative poetry. Being agnostic, he also separated it from the influence of Buddhism. Further, he discarded the term "hokku" and proposed the term "haiku" as an abbreviation of the phrase ""haikai no ku"" meaning a verse of "haikai", although the term predates Shiki by some two centuries, when it was used to mean "any" verse of haikai. Since then, "haiku" has been the term usually applied in both Japanese and English to all independent haiku, irrespective of their date of
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