Haiku matter. The loosening of traditional standards has resulted in the term "haiku" being applied to brief English-language poems such as "mathemaku" and other kinds of pseudohaiku. Some sources claim that this is justified by the blurring of definitional boundaries in Japan. Subsequent to Paul-Louis Couchoud’s popularisation of the form in France through his essays and translations, the next major haiku collection to appear there was the sequence of war poems by , "Cent visions de guerre" (1916). Later haiku by him were included among the work of the twelve published together in the "Nouvelle Revue Française" (No. 84, September 1920),
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