Haiku stimulated the writing of haiku in English. The Japanese-American scholar and translator Kenneth Yasuda published "The Japanese Haiku: Its Essential Nature, History, and Possibilities in English, with Selected Examples" in 1957. The book includes both translations from Japanese and original poems of his own in English, which had previously appeared in his book titled "A Pepper-Pod: Classic Japanese Poems together with Original Haiku". In these books Yasuda presented a critical theory about haiku, to which he added comments on haiku poetry by early 20th-century poets and critics. His translations apply a 5–7–5 syllable count in English, with the first and
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