Haiku in English circular form (sometimes known as "cirku") whereby the poem has no fixed start or end point. In the "zip" form developed by John Carley, a haiku of 15 syllables is presented over two lines, each of which contains one internal caesura represented by a double space. A fixed-form 5-3-5 syllable (or 3-5-3 word) haiku is sometimes known as a "lune". The leading English-language haiku journals published in the U.S. include "Modern Haiku", "Frogpond" (published by the Haiku Society of America), "Mayfly" (founded by Randy and Shirley Brooks in 1986), "Acorn" (founded by A. C. Missias in 1998), "Bottle Rockets" (founded
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