Haiku composition. Shiki's revisionism dealt a severe blow to renku and surviving haikai schools. The term "hokku" is now used chiefly in its original sense of the opening verse of a renku, and rarely to distinguish haiku written before Shiki's time. Haibun is a combination of prose and haiku, often autobiographical or written in the form of a travel journal. Haiga is a style of Japanese painting based on the aesthetics of haikai, and usually including a haiku. Today, haiga artists combine haiku with paintings, photographs and other art. The carving of famous haiku on natural stone to make poem monuments
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