Pippiann.

Brit.

/ˈpɪpɪən/, U.S.

/ˈpɪpiən/

Origin: Formed within English, by derivation. Etymons: P n., -ian suffix.

Etymology: < P n. (compare sense 2 at that entry) + -ipp-, arbitrary element (compare pip n.⁴) + -ian suffix, after Hessian n.²: see quot. 1857.

Mathematics. rare.

= Cayleyan adj. and n.

ΘΚΠ

the world > relative properties > number > geometry > curve > [adjective] > other

caustic1728

hypotrochoidal1843

hodographic1847

Pippian1857

tetrazomal1867

trizomal1867

three-bar1875

sinusoidal1878

1857 A. Cayley in Philos. Trans. (Royal Soc.) 147 415 I propose (in analogy with the form Hessian) to call the two curves in question [previously denoted by P and Q] the Pippian and Quippian respectively.

1889 Philos. Trans. 1888 (Royal Soc.) A. 179 166 This..is identically equal to − 4P (lx + my + nz), where P is the Pippian, or Cayleyan, of the cubic u.

1921 Proc. London Math. Soc. 20 101 Cayley..obtained two contravariants of the cubic curve..which he called respectively the ‘Pippian’ and the ‘Quippian’... Subsequent writers have to a large extent discarded the term ‘Pippian’ and use the name ‘Cayleyan’ instead.

This entry has been updated (OED Third Edition, June 2006; most recently modified version published online March 2022).

单词	pippian
释义	Pippiann. Brit. /ˈpɪpɪən/, U.S. /ˈpɪpiən/ Origin: Formed within English, by derivation. Etymons: P n., -ian suffix. Etymology: < P n. (compare sense 2 at that entry) + -ipp-, arbitrary element (compare pip n.⁴) + -ian suffix, after Hessian n.²: see quot. 1857. Mathematics. rare. = Cayleyan adj. and n. ΘΚΠ the world > relative properties > number > geometry > curve > [adjective] > other caustic1728 hypotrochoidal1843 hodographic1847 Pippian1857 tetrazomal1867 trizomal1867 three-bar1875 sinusoidal1878 1857 A. Cayley in Philos. Trans. (Royal Soc.) 147 415 I propose (in analogy with the form Hessian) to call the two curves in question [previously denoted by P and Q] the Pippian and Quippian respectively. 1889 Philos. Trans. 1888 (Royal Soc.) A. 179 166 This..is identically equal to − 4P (lx + my + nz), where P is the Pippian, or Cayleyan, of the cubic u. 1921 Proc. London Math. Soc. 20 101 Cayley..obtained two contravariants of the cubic curve..which he called respectively the ‘Pippian’ and the ‘Quippian’... Subsequent writers have to a large extent discarded the term ‘Pippian’ and use the name ‘Cayleyan’ instead. This entry has been updated (OED Third Edition, June 2006; most recently modified version published online March 2022). < n.1857
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